.JAVA source file operating in processing

Tomabi · November 13, 2020, 5:16pm

Hello everyone,

I am a newbie Processing…

I wanna open a source file made by processing and that is based on JAVA.

Link: https://bitbucket.org/hues/fast-fluid-dynamics/src/master/

I’ve tried to operate this code, but I can not find how to use this file

The link also provides processing 1.5.1, However, how can I open the .java file in processing

“EDE…java is not a valid name for a sketch. Better to stick to ASCII, no spaces, and make sure
it doesn’t start with a number.”

And also, I tried the newest version processing (3.5.4.)

3.5.4.version can open the .java file but also occur

".java:23: error: The public type EDEMScFastFluidDynamics005 must be defined in its own file
public class EDEMScFastFluidDynamics005. extends PApplet {
^^^^^^^^^^^^^^^^^^^^^^^^^^
.java:23: error: Syntax error on token “.”, delete this token
public class EDEMScFastFluidDynamics005. extends PApplet {
^
.java:26: error: The method noLoop() is undefined for the type EDEMScFastFluidDynamics005
noLoop();
^^^^^^
.java:32: error: The method concat(String[], String[]) is undefined for the type EDEMScFastFluidDynamics005
PApplet.main(concat(appletArgs, passedArgs));
^^^^^^
4 problems (4 errors) "

Can someone save the newbie?

Perhaps I made a stupid mistake. Please forgive me generously…

Thank you guys

noel · November 13, 2020, 11:16pm

Hi @Tomabi Welcome to the forum.
Just to get you on the path I made the necessary changes to use the code with the recent core (3.5.4). Copy this code with the button that appears above the vertical scrollbar of this code box, and paste it in the Processing’s IDE. You will also have to install the libraries’ controlP5 and PeasyCam (Tools/add tools in IDE) Also, you need to study the examples of the controlP5 library to change some code related to the labels, etc. That part will be up to you. Overall the code is now working.
Edit: I had to post the code in two parts because it’s too large. Just paste them together in one sketch.

Part 1

// Original code copied from  https://bitbucket.org/hues/fast-fluid-dynamics/src/master/

import controlP5.ControlP5;
import controlP5.Controller;
import peasy.PeasyCam;



  ControlP5 cP5;
  PeasyCam cam;
  PGraphics3D g3;
  PMatrix3D currCamMatrix;
  PFont font;
  float [] BackgroundColor= new float [3];
  
  float FFD_btnVal1, FFD_btnVal2, FFD_btnVal3, FFD_btnVal4, FFD_btnVal5;
  int FFD_btnVal6, FFD_btnVal7, FFD_intXYZ;
  boolean FFD_tglVal1, FFD_tglVal2, FFD_tglVal3, FFD_tglVal4, FFD_tglVal5, FFD_tglVal6;
  boolean guiON =true;

  FFD ffd;
  int FFD_GridSizeX = 40;
  int FFD_GridSizeY = 40;
  int FFD_GridSizeZ = 30;
  int FFD_ScaleXYZ = 20;
  int FFD_ScaleArrows = 5;
  
  public void setup() {
    size(800,500,OPENGL);
    cam = new PeasyCam(this,150,300,150,800);
    cam.rotateX(-1.3f);
    cam.rotateZ(-0.0f);
    cam.rotateY(0.7f);
    cP5 = new ControlP5(this);
    g3 = (PGraphics3D)g;
    font = createFont("Calibri Bold Italic",20,true); 
    textFont(font);
    guiLoad(0);
    BackgroundColor[0] = 255;
    BackgroundColor[1] = 255;
    BackgroundColor[2] = 255;
    
    
    FFD_btnVal1 = 0.00000186f;
    FFD_btnVal2 = 0.0001f;
    FFD_btnVal3 = 0.2f;
    FFD_btnVal5 = 6f;
    FFD_btnVal7 =2;
    
    FFD_tglVal2 = true;
    
    
    ffd = new FFD(FFD_GridSizeX,FFD_GridSizeY,FFD_GridSizeZ);
//    ffd.addVelocity(1, 10, 0, 0);
//    ffd.addDye(1, 1);
  }

  public void draw() {
    background(BackgroundColor[0], BackgroundColor[1], BackgroundColor[2]);

    ffd.FluidRun();
    ffd.drawSectionColors(FFD_btnVal6, FFD_intXYZ);
    
    ffd.viscosity=FFD_btnVal1;
    ffd.diffusion=FFD_btnVal2;
    ffd.dt=FFD_btnVal3;
    ffd.densityIn = FFD_btnVal4;
    ffd.velocityIn = FFD_btnVal5;
    strokeWeight(1);
    noFill();
    pushMatrix();
    translate(((FFD_GridSizeX/2))*FFD_ScaleXYZ, ((FFD_GridSizeY/2))*FFD_ScaleXYZ, ((FFD_GridSizeZ/2))*FFD_ScaleXYZ);
    pushStyle();
    stroke(0);
    box(FFD_GridSizeX*FFD_ScaleXYZ, FFD_GridSizeY*FFD_ScaleXYZ, FFD_GridSizeZ*FFD_ScaleXYZ);
    popStyle();
    popMatrix();
    
    if (FFD_tglVal3 == true) ffd.drawAllIntBnd();
    //println("density " + ffd.density[btnVal7] + 
    //    " /// velocityX: " + ffd.Vx[btnVal7]+ " /// velocityY: " + ffd.Vy[btnVal7]+ " /// velocityZ: " + ffd.Vz[btnVal7]);
    
    if (guiON == true)  gui();
    else cam.setActive(true);

  }
  public void keyPressed(){  
    if (key == ' '){
      if (guiON == true){
        guiON = false;
      }else{
        guiON = true;  
      }
    }
    if (key == 'b' || key == 'B'){
      if(BackgroundColor[0] == 255){
        BackgroundColor[0] = 0;
        BackgroundColor[1] = 0;
        BackgroundColor[2] = 0;
      }else{
        BackgroundColor[0] = 255;
        BackgroundColor[1] = 255;
        BackgroundColor[2] = 255;
      }
    }
  }
  
  
  
  class FFD{

    int G1, G2, G3;    //grid size. not x,y,z, coz evrth being put into 1-dim array

    int nCells;      //number to know the total amount of cells in the grid
    int [] solid;    // solids for Finite Solid Method. the index of the cell, either 0 or 1, 0 being no solid, 1 being solid
    int [] solidx;
    int [] solidy;
    int [] solidz;
    int iter = 8;
    
    float dt;          //time step
    float diffusion;      //diffusion value
    float viscosity;      //viscosity value
    float densityIn;      //inflow density
    float velocityIn;      //inflow velocity
    float [] density;      //density [] value, per cell
    float [] densityScratch;  //density scratch []. scratch, so things can be changes. sth like a copy
    
    float []Vx;          //velocity [] in direction X
    float []Vy;          //velocity [] in direction Y
    float []Vz;          //velocity [] in direction Z
    float []Vx0;        //velocity  scratch [] in X
    float []Vy0;        //velocity  scratch [] in Y
    float []Vz0;        //velocity  scratch [] in Z
    
    
    float [] loads;        //loads per cell. only important, if it is a solid
    
    
    FFD(int GridSizeX, int GridSizeY, int GridSizeZ){
      G1 = GridSizeX;
      G2 = GridSizeY;
      G3 = GridSizeZ;
      
      int nCellsX, nCellsY, nCellsZ;
      nCellsX = G1;
      nCellsY = G2;
      nCellsZ = G3;
      nCells = nCellsX*nCellsY*nCellsZ;
      
      density = new float [nCells];
      densityScratch = new float [nCells];
      solid = new int [nCells];
      solidx = new int[nCells];
      solidy = new int[nCells];
      solidz = new int[nCells];
      Vx = new float [nCells];
      Vy = new float [nCells];
      Vz = new float [nCells];
      Vx0 = new float [nCells];
      Vy0 = new float [nCells];
      Vz0 = new float [nCells];
      
      loads = new float [nCells];
      
      for (int i=0; i<nCells; i++){
        Vx[i] = 0f;
        Vy[i] = 0f;
        Vz[i] = 0f;
        Vx0[i] = 0f;
        Vy0[i] = 0f;
        Vz0[i] = 0f;
        density[i] = 0.0f;
        densityScratch[i] = 0.0f;
        solid[i] = 0;
        solidx[i] = 0;
        solidy[i]=0;
        solidz[i] = 0;
        
        loads[i] = 0f;
      }
      
      for (int i=0; i<G1; i++){
        for (int j=0; j<G2; j++){
          for (int k=0; k<G3; k++){
            solidx[IndexCell(i,j,k)] = i;
            solidy[IndexCell(i,j,k)] = j;
            solidz[IndexCell(i,j,k)] = k;  
          }
        }
      }
      
    }
    
    void drawAllIntBnd(){
      int index;
      float col;
      PVector vec;
      pushStyle();
      for(int k=0; k<G3; k++){
        for (int j=0; j<G2; j++){
          for (int i=0; i<G1; i++){
            index = IndexCell(i,j,k);
            if (solid[index]==1){

              
              pushMatrix();
              translate(i*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              vec = new PVector(Vx[index], Vy[index], Vz[index]);
              col =vec.mag();
              loads[index] += vec.mag();  //no wrong... coz here,you lose the info, in which direction the vec is pointing.
              //println(Vz[index]);
              fill(abs(col)*1000);
              //println(abs(col)*1000);
              box(FFD_ScaleXYZ-1);
              
              //draw the vertex! to check the direction of the box. if it will move potentially
              //consider mass?
              popMatrix();              
            }

          }
        }
      }
      popStyle();
    }
      
    void drawSection(int xyzSection, int XYZcase){
      strokeWeight(2);      
      int index;
      
      switch (XYZcase){
      case 0:
        for(int k=0; k<G3; k++){
          for (int j=0; j<G2; j++){
            index = IndexCell(xyzSection,j,k);  
            if (FFD_tglVal1 == true){
              beginShape();
              vertex(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              vertex(xyzSection*FFD_ScaleXYZ+(Vx[index]*FFD_ScaleXYZ*FFD_ScaleArrows), 
                  j*FFD_ScaleXYZ+(Vy[index]*FFD_ScaleXYZ*FFD_ScaleArrows), 
                  k*FFD_ScaleXYZ+(Vz[index]*FFD_ScaleXYZ*FFD_ScaleArrows));
              endShape();
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      case 1:
        for(int k=0; k<G3; k++){
          for (int i=0; i<G1; i++){
            index = IndexCell(i, xyzSection, k);  
            if (FFD_tglVal1 == true){
              beginShape();
              vertex(i*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ, k*FFD_ScaleXYZ);
              vertex(i*FFD_ScaleXYZ+(Vx[index]*FFD_ScaleXYZ*FFD_ScaleArrows),
                  xyzSection*FFD_ScaleXYZ+(Vy[index]*FFD_ScaleXYZ*FFD_ScaleArrows),  
                  k*FFD_ScaleXYZ+(Vz[index]*FFD_ScaleXYZ*FFD_ScaleArrows));
              endShape();
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(i*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ, k*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(i*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ, k*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      case 2:
        for(int j=0; j<G2; j++){
          for (int i=0; i<G1; i++){
            index = IndexCell(i, j, xyzSection);  
            if (FFD_tglVal1 == true){
              beginShape();
              vertex(i*FFD_ScaleXYZ, j*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ);
              vertex(i*FFD_ScaleXYZ+(Vx[index]*FFD_ScaleXYZ*FFD_ScaleArrows),
                  j*FFD_ScaleXYZ+(Vy[index]*FFD_ScaleXYZ*FFD_ScaleArrows),
                  xyzSection*FFD_ScaleXYZ+(Vz[index]*FFD_ScaleXYZ*FFD_ScaleArrows));
              endShape();
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(i*FFD_ScaleXYZ, j*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(i*FFD_ScaleXYZ, j*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      }
      
    }


    void drawSectionColors(int xyzSection, int XYZcase){
      pushStyle();
      strokeWeight(1);      
      int index;
      colorMode(RGB,255);
      float RR, GG, BB;
      float Top, Low, Third;
      Top = 0.3f;
      Low = 0f;
      Third = (Top-Low)/5f;
      PVector vec;
      
      switch (XYZcase){
      case 0:
        for(int k=0; k<G3; k++){
          for (int j=0; j<G2; j++){
            index = IndexCell(xyzSection,j,k);  
            if (FFD_tglVal1 == true){
              vec = new PVector(Vx[index], Vy[index], Vz[index]);
              if (vec.mag() > Third && vec.mag() <= (2f*Third)){
                RR = (vec.mag()-Third) * (255f/Third);
                GG = 0f;
                BB = 255-((vec.mag()-Third) * (255f/Third));
              }else if(vec.mag() > (2f*Third)){
                RR = 255f;
                GG = ((vec.mag()-(2f*Third)) * (255f/Third));
                BB = 0f;
              }else {
                RR = 0f;
                GG = 0f;
                BB = 255f;
              }
              stroke(RR, GG, BB);
              pushMatrix();
              translate(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              beginShape(LINES);
              vertex(0,0,0);
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x, vec.y, vec.z+FFD_ScaleXYZ/5);
              
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x, vec.y, vec.z-FFD_ScaleXYZ/5);
              endShape();
              popMatrix();  
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(xyzSection*FFD_ScaleXYZ,j*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      case 1:
        for(int k=0; k<G3; k++){
          for (int i=0; i<G1; i++){
            index = IndexCell(i, xyzSection, k);  
            if (FFD_tglVal1 == true){
              vec = new PVector(Vx[index], Vy[index], Vz[index]);
              if (vec.mag() > Third && vec.mag() <= (2f*Third)){
                RR = (vec.mag()-Third) * (255f/Third);
                GG = 0f;
                BB = 255-((vec.mag()-Third) * (255f/Third));
              }else if(vec.mag() > (2f*Third)){
                RR = 255f;
                GG = ((vec.mag()-(2f*Third)) * (255f/Third));
                BB = 0f;
              }else {
                RR = 0f;
                GG = 0f;
                BB = 255f;
              }
              stroke(RR, GG, BB);
              pushMatrix();
              translate(i*FFD_ScaleXYZ,xyzSection*FFD_ScaleXYZ,k*FFD_ScaleXYZ);
              beginShape(LINES);
              vertex(0,0,0);
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x+FFD_ScaleXYZ/5, vec.y, vec.z);
              
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x-FFD_ScaleXYZ/5, vec.y, vec.z);
              endShape();
              popMatrix();
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(i*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ, k*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(i*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ, k*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      case 2:
        for(int j=0; j<G2; j++){
          for (int i=0; i<G1; i++){
            index = IndexCell(i, j, xyzSection);  
            if (FFD_tglVal1 == true){
              vec = new PVector(Vx[index], Vy[index], Vz[index]);
              if (vec.mag() > Third && vec.mag() <= (2f*Third)){
                RR = (vec.mag()-Third) * (255f/Third);
                GG = 0f;
                BB = 255-((vec.mag()-Third) * (255f/Third));
              }else if(vec.mag() > (2f*Third)){
                RR = 255f;
                GG = ((vec.mag()-(2f*Third)) * (255f/Third));
                BB = 0f;
              }else {
                RR = 0f;
                GG = 0f;
                BB = 255f;
              }
              stroke(RR, GG, BB);
              pushMatrix();
              translate(i*FFD_ScaleXYZ,j*FFD_ScaleXYZ,xyzSection*FFD_ScaleXYZ);
              beginShape(LINES);
              vertex(0,0,0);
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x, vec.y+FFD_ScaleXYZ/5, vec.z);
              
              vec.normalize();
              vec.mult(FFD_ScaleXYZ);
              vertex(vec.x, vec.y, vec.z);
              vec.div(1.5f);
              vertex(vec.x, vec.y-FFD_ScaleXYZ/5, vec.z);
              endShape();
              popMatrix();
            }
            if (FFD_tglVal2 == true){
              noFill();
              pushMatrix();
              translate(i*FFD_ScaleXYZ, j*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ);
              box(density[index]);
              popMatrix();
            }
            if (FFD_tglVal3 == true){
              if (solid[index] == 1){
                fill(0,80);
                pushMatrix();
                translate(i*FFD_ScaleXYZ, j*FFD_ScaleXYZ, xyzSection*FFD_ScaleXYZ);
                box(FFD_ScaleXYZ-1);
                popMatrix();
              }            
            }
          }  
        }
        break;
      }
      popStyle();
    }
  
    
    void FluidRun(){
      
      addInternalBoundary();
      addWind();
      OpDiffuse(1, Vx0, Vx, viscosity, dt, iter);
      OpDiffuse(2, Vy0, Vy, viscosity, dt, iter);
      OpDiffuse(3, Vz0, Vz, viscosity, dt, iter);
      
      OpProject(Vx0, Vy0, Vz0, Vx, Vy, iter);
      
      OpAdvect(1, Vx, Vx0, Vx0, Vy0, Vz0, dt);
      OpAdvect(2, Vy, Vy0, Vx0, Vy0, Vz0, dt);
      OpAdvect(3, Vz, Vz0, Vx0, Vy0, Vz0, dt);
      
      OpProject(Vx, Vy, Vz, Vx0, Vy0, iter);
      
      OpDiffuse(0, densityScratch, density, diffusion, dt, iter);
      OpAdvect(0, density, densityScratch, Vx, Vy, Vz, dt);
      
      //OpLoads();
      OpForce();
    }
    
    void reset(){
      for (int i=0; i<nCells; i++){
        Vx[i] = 0f;
        Vy[i] = 0f;
        Vz[i] = 0f;
        Vx0[i] = 0f;
        Vy0[i] = 0f;
        Vz0[i] = 0f;
        density[i] = 0.0f;
        densityScratch[i] = 0.0f;
        solid[i] = 0;
        
        loads[i] = 0f;
      }
    }
    
    void addDye(int x, int y, int z, float amount){
      density[IndexCell(x,y,z)] += amount;
    }
    
    void addVelocity(int x, int y, int z, float VxAdd, float VyAdd, float VzAdd){
      int index = IndexCell(x,y,z);
      Vx[index] += VxAdd;
      Vy[index] += VyAdd;
      Vz[index] += VzAdd;
    }
    
    void addWind(){
//      for(int i=((G1/2)-2); i<((G1/2)+2); i++){
//        for (int k=0; k<G3-1; k++){
//          
//          addDye(i,1,k,densityIn);
//          addVelocity(i,1,k,0.0f, velocityIn, 0.0f);
//        }
//      }
      
//      for(int i=((G1/2)-2); i<((G1/2)+2); i++){
//        for (int j=((G2/2)-2); j<((G2/2)+2); j++){
//          
//          addDye(i,j,1,densityIn);
//          addVelocity(i,j,1, 0.0f, 0.0f,velocityIn);
//        }
//      }
      
      for(int i=((G1/2)-2); i<((G1/2)+2); i++){
        for (int j=((G2/2)-2); j<((G2/2)+2); j++){
          
          addDye(i,j,1,densityIn);
          addVelocity(i,j,1, 0.0f, 0.0f,velocityIn);
        }
      }
      
    }
    
    void addInternalBoundary(){
      
      for (int i=0; i<G1; i++){
        for (int j=0; j<G2; j++){
          solid[IndexCell(i,j,G3/2)] =0;
        }
      }
      
      for (int i=((G1/2)-(FFD_btnVal7/2));i<((G1/2)+(FFD_btnVal7/2)); i++){
        for (int j=((G2/2)-(FFD_btnVal7/2)); j<((G2/2)+(FFD_btnVal7/2)); j++){
          solid[IndexCell(i,j,G3/2)]=1;                        
        }
      }
      
      
    }
    
    void OpForce(){
      
      PVector normal;
      PVector vectorAdd;
      float [] VxBuff = new float [Vx.length];
      float [] VyBuff = new float [Vy.length];
      float [] VzBuff = new float [Vz.length];
      int a = 1;
      
      for (int m=0; m<solid.length; m++){
        if (solid[m] == 1){
          VxBuff[m] = 0;
          VyBuff[m] = 0;
          VzBuff[m] = 0;
          if (solidx[m]>1){
            normal = new PVector (-1,0,0);
            vectorAdd = weightedVector(solidx[m]-a, solidy[m], solidz[m], normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
          if (solidx[m]<G1-1){
            normal = new PVector (1,0,0);
            vectorAdd = weightedVector(solidx[m]+a, solidy[m], solidz[m], normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
          if (solidy[m]>1){
            normal = new PVector (0,-1,0);
            vectorAdd = weightedVector(solidx[m], solidy[m]-a, solidz[m], normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
          if (solidy[m]<G2-1){
            normal = new PVector (0,1,0);
            vectorAdd = weightedVector(solidx[m], solidy[m]+a, solidz[m], normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
          if (solidz[m]>1){
            normal = new PVector (0,0,-1);
            vectorAdd = weightedVector(solidx[m], solidy[m], solidz[m]-a, normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
          if (solidy[m]<G3-1){
            normal = new PVector (0,0,1);
            vectorAdd = weightedVector(solidx[m], solidy[m], solidz[m]+a, normal);
            VxBuff[m] += vectorAdd.x;
            VyBuff[m] += vectorAdd.y;
            VzBuff[m] += vectorAdd.z;
          }
        }
      }
      
      for (int m=0; m<solid.length; m++){
        if (solid[m] == 1){
          Vx[m] = VxBuff[m];
          Vy[m] = VyBuff[m];
          Vz[m] = VzBuff[m];
        }
      }
      
      
      
    }
    
    PVector weightedVector(int x, int y, int z, PVector normal){
      int ix;
      float angle;
      float vectorWeight;
      PVector fluid, vectorAdd;
      
      ix = IndexCell(x, y, z);

      fluid = new PVector (Vx[ix], Vy[ix], Vz[ix]);
      angle = PVector.angleBetween(normal, fluid);
      angle = degrees(angle);
      
      vectorWeight= angle<=90f ? 1f-((1f/90f)*angle) : (1f/90f)*(angle-90f);
    
      //println(angle + " " + fluid.mag() + " " + vectorWeight);
      vectorAdd = PVector.mult(fluid, vectorWeight);
      if (vectorAdd.mag() > 0){
        //println("hi");
      }else{
        vectorAdd = new PVector(0,0,0);
      }
      return vectorAdd;
    }

noel · November 13, 2020, 11:17pm

Part 2

void OpDiffuse(int b, float []cell, float []cell0, float diff, float dt, int iter){
      float a;
      if (b==1)     a = dt * diff * (G2 - 2) * (G3 - 2);
      else if(b==2)  a = dt * diff * (G1 - 2) * (G3 - 2);
      else if(b==3)  a = dt * diff * (G1 - 2) * (G2 - 2);
      else      a = dt * diff * (G1 - 2) * (G2 - 2);
      LinearSolver(b, cell, cell0, a, 1+6*a, iter);
    }
    
    void OpProject(float []velocX, float []velocY, float []velocZ, float []p, float []div, int iter){
      
      int [] ic = new int [6];
    
      for (int k=1; k<G3-1; k++){
        for (int j=1; j<G2-1; j++){
          for (int i=1; i<G1-1; i++){
            if (solid[IndexCell(i,j,k)]==0){
              ic[0] = IndexCell(i+1, j, k);
              ic[1] = IndexCell(i-1, j, k);
              ic[2] = IndexCell(i, j+1, k);
              ic[3] = IndexCell(i, j-1, k);
              ic[4] = IndexCell(i, j, k+1);
              ic[5] = IndexCell(i, j, k-1);
              for (int cc = 0; cc<5; cc++){
                if (solid[ic[cc]]==1) ic[cc] = IndexCell(i,j,k); 
              }
              div[IndexCell(i,j,k)] = -0.5f*(
                        velocX[ic[0]] -
                        velocX[ic[1]] +
                        velocY[ic[2]] -
                        velocY[ic[3]] +
                        velocZ[ic[4]] -
                        velocZ[ic[5]]
                        ) /G1;
              p[IndexCell(i,j,k)] = 0;
            }
          }
        }
      }
      Boundary(0, div);
      Boundary(0, p);
      LinearSolver(0,p,div,1,6,iter);
      
      for (int k=1; k<G3-1; k++){
        for(int j=1; j<G2-1; j++){
          for(int i=1; i<G1-1; i++){
            if (solid[IndexCell(i,j,k)]==0){
              ic[0] = IndexCell(i+1, j, k);
              ic[1] = IndexCell(i-1, j, k);
              ic[2] = IndexCell(i, j+1, k);
              ic[3] = IndexCell(i, j-1, k);
              ic[4] = IndexCell(i, j, k+1);
              ic[5] = IndexCell(i, j, k-1);
              for (int cc = 0; cc<5; cc++){
                if (solid[ic[cc]]==1) ic[cc] = IndexCell(i,j,k); 
              }
              velocX[IndexCell(i,j,k)] -= 0.5f * (p[ic[0]] -
                                p[ic[1]]) * G1;
              velocY[IndexCell(i,j,k)] -= 0.5f * (p[ic[2]] -
                                p[ic[3]]) * G2;
              velocZ[IndexCell(i,j,k)] -= 0.5f * (p[ic[4]] -
                                p[ic[5]]) * G3;
            }
          }
        }
      }
      Boundary(1,velocX);
      Boundary(2,velocY);
      Boundary(3,velocZ);
      
    }
    
    void OpAdvect(int b, float []d, float []d0, float []velocX, float []velocY, float []velocZ, float dt){
      float i0, i1, j0, j1, k0, k1;
      float dtx = dt*(G1-2);
      float dty = dt*(G2-2);
      float dtz = dt*(G3-2);
      float s0,s1,t0,t1,u0,u1;
      float tmp1,tmp2,tmp3,x,y,z;
      float G1float = G1;
      float G2float = G2;
      float G3float = G3;
      float ifloat, jfloat, kfloat;
      int i,j,k;
      
      for(k=1, kfloat=1f; k<G3-1; k++, kfloat++){
        for(j=1, jfloat=1f; j<G2-1; j++, jfloat++){
          for(i=1, ifloat=1f; i<G1-1; i++, ifloat++){
            if(solid[IndexCell(i,j,k)]==0){
              tmp1=dtx*velocX[IndexCell(i,j,k)];
              tmp2=dty*velocY[IndexCell(i,j,k)];
              tmp3=dtz*velocZ[IndexCell(i,j,k)];
              x=ifloat-tmp1;
              y=jfloat-tmp2;
              z=kfloat-tmp3;
              
              if(x<0.5f) x=0.5f;
              if(x>G1float-1.5f) x=G1float-1.5f;
              i0=floor(x);
              i1=i0+1.0f;
              if(y<0.5f) y=0.5f;
              if(y>G2float-1.5f) y=G2float-1.5f;
              j0=floor(y);
              j1=j0+1.0f;
              if(z<0.5f) z=0.5f;
              if(z>G3float-1.5f) z=G3float-1.5f;
              k0=floor(z);
              k1=k0+1.0f;
              
              s1=x-i0;
              s0=1.0f-s1;
              t1=y-j0;
              t0=1.0f-t1;
              u1=z-k0;
              u0=1.0f-u1;
              
              int i0i = (int)i0;
              int i1i = (int)i1;
              int j0i = (int)j0;
              int j1i = (int)j1;
              int k0i = (int)k0;
              int k1i = (int)k1;
              
              d[IndexCell(i,j,k)] =
                  s0 * (t0 *  (u0 * d0[IndexCell(i0i,j0i,k0i)]
                        +u1 * d0[IndexCell(i0i, j0i, k1i)])
                    +(t1 *  (u0 * d0[IndexCell(i0i, j1i, k0i)]
                        +u1 * d0[IndexCell(i0i, j1i, k1i)])))
                +  s1 * (t0 *  (u0 * d0[IndexCell(i1i,j0i,k0i)]
                        +u1 * d0[IndexCell(i1i, j0i, k1i)])
                    +(t1 *  (u0 * d0[IndexCell(i1i, j1i, k0i)]
                        +u1 * d0[IndexCell(i1i, j1i, k1i)])));
            }
          }
        }
      }
      Boundary(b,d);
    }
    
    void Boundary(int b, float []cell){
      for(int j=1; j<G2-1; j++){
        for(int i=1; i<G1-1; i++){
          cell[IndexCell(i,j,0)] = b == 3 ? -cell[IndexCell(i,j,1)] : cell[IndexCell(i,j,1)];
          cell[IndexCell(i,j,G3-1)] = b == 3 ? -cell[IndexCell(i,j,G3-2)] : cell[IndexCell(i,j,G3-2)];
        }
      }
      
      for(int k=1; k<G3-1; k++){
        for(int i=1; i<G1-1; i++){
          cell[IndexCell(i,0,k)] = b == 2 ? -cell[IndexCell(i,1,k)] : cell[IndexCell(i,1,k)];
          cell[IndexCell(i,G2-1,k)] = b == 2 ? -cell[IndexCell(i,G2-2,k)] : cell[IndexCell(i,G2-2,k)];
        }
      }
      
      for(int k=1; k<G3-1; k++){
        for(int j=1; j<G2-1; j++){
          cell[IndexCell(0,j,k)] = b == 1 ? -cell[IndexCell(1,j,k)] : cell[IndexCell(1,j,k)];
          cell[IndexCell(G1-1,j,k)] = b == 1 ? -cell[IndexCell(G1-2,j,k)] : cell[IndexCell(G1-2,j,k)];
        }
      }
      
      
      //first bottom row, first corner
      cell[IndexCell(0,0,0)]    =  0.33f  *  (cell[IndexCell(1,0,0)] + 
                            cell[IndexCell(0,1,0)] + 
                            cell[IndexCell(0,0,1)]);
      //first bottom row, second corner
      cell[IndexCell(0,G2-1,0)]  =  0.33f  *   (cell[IndexCell(1,G2-1,0)] + 
                            cell[IndexCell(0,G2-2,0)] + 
                            cell[IndexCell(0,G2-1,1)]);
      //first top row, first corner
      cell[IndexCell(0,0,G3-1)]  =  0.33f  *   (cell[IndexCell(1,0,G3-1)] + 
                            cell[IndexCell(0,1,G3-1)] + 
                            cell[IndexCell(0,0,G3-2)]);
      //first top row, second corner
      cell[IndexCell(0,G2-1,G3-1)]=  0.33f  *  (cell[IndexCell(1,G2-1,G3-1)] +
                            cell[IndexCell(0,G2-2,G3-1)] +
                            cell[IndexCell(0,G2-1,G3-2)]);
      //last bottom row, first corner
      cell[IndexCell(G1-1,0,0)]  =  0.33f  *  (cell[IndexCell(G1-2,0,0)] +
                            cell[IndexCell(G1-1,1,0)] +
                            cell[IndexCell(G1-1,0,1)]);
      //last bottom row, second corner
      cell[IndexCell(G1-1,G2-1,0)]=  0.33f  *  (cell[IndexCell(G1-2,G1-1,0)] +
                            cell[IndexCell(G1-1,G2-2,0)] +
                            cell[IndexCell(G1-1,G2-1,1)]);
      //last top row, first corner
      cell[IndexCell(G1-1,0,G3-1)]=  0.33f  *  (cell[IndexCell(G1-2,0,G3-1)] +
                            cell[IndexCell(G1-1,1,G3-1)] +
                            cell[IndexCell(G1-1,0,G3-2)]);
      //last top row, second corner
      cell[IndexCell(G1-1,G2-1,G3-1)]=0.33f  *  (cell[IndexCell(G1-2,G2-1,G3-1)] +
                            cell[IndexCell(G1-1,G2-2,G3-1)] +
                            cell[IndexCell(G1-1,G2-1,G3-2)]);
      
      BoundaryInternal(b, cell);
    }
    
    void BoundaryInternal(int b, float [] cell){
      int index;
      for (int m=0; m<solid.length; m++){
        if (solid[m]==1){
        switch(b)
        {
        case 1:
          if (solidx[m]>0){
            index =IndexCell(solidx[m]-1, solidy[m], solidz[m]);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          if (solidx[m]<G1){
            index=IndexCell(solidx[m]+1, solidy[m], solidz[m]);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          break;
        case 2:
          if (solidy[m] > 0){
            index = IndexCell(solidx[m], solidy[m]-1, solidz[m]);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          if(solidy[m] < G2){
            index = IndexCell(solidx[m], solidy[m]+1, solidz[m]);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          break;
        case 3:
          if (solidz[m] > 0){
            index = IndexCell(solidx[m],solidy[m],solidz[m]-1);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          if (solidz[m] < G3){
            index = IndexCell(solidx[m],solidy[m],solidz[m]+1);
            if (solid[index]==0)  cell[index] = -cell[index];
          }
          break;
        }
          
        cell[IndexCell(solidx[m], solidy[m], solidz[m])] = 0f;
        }
      }
    }
      
    void LinearSolver(int b, float []cell, float []cell0, float a, float c, int iter){
      int [] ic = new int [6];
      
      float cRecip =1.0f / c;
      for (int m=0; m<iter; m++){
        for(int k=1; k<G3-1; k++){
          for(int j=1; j<G2-1; j++){
            for(int i=1; i<G1-1; i++){
              if (solid[IndexCell(i,j,k)] == 0){
                ic[0] = IndexCell(i+1, j, k);
                ic[1] = IndexCell(i-1, j, k);
                ic[2] = IndexCell(i, j+1, k);
                ic[3] = IndexCell(i, j-1, k);
                ic[4] = IndexCell(i, j, k+1);
                ic[5] = IndexCell(i, j, k-1);
                for (int cc = 0; cc<5; cc++){
                  if (solid[ic[cc]]==1) ic[cc] = IndexCell(i,j,k); 
                }
                cell[IndexCell(i,j,k)] = 
                    (cell0[IndexCell(i,j,k)] +  a*
                                  (cell[ic[0]] +
                                  cell[ic[1]] +
                                  cell[ic[2]] +
                                  cell[ic[3]] +
                                  cell[ic[4]] +
                                  cell[ic[5]]
                                  )) * cRecip;                
              }
            }
          }
        }
        Boundary(b, cell);
      }
    }
      
    int IndexCell(int x, int y, int z){
      return (x) + (y* (G1)) + (z* (G2)*(G1)); 
    }
  
  }
  
  

  
  public void gui(){
    
    currCamMatrix = new PMatrix3D(g3.camera);
    camera();
    pushStyle();
    
    strokeWeight(2);
    stroke(0);
    fill(0);
    text("FAST FLUID DYNAMICS", width/2-80, 30);
    font = createFont("Calibri Bold Italic",10,true); 
    textFont(font);
    text("V.005 // 16th Aug. 2012", width/2-80, 40);
    text("based on Jos Stam's Stable Fluids", width/2-80, 50);
    text("& Mike Ash's Fluid Simulation for Dummies", width/2-80, 60);


    fill(0,0,255,120);
    noStroke();
    rect(0,0,width,90);
    
    
    if (guiON == true){
      if (mouseY < 90) cam.setActive(false);
      else cam.setActive(true);      
    }
    
    cP5.draw();
    g3.camera = currCamMatrix;
    popStyle();
    
  }
  public void guiLoad(int XYZ){
    //cP5.setColorLabel(0);
    cP5.addSlider("Viscosity",   0,  0.01f,  10,  10,  180,  7);
    cP5.addSlider("Diffusion",   0,  0.01f,  10,  20,  180,  7);
    cP5.addSlider("Dt",     0,  2,    10,  30,  180,  7);
    cP5.addSlider("DensityIn",   0,  5,    10,  40,  180,  7);
    cP5.addSlider("VelocityIn", 0,  50,    10,  50,  180,  7);    
    
    switch (XYZ){
    case 0:
      cP5.addSlider("SectionXYZ", 0, FFD_GridSizeX-1, 10,60,180,7);
      cP5.addToggle("SectionX", true, width-250, 30, 20, 7);
      cP5.addToggle("SectionY", false, width-250, 50, 20, 7);
      cP5.addToggle("SectionZ", false, width-250, 70, 20, 7);
      FFD_btnVal6 = 0;
      FFD_intXYZ = 0;
      break;
    case 1:
      cP5.addSlider("SectionXYZ", 0, FFD_GridSizeY-1, 10,60,180,7);
      cP5.addToggle("SectionX", false, width-250, 30, 20, 7);
      cP5.addToggle("SectionY", true, width-250, 50, 20, 7);
      cP5.addToggle("SectionZ", false, width-250, 70, 20, 7);
      FFD_btnVal6 = 0;
      FFD_intXYZ = 1;
      break;
    case 2:
      cP5.addSlider("SectionXYZ", 0, FFD_GridSizeZ-1, 10,60,180,7);
      cP5.addToggle("SectionX", false, width-250, 30, 20, 7);
      cP5.addToggle("SectionY", false, width-250, 50, 20, 7);
      cP5.addToggle("SectionZ", true, width-250, 70, 20, 7);
      FFD_btnVal6 = 0;
      FFD_intXYZ = 2;
      break;
    }
    
    if (FFD_GridSizeY > FFD_GridSizeX) cP5.addSlider("IntBoundary", 1, FFD_GridSizeY-1, 10,70,180,7);
    else cP5.addSlider("IntBoundary", 1, FFD_GridSizeX-1, 10,70,180,7);
    cP5.addToggle("Obstacle", false, width-250, 10, 20, 7);
    
    cP5.addToggle("VelocityArrows", false, width-170, 30, 20, 7);
    

    cP5.addToggle("DensityCubes", false, width-90, 30, 20, 7);
    
    cP5.setAutoDraw(false);  
  }
  
  public void Viscosity(float val) {
    FFD_btnVal1 = val;
  }
  public void Diffusion(float val) {
    FFD_btnVal2 = val;
  }

  
  public void Dt(float val) {
    FFD_btnVal3 = val;
  }
  public void DensityIn(float val) {
    FFD_btnVal4 = val;
  }
  public void VelocityIn(float val) {
    FFD_btnVal5 = val;
  }
  public void SectionXYZ(int val){
    FFD_btnVal6 = val;
  }
  public void IntBoundary(int val){
    FFD_btnVal7 = val;
  }
  
  public void VelocityArrows(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal1 = true;
    } else {
      FFD_tglVal1 = false;
    }
  }
  public void DensityCubes(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal2 = true;
    } else {
      FFD_tglVal2 = false;
    }
  }
  public void Obstacle(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal3 = true;
    } else {
      FFD_tglVal3 = false;
    }
  }
  public void SectionX(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal4 = true;
      FFD_tglVal5 = false;
      FFD_tglVal6 = false;
      guiLoad(0);
    } else {
      FFD_tglVal4 = false;
      FFD_tglVal5 = true;
      FFD_tglVal6 = true;
    }
  }
  public void SectionY(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal5 = true;
      FFD_tglVal4 = false;
      FFD_tglVal6 = false;
      guiLoad(1);
    } else {
      FFD_tglVal5 = false;
      FFD_tglVal4 = true;
      FFD_tglVal6 = true;
    }
  }
  public void SectionZ(boolean theFlag) {
    if(theFlag==true) {
      FFD_tglVal6 = true;
      FFD_tglVal5 = false;
      FFD_tglVal4 = false;
      guiLoad(2);
    } else {
      FFD_tglVal6 = false;
      FFD_tglVal5 = true;
      FFD_tglVal4 = true;
    }
  }

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