Creating a small 3D model (House)

Processing Project Guidance
6

by the way:

in 3D mode (using P3D), the point 0,0,0 is in the upper left corner
(like in 2D) but the standard camera looks to a point right from there:

  • to width/2.0, height/2.0 and a Z-Position

You can see this here:

void setup() {
  size(1600, 900, P3D);
  background(20, 22, 254);
} // func 

void draw() {
  background(20, 22, 254);
  lights(); 

  sphereParams(0, 0, 0, 
    140);
}

void sphereParams(float x, float y, float z, 
  float sizeSphere) {
  // a sphere with parameters (the fill color must be set before calling the function; noStroke() is used in the function)
  pushMatrix();
  noStroke(); 
  translate(x, y, z);
  sphere(sizeSphere);
  popMatrix();
}
//

The sphere is in the upper left corner.

The standard camera has these default values :

camera(width/2.0, height/2.0, (height/2.0) / tan(PI*30.0 / 180.0),  // pos
width/2.0, height/2.0, 0,     // look at
0, 1, 0);                              // angle

Therefore in the “House Sketch” the cam is looking at
0, GROUND_LEVEL_Y-200, 0 which is the center of the scene.

Remark

Remember that in a 3D Sketch,

  • x is normal (left/right position)
  • but y is the virtual height above the scene and
  • Z is into the screen (away from you) (forward / backward position)

So to place something on the scene / stage we mainly change x and z (!), not so much y.

The idea of 3D space

The idea of 3D space (with size(1600, 900, P3D);) is that you draw not on a canvas but inside a box / room / stage where you can place stuff further away (away from you, into the screen depth, Z-value) or nearer to you.

Imagine the room as the space on a table where you place your scene:

The idea is that

  • the first parameter is x (you move something left and right on the table surface e.g.),
  • the 2nd parameter (y) is the height (you move something up and down above the table) and
  • the 3rd parameter (z) is that you move something back and forth on the table surface (depth).

The camera

The camera has 9 parameters: 3 for position, 3 for lookAt, 3 for UP vector.

Houses

See also houses Some Movies I made - #23 by Chrisir

Warm regards,

Chrisir

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