Hello!
I am trying to figure out how to turn a perlin noise-type 3D terrain like this one:
int cols, rows;
int scl = 20; //scale
int w = 1200; //width, adjustable
int h = 900; //height, adjustable
float [][] z;
void setup() {
size(1600, 1100, P3D);
frameRate(60);
cols = w / scl;
rows = h / scl;
z = new float[cols][rows];
float yoff = 0; //small float offset for smooth changes in value
for (int y = 0; y < rows; y++) {
float xoff = 0;
for (int x = 0; x < cols; x++) {
z[x][y] = map(noise(xoff, yoff), 0, 1, -140, 140); //output of map(last numbers) controlled for height of mountains.
xoff += 0.2;//change offsets to control smoothness.
}
yoff +=0.2;
}
}
void draw() {
background(0);
stroke(255);
fill(111, 222, 55);
translate(width/2, height/2); //prepares to rotate everything relative to center of window
rotateX(radians(45));
translate(-w/2, -h/2); //offsets beginning of coordinates so that all of them appear in the screen.
//TRIANGLE_STRIP: LAND
for (int y = 0; y < rows-1; y++) {
beginShape(TRIANGLE_STRIP);
for (int x = 0; x < cols; x++) {
vertex(x*scl, y*scl, z[x][y]);
vertex(x*scl, (y+1)*scl, z[x][y+1]);
}
endShape();
}
}
…into a topographical map, that is, a 2D map (or a 3D map looked at directly from above) where altitude is indicated by different colors, and by CONTOUR LINES. I am actually more concerned about the Countour Lines than the colors.
Anyway, any help is appreciated. Thanks.
hope you’ll enjoy it!
hope you’ll enjoy it!
. I mistakenly said that the algorithm works pixel-wise. It actually divides the terrain into tiles of fixed sizes, and the boundaries are drawn using lines. For the image below, the tile size used is 2x2, with the default P3D smoothing setting. If you can find a way to join the isolines such that you can use the vertex() function, then you could perhaps get even nicer looking curves. It looks pretty descent right now though. I couldn’t tilt it anymore because the isolines in the background start to overlap isolines in the foreground. Perhaps you could also extract the points and create triangle strips with fill to avoid this problem.