Problem with 3D and opacity

tlecoz

Hello !

I'm trying to build a simple 3D object from scratch but I have an issue with the opacity. It works with certain rotations but not for all , and I don't know how to get it work correctly.

I tryed to call 'beginShape' for each triangle but it didn't work (the result is the same)

Here is my code :

float rx = 0,ry = 0;

void setup(){
 size(1000,1000,P3D); 

}

void draw(){
  clear();
  background(255);



  pushMatrix();
  translate(width/2,height/2);

  pushMatrix();

  rotateX(rx);
  rotateY(ry);

  rx += PI/180;
  ry += PI/180;

  fill(255,0,0,50);
  stroke(0,100);

  beginShape(TRIANGLES);
  vertex(-100,-100,0);
  vertex(+100,-100,0);
  vertex(0   ,0   ,+100);

  vertex(+100,-100,0);
  vertex(+100,+100,0);
  vertex(0   ,0   ,+100);

  vertex(+100,+100,0);
  vertex(-100,+100,0);
  vertex(0   ,0   ,+100);

  vertex(-100,+100,0);
  vertex(-100,-100,0);
  vertex(0   ,0   ,+100);
  endShape();


  popMatrix();
  popMatrix();
}

Thanks !

tlecoz

I found the solution ! (in this post http://forum.processing.org/two/discussion/5898)

I just need to the line hint(DISABLE_DEPTH_TEST);

just before the "beginShape" call. And it works as expected !

I understood where was the problem but it's hard to explain, the discution in the link I give contains some explanations