Hi,

I may be doing something wrong here, but I can't get the perspective() function to work after more than one call using OPENGL in the setup method.


This code works brilliantly (from the website examples), but replacing the "P3D" in the size() function with "OPENGL" breaks it (I see nothing drawn onscreen).  Looking at it further, it seems that the 1st call to perspective works fine, but successive calls result in a blank screen with only the background color.  Does anyone have any advice, or is this a limitation of Processing?


import processing.opengl.*;

void setup() {
 size(400, 400, P3D);
 background(204, 204, 204);
 noStroke();
 frameRate(30);  // set the frame rate
}

void draw()
{
 
 float ctr = 0;
 
 lights();
 background(204);
 float cameraY = height*0.5;
 float fov = (mouseY/float(height) + 0.25) * PI/2;
 float cameraZ = cameraY / tan(fov * 0.5);
 float aspect = float(width)/float(height);
 if(mousePressed) {
   println(fov);
 }
 perspective(fov, aspect, cameraZ*0.1, cameraZ*10.0);
 
 translate(0,40,0);
 
 for (ctr=0; ctr <= 25; ctr++)
 {
   box(width*0.025, 200, 20);
   translate(4.0*width*0.01, 0, 0);
 }
}