When I move the cam and have lights on, the color of my object will change significant until the cam stops moving. Is this a bug of the library?

I don't think so. I noticed the same problem and it seems that the relative positions of the object being illuminated and the light are constant i.e. PeasyCam rotates both the object and directional lights.

I assume the effect you want is to rotate the object without changing the light direction. If this is the case then

Code:

// Declare a variable for camera matrix
PMatrix3D baseMat;

void setup(){
  size(400, 400, OPENGL);
  baseMat = g.getMatrix(baseMat);

  pCamera = new PeasyCam(this, 300);
  pCamera.lookAt(0, 0, 0, 110);

  // etc.
}

void draw(){
  background(20);
  // Save PeasyCam matrix and reset original
  pushMatrix();
  g.setMatrix(baseMat);
  // stage lighting
  directionalLight(200, 200, 200, 100, 150, -100);
  ambientLight(160, 160, 160);
  // restore PeasyCam matrix
  popMatrix();
  
  // draw objects

} 

was a solution I came up with some time ago, there may be better ones now.

Peasycam only moves the camera. If you are only lighting your world from one side, then, as you move the camera, you will expose the dark side of your model. The changing "color" you see is I'm guessing some artifact of diffuse shading?

Hello,

I had a similar problem (until the moment I switched to processing version 1.09 and then from P3D to OPENGL and my program has stopped working at all     ).

Till then I had the following problem:

I used beginHUD and the changing light was not only on the object (which I find ok) but also on the HUD, which is bad since the HUD should not be part of the scene.
The HUD should provide textual output or buttons or whatever which should have a constant light when turning the scenery behind it.

Thanks!

Greetings!

Chrisir