Shaders displaced by the camera

[hamoid]

This is not necessarily a bug, but maybe just not mentioned in the documentation?

I'm trying to draw objects, apply a shader filter, then draw more objects. The effect of the shader spins around in a flat plane when moving the camera. How can I avoid having the filter effect move? I tried with state and with HUD...

Here an example (it needs blur.glsl from Examples > Topics > Shaders > BlurFilter)

import peasy.*;
PeasyCam cam;
PShader blur;

void setup() {
  size(1000, 800, P3D);  
  cam = new PeasyCam(this, 500);
  blur = loadShader("blur.glsl");
  noFill();
  stroke(255);
}

void draw() {
  background(40);
  for (int i=0; i<100; i++) {
    pushMatrix();
    rotateX(i*0.11);
    rotateY(i*0.21);
    translate(500, 0, 0);
    box(20);
    popMatrix();
  }

  cam.beginHUD();
  rect(10,10,width-20,height-20);
  filter(blur);
  cam.endHUD();

  box(200);
}

[hamoid]

Here you can see that the HUD keeps the border rectangle in place, but the blurred area is displaced down and to the left.

[jdf]

That sure looks to me like you're trying to apply a 2D effect to a 3D scene.

[hamoid]

Ok :) Does that mean I have to rewrite the shader so it works on 3D?

[jdf]

I'm closing because I don't believe this is related to PeasyCam.