issues Applying Camera Matrix

bontempos

I have a camera matrix extracted from another application. Currently, if I multiply a 3D point to this matrix, I get the 2D coords correspondent to where that point exists in camera projection plane.

I was trying to use "applyMatrix()" directly. BUT this is flattening everything, meaning object back faces and occluded faces becomes visible. Lights have no effect. stroke and fill get mixed.

PMatrix3D p; 

void setup() {
  size(600, 400, P3D);
}

void draw() {

  float x = map(mouseX, 0, width, -10, 10);
  float z = map(mouseY, 0, height, -10, 10);

 p = new PMatrix3D(
 5.400566, 0.519709, -4.3888016, 193.58757, 
 5.284709, -9.016302, 3.312224, 266.927, 
 0.012042404, 7.253584E-5, 0.0084899925, 1.0, 
 0, 0, 0, 1);

  applyMatrix(p);
  background(20);
  translate(x,0,z);
  fill(100);
  box(10);

}

second attempt was to apply transformation on PGraphicsOpenGL, but I still couldn't figure out how to do it properly.

PMatrix3D p; 

void setup() {
  size(600, 400, P3D);

  p = new PMatrix3D(
    5.400566, 0.519709, -4.3888016, 193.58757, 
    5.284709, -9.016302, 3.312224, 266.927, 
    0.012042404, 7.253584E-5, 0.0084899925, 1.0, 
    0, 0, 0, 1);

  p.invert();
}

void draw() {

  float x = map(mouseX, 0, width, -200, 200);
  float z = map(mouseY, 0, height, -150, 150);

  //((PGraphicsOpenGL) g).modelview.set(p);
  ((PGraphicsOpenGL) g).camera.set(p);
  //((PGraphicsOpenGL) g).projection.set(p);
  //((PGraphicsOpenGL) g).projmodelview.set(p);

  background(20);
  lights();
  translate(width/2, height/2);
  translate(x, 0, z);
  box(100);
}

from here: //https://github.com/processing/processing/issues/2904 I got the idea of making a shader but I have never done this before, so I am clueless so far...