Issues updating openGL old code to processing 3.0

bontempos

I am having a hard time trying to find references to put this to work on processing 3.0!!!

https://processing.org/discourse/beta/num_1273419930.html

In case anyone is experienced about these libraries I would be really glad!

koogs

which bit in particular? it's a 2d grid in 3d space.

raw opengl has been surpassed by the PShape functionality

look at createShape / beginShape in the reference.

bontempos

Ah, yes, thanks for your reply. I have made this before using createShape. But the whole process is dropping by frame rate considerably. This is why I wanted to try using any low level technique. My goal is to use a custom matrix as a camera transformation, but I can't find any updated example...

this is currently not working 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);
}

bontempos

By the way I finally could make the original code more likely.

still getting a GLException: Not a GL2 implementation

Got some old reference, but seems like this way of implementing is now obsolete. https://github.com/processing/processing/blob/e107f6dfb8e322a5edcc6ed751cb1ef952619fb8/build/shared/revisions.txt

import com.jogamp.opengl.*;  
import java.nio.FloatBuffer;

float[] modelview = { 
  0.670984f, 0.250691f, 0.674993f, 0, -0.288247f, 
  0.966749f, -0.137371f, 0f, -0.68315f, -0.0505059f, 0.720934f, 0f, 
  0.164808f, 2.1425f, 32.9616f, 1f };
float[] proj = { 
  0.78125f, 0, 0, 0, 0, 1.04167f, 0, 0, 0, 0, -1.0002f, -1, 0, 
  0, -2.0002f, 0 };

FloatBuffer  mvbuf;
FloatBuffer  projbuf;

void setup() {
  size(1024, 768, P3D);
  PJOGL.profile = 2; //not sure if needed
  mvbuf = FloatBuffer.wrap(modelview);
  projbuf= FloatBuffer.wrap(proj);

  GLProfile glp = GLProfile.get(GLProfile.GL2);
  GLCapabilitiesImmutable glcaps = (GLCapabilitiesImmutable) new GLCapabilities(glp);
  GLCapabilities tGLCapabilities = new GLCapabilities(glp);
  println("System Capabilities:" + glcaps.toString());
  println("Profile Details: " + glp.toString());
  println("Is GL2 Supported?: " + glp.isGL2());
}

void draw() {
  background(0);

  PGL pgl = (PJOGL) beginPGL(); 
  GL gl = ((PJOGL) pgl).gl; 
  GL2 gl2 = gl.getGL2(); //GLException: not a GL2 implemantation 

  gl2.glMatrixMode(GL2.GL_PROJECTION);
  gl2.glLoadIdentity();
  gl2.glLoadMatrixf(projbuf);

  gl2.glMatrixMode(GL2.GL_MODELVIEW);
  gl2.glLoadIdentity();
  gl2.glLoadMatrixf(mvbuf);

  drawGrid(100, 10, gl2);

  endPGL(); //not sure if this is closing what it supposed to
}


void drawGrid(float len, float offset, GL2 g) {

  int nr_lines = (int)(len/offset);

  g.glColor3f(1, 1, 1);
  g.glBegin(g.GL_LINES);
  for (int i=-nr_lines; i<nr_lines; i++) {

    g.glVertex3f(i*offset, 0, -nr_lines*offset);
    g.glVertex3f(i*offset, 0, nr_lines*offset);
  }

  for (int i=-nr_lines; i<nr_lines; i++) {

    g.glVertex3f(-nr_lines*offset, 0, i*offset);
    g.glVertex3f(nr_lines*offset, 0, i*offset);
  }
  g.glEnd();
}

bontempos

Please, any one who is familiar with opengl issues could give me a hand on this?

bontempos

After all this time I feel I can't get no one to assist me with these shaders or OpenGL issues in this forum.

kfrajer

In case you haven't done so, have you checked prev posts?

https://forum.processing.org/two/search?Search=getGL2

In your first code, are you trying to set up a camera angle?

There is a potential you can get feedback if you describe your issue better. From the link you provided:

projection and modelview matrices needed for an accurate projection of the scene onto a real world model . Based on the exported modelview and projection matrix, I would like to use Processing to create a nice scene

What are modelview matrices? What kind of world model are you referring to? I am guessing this is not your post but you ate familiar with that terminology? Maybe is it realted to shaders? From what I have seen in the forum, shaders assistance is limited, hit and miss.

Kf