Processing 193 and GLGraphics

Core Library Questions

guess

Processing 193 and GLGraphics

in Core Library Questions • 2 years ago

Hello,

Would someone know how to transition from GLGraphics (especially the Model class) to the new openGL2 idiom?

Repurposing the MillionCubes example would be a great help.

Thanks a lot !
Jeff

Replies(8)

andres

Re: Processing 193 and GLGraphics

2 years ago

You could use shape recording to draw with the standard API and have the resulting geometry stored in a PShape3D (the equivalent of GLModel):

import processing.opengl2.*;
PShape cubes;
void setup() {
size(400, 400, OPENGL2);
noStroke();
mergeShapes(true);
cubes = beginRecord();
for (int i = 0; i < 10000; i++) {
float x = random(-width/2, width/2);
float y = random(-height/2, height/2);
float z = random(-200, 200);
fill(random(0, 255), random(0, 255), random(0, 255), 50);
beginShape(QUADS);
vertex(x - 10, y - 10, z);
vertex(x + 10, y - 10, z);
vertex(x + 10, y + 10, z);
vertex(x - 10, y + 10, z);
endShape();
}
endRecord();
}
void draw() {
background(0);
translate(width/2, height/2);
rotateX(frameCount * 0.01);
rotateY(frameCount * 0.02);
shape(cubes);
}

guess

Re: Processing 193 and GLGraphics

2 years ago

Thank you again Andres!

This approach looks really exciting, interesting and clear.

Does OPENGL2 speed up previous GLGraphics code?

Jeff

andres

Re: Processing 193 and GLGraphics

2 years ago

You mean if it is possible to use GLGraphics with the OPENGL2 renderer?

guess

Re: Processing 193 and GLGraphics

2 years ago

No changing from the GLConstants.GLGRAPHICS renderer to OPENGL2.
Or maybe it is the same thing?

andres

Re: Processing 193 and GLGraphics

2 years ago

No, you cannot mix GLGraphics and OPENGL2, at least not yet.

GLGraphics needs to be re-written in order to work on top of OPENGL2.

guess

Re: Processing 193 and GLGraphics

1 year ago

I'm revisiting an old project and was wondering how to take advantage of Processing 2.0a1 to make the MillionCubes example work. Is there a simpler GModel equivalent now? PShape?

Thanks again!
Jeff

andres

Re: Processing 193 and GLGraphics

1 year ago

Yes, PShape is the equivalent of GLModel. Take a look at the Demos/Performance/CubicGridRetained example to see how to use PShape objects to create large meshes.

guess

Re: Processing 193 and GLGraphics

1 year ago

Thanks for your response. I hadn't seen that example! But in the meantime I'd more or less came up with a very similar solution! PShape makes it a lot more straight forward! Great work!
Jeff

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