VBO / PShape3D with Processing 2.0

Core Library Questions

David Wil..

VBO / PShape3D with Processing 2.0

in Core Library Questions • 1 year ago

I'm a little confused - I'm used to developing for A3D by using the OpenGL2 library for desktop then switching renderers to A3D to test on a device when working with VBO's etc, but as I understand it there is no longer OPENGL2, it's just OPENGL and none of my PShape3D code works...

What's the best approach for running my geometry on the GPU?

Thanks

Dave

Calx | http://calx.co.uk

Replies(5)

andres

Re: VBO / PShape3D with Processing 2.0

1 year ago

Hello, in the transition from 2.0a4 to 2.0a5 the OpenGL renderer (which now is just called P3D on all platforms, although you can still use the OPENGL identifier) was basically re-written from scratch. This involved in particular making the retained mode (i.e.: PShape3D) consistent with the rest of the drawing API in Processing.

Please take a look a examples included in the opengl category, specially those inside the "Performance" folder which compare immediate and retained mode rendering. Basically, you now create a new PShape3D using the createShape() function and then add vertices to it by calling the vertex() function in the PShape object:

PShape tri;
void setup() {
size(400, 400, P3D);
tri = createShape(TRIANGLES);
tri.noStroke();
tri.fill(255);
tri.vertex(0, 0);
tri.vertex(50, 0);
tri.vertex(50, 50);
tri.end();
}
void draw() {
background(0);
translate(mouseX, mouseY);
shape(tri);
}

You don't need to explicitly refer to the PShape3D class, since it is a subclass of PShape and all the necessary API for defining the geometry is exposed in PShape.

David Wil..

Re: VBO / PShape3D with Processing 2.0

1 year ago

Ye gods, that's too easy for words.

Thanks so much, Andres!

P2 is gonna be a game-changer for sure.

All the best

Dave

Calx | http://calx.co.uk

billautom..

Re: VBO / PShape3D with Processing 2.0

1 year ago

Where are the buffers generated? I'm trying to make the VBO from a PShape visible to OpenCL and I can't seem to find the call that creates the index for the VBO.

Thanks!

billautom..

Re: VBO / PShape3D with Processing 2.0

1 year ago

Can I set the individual colors of the vertices?

andres

Re: Re: VBO / PShape3D with Processing 2.0

1 year ago

Hello, all the GL ids are public variables in PShapeOpenGL:

// polygon (fill) geometry

glPolyVertexBufferID

glPolyColorBufferID

glPolyNormalBufferID

glPolyTexcoordBufferID

glPolyAmbientBufferID

glPolySpecularBufferID

glPolyEmissiveBufferID

glPolyShininessBufferID

glPolyIndexBufferID

// line geometry

glLineVertexBufferID

glLineColorBufferID

glLineAttribBufferID

glLineIndexBufferID

// point geometry

glPointVertexBufferID

glPointColorBufferID

glPointAttribBufferID

glPointIndexBufferID

Is this what you need?

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