opengl object render problem

Contributed Library Questions

djtoon

in Contributed Library Questions • 2 years ago

im drawing a polygon plane like this

GLModel modeler = new GLModel(this, 4, TRIANGLE_FAN, GLModel.DYNAMIC );

// Updating the vertices to their initial positions.

modeler.initNormals();

modeler.beginUpdateVertices();

modeler.updateVertex(0, 0-w/2, h/2, 0);

modeler.updateVertex(1, 0-w/2, 0-h/2, 0);

modeler.updateVertex(2, w/2, 0-h/2, 0);

modeler.updateVertex(3, w/2, h/2, 0);

for some reson when i render i get a line in the middle of the two polygons that make the plane

any idas?

its like im seeing the polygon edge

10x

Replies(3)

calsign

Re: opengl object render problem

2 years ago

I believe this whole internal line thing in OPENGL is asked a lot...
Try hint(OPENGL_4X_SMOOTH) right after size() in combination with noSmooth()...
And also look here.

But then again, that might just be for basic shapes...

djtoon

Re: opengl object render problem

2 years ago

didnt fix it yet :(

andres

Re: opengl object render problem

2 years ago

This code generates a simple triangle fan with glgraphics and no edges are seen:

import processing.opengl.*;
import codeanticode.glgraphics.*;
GLModel fan;
void setup() {
size(640, 480, GLConstants.GLGRAPHICS);
fan = new GLModel(this, 7, TRIANGLE_FAN, GLModel.DYNAMIC);
fan.beginUpdateVertices();
fan.updateVertex(0, -1.0, -0.5, 0);
fan.updateVertex(1, 1.0, -0.5, 0);
fan.updateVertex(2, 0.0, 0.5, 0);
fan.updateVertex(3, -1.5, 0.0, 0);
fan.updateVertex(4, -1.8, -1.0, 0);
fan.updateVertex(5, 0.2, -1.5, 0);
fan.updateVertex(6, 1.0, -0.5, 0);
fan.endUpdateVertices();
fan.initColors();
fan.beginUpdateColors();
for (int i = 0; i < fan.getSize(); i++) {
fan.updateColor(i, 250, 50, 50, 255);
}
fan.endUpdateColors();
}
void draw() {
GLGraphics renderer = (GLGraphics)g;
renderer.beginGL();
background(0);
translate(width/2, height/2, 0);
rotateY(frameCount * 0.01);
scale(100);
renderer.model(fan);
renderer.endGL();
}

Maybe there is some other problem in your code.

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