Question

My cube isn’t rendering as expected when I use GL_BLEND.

glEnable(GL_CULL_FACE);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);

I’m also having a similar problem with drawing some semi-opaque vertices in front, which could well be related.

Related: Why do my semi-opaque vertices make background objects brighter in OpenGL?

Here’s what it’s supposed to look like:

Normal cube http://img408.imageshack.us/img408/2853/normalcube.png

And here’s what it actually looks like:

Dark cube http://img7.imageshack.us/img7/7133/darkcube.png

Please see the code used to create the colored cube, and the code used to actually draw the cube.

The cube is being drawn like so:

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();
glLoadIdentity();

// ... do some translation, rotation, etc ...

drawCube();

glPopMatrix();

// ... swap the buffers ...

Answer 1

You could try disabling all lighting before drawing the cube:

glDisable(GL_LIGHTING);