Incorrect Vertex Winding in src/4.advanced_opengl/

[Andrew-Hinkle]

I noticed a minor issue with the vertex array for the cubes in the advanced opengl section are ordered wrong, which causes a minor visual glitch for texturing. I found that the last 2 vertices in the cubeVertices array are swapped, so the winding order causes the texture to draw incorrectly.

The last block over vertex data in the array should be:
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f

[JoeyDeVries]

I didn't notice any visual artifacts on the original winding order (same on getting started section). Which specific chapter did it break for you, do you have a screenshot for what you've been seeing as well?

[Andrew-Hinkle]

Hi Joey,

I noticed the issue on the depth testing, stencil testing and blending chapters, but I didn't notice any issues before the advanced opengl section.

Here is what I'm seeing using the original vertex array:

Here is what I see when I swap the last two vertices' order:

I swapped to a uv grid texture to diagnose what was happening. Its entirely possible I have some other issue, but I wanted to bring it up in case anyone had a similar issue to what I saw.

[JoeyDeVries]

Hmm, just checked with a different texture as well on my end, but it all looks correct here. Since I'm not sure what's happening here I can't put your changes in, but let's leave this one open and see if others have similar issues. Maybe from that we can figure out the pattern.

[Andrew-Hinkle]

Sounds good, thanks for checking it out!