CODEWITHSUNDEEP
opengl-esglkit
AlvinfromDiaspar
AlvinfromDiaspar

Reputation: 6824

How can GLKit draw triangles using both CW or CCW notation?

I have a simple textured quad (composed of 2 triangles) that im rendering in my iPhone app using GLKit.

Now for some reason I am not seeing any difference when defining my vertices with CW notation vs CCW notation. Why is this? Note that I am using the default GLKit project template with minimal changes. Also, I am using the GLKBaseEffect for rendering, not ES2.

Upvotes: 0

Views: 488

Answers (1)

rmmh
rmmh

Reputation: 7095

For a quad, CW vs CCW changes the normal -- which side of the triangles is "up". Facet culling is disabled by default (use glEnable(GL_CULL_FACE) to enable it), so both the "up" or the "down" triangles will be rendered.

Upvotes: 1

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