How to Rotate a Vertex by a Quaternion in GLSL
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OpenGL ES 2.0 shader development on your iPadGet started with OpenGL ES 2.0 shader development on your iPad, iPhone or iPod touch today. Create your own vertex and fragment shaders using the OpenGL Shading Language (GLSL) and compile them on your mobile device. Tweak your shader code and the values of the uniforms and see the effects immediately.