Opening GL: Adding Lighting: Normals
opengl - How can I calculate a terrain's normals? - Game Development Stack Exchange
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OpenGL Normal Vector Transformation
Unity - Manual: Computing a Normal/Perpendicular vector
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performance - OpenGL - How to calculate normals in a terrain height grid? - Stack Overflow
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014.) Normals and Diffuse Lighting - OpenGL 4 - Tutorials - Megabyte Softworks
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Weighted Vertex Normals
opengl - GLSL calculating normal on a sphere mesh in vertex shader using noise function by sampling is producing strange graphical errors - Stack Overflow
Simple way to calculate normal vectors in OpenGL | C++ | GLUT - YouTube
Shading Normals Using Opengl Graphics Programming | LearnCAx
Introduction to Shading
OpenGL Math Visualizer - 6 - 3D Surfaces and Calculating Normal Vectors - YouTube
Graphics Compendium | Surface Normals
