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Modern OpenGL 08 – Even More Lighting: Directional Lights, Spotlights, & Multiple Lights — Tom Dalling
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Simulating a spotlight | OpenGL 4 Shading Language Cookbook, Second Edition
LearnOpenGL - Light casters
Spot light shining on a flat surface - Stack Overflow
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C++ Opengl - lighting using spotlight - Stack Overflow
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Modern OpenGL 08 – Even More Lighting: Directional Lights, Spotlights, & Multiple Lights — Tom Dalling
08.) Simple Lighting - OpenGL 3 - Tutorials - Megabyte Softworks
Modern OpenGL 08 – Even More Lighting: Directional Lights, Spotlights, & Multiple Lights — Tom Dalling
Introduction to Computer Graphics, Section 7.2 -- Lighting and Material
