Introduction to Computer Graphics, Section 7.2 -- Lighting and Material
LearnOpenGL - Light casters
opengl - GLSL spotlight projection volume - Stack Overflow
Spotlights · LegacyOpenGL
glsl - opengl - spot light moves when camera rotates when using a shader - Stack Overflow
LearnOpenGL - Light casters
Spotlight Shadows
LearnOpenGL - Light casters
opengl - GLSL spotlight projection volume - Stack Overflow
LearnOpenGL - Light casters
GLSL Tutorial – Spotlights » Lighthouse3d.com
Modern OpenGL 08 – Even More Lighting: Directional Lights, Spotlights, & Multiple Lights — Tom Dalling
Tutorial 21 - Spot Light
c++ - How to visualize a spot light in Opengl? - Stack Overflow
Transformation and Lighting in Cg | 3D Game Engine Programming
LearnOpenGL - Light casters
Modern OpenGL 08 – Even More Lighting: Directional Lights, Spotlights, & Multiple Lights — Tom Dalling
opengl - How to create a 2D spotlight? - Stack Overflow
Spotlight | Electric Soup
Chapter 5 - OpenGL Programming Guide
per-vertex lighting | Learn OpenGL ES
Tutorial 21 - Spot Light
Per-Fragment Spotlight Effects in OpenGL - YouTube
Glow/Spotlight shader not working on OSX/Android/iOS (OpenGL) - Unity Forum
OpenGL ES SDK for Android: Projected Lights
opengl - How can I change my fragment shader to allow 2 more spotlights? - Stack Overflow
