WebGL - Point lighting in the fragment shader

In this episode, I discuss how to do per fragment point lighting.
Concepts:

• Lighting
• Surface color by diffuse reflection = light color base color of surface cos A
• Diffuse reflection = reflection differs by light position
• Angle(A) = between the light and surface
• Surface color by ambient reflection = light color base color of surface
• Ambient reflection = same reflection at any position
• Surface color by diffuse and ambient reflection = surface color by diffuse + surface color by ambient

Resources:

• https://github.com/davidwparker/programmingtil-webgl/tree/master/0077-lighting-part-6-point-light-frag