Right, so I finally have something moderately technical to put in my journal. Hope you guys find it useful [grin]

This is an extension of yesterdays overview on lighting.

Blinn-Phong

This model is pretty much the defacto-standard kicking around today. It's also pretty similar to what you can get if you use the Direct3D fixed-function lighting. Seems like a good place to start.

There are a few similar variants kicking around, and this following equation is the one I'm going to use:



The subscript 'I' (Intensity) and 'C' (Colour) parts can be rolled into one, making there 3 colours in the equation: Ambient, Diffuse and Specular.

Inputs

Diffuse Texture Map

Specular Texture Map

Normal Texture Map

Ambient Term Constant

Specular Power Constant

Light Position Constant

Light Range Constant

Light Falloff Constant

World Matrix

World*View*Proj Matrix

Vertex Data

Position

Normal (Computed with D3DXComputeNormals())

Tangent (Computed with D3DXComputeTangents())

TexCoord

All fitting into this lovely Visio diagram: