Since the computer I'm using does not support shaders (VS 1.0), I'm looking into learning some FFP. I can't seem to find any good material though.

Can anyone explain to how the dotproduct3 stage works? Does it just assume a light direction? I couldn't get much out of the shader in the manual or the wiki...


Thanks for any info....

This is what the DirectX documentation says about it:

Quote:

---

D3DTOP_DOTPRODUCT3
Modulate the components of each argument as signed components, add their products; then replicate the sum to all color channels, including alpha. This operation is supported for color and alpha operations.
S_rgba = (Arg1_r*Arg2_r+Arg1_g*Arg2_g+Arg1_b*Arg2_b)

---

You can find all parameters for ColorOp if you look for this keyword: D3DTEXTUREOP

There are a couple of good articles that I had found when I was doing this. If I find them, I will edit with the links this weekend.

One I have re-found at this moment is:
http://www.two-kings.de/tutorials/dxgraphics/dxgraphics14.html

A shot I had, when I was becoming happy with how the FFP normalmapping was beginning to go.