For example, I found this in the old wiki under a section about HLSL shaders, and it says, "For applying dynamic lights, use the following function:"

That's all it says, and this seems to be the best explanation I can find, even though I don't know where to use it.

PS It was late when I started this thread so I think I may have put it in the wrong forum, should be in scripting.. sorry

Code:

---

        float4 vecLightPos[8];
        float4 vecLightColor[8];
        float3 vecFalloff = float3(0.f, 0.f, 2.f);
        ...
        float4 DoPointLight(float3 P, float3 N, int i)
        {
// calculate the light ray pointing from the light to the surface
                float3 D = (float3)vecLightPos[i]-P;
// calculate the angle between surface and light ray
                float NdotL = dot(N,normalize(D));
// modulate the light by the surface angle
                float4 Color = vecLightColor[i] * NdotL;

// calculate the light attenuation factor, DX uses a really strange formula here
                float fac = 0.f;
                if (NdotL >= 0.f && vecLightPos[i].w > 0.f)
                {
// get the distance factor
                        float LD = length(D)/vecLightPos[i].w;
#ifdef DXLIGHTING
                        if (LD < 1.3f)
                                fac = 1.f/(vecFalloff.x + vecFalloff.y*LD + vecFalloff.z*LD*LD);
#else  // linear Lighting
                        if (LD < 1.f)
                                fac = 1.f - LD;
#endif
                }
                return Color * fac;
        }

---