Highlights w/ Vertex Lighting??

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Hi,

Does anyone know if it's possible using vertex-lighting techniques to ''light'' an object so as to create highlights as you might get when using basic DX7 lights (eg. with a mesh's shininess set to 1.0) ?! I've not been able to color a vertex/object above it's default 100% diffuse (textured-)color... which makes sense I understand, but it there a 'trick' to create some additive effect to it (ie. without using lightmapping)...?!

Thanks,
Danny