DirectX lighting Issue - Help

Hi,

First, set your light's type to D3DLIGHT_POINT
Then, fill the position, and the diffuse, specular, etc. colors
And the last step : set the attenuation factors. They specify how the lighting decrease with the distance to the light point.

There is a good chapter on light properties in the Help of the DirectX SDK, you should read it to know how to tune the attenuation factors.

But for a start, you can try Attenuation0 = 0.0f, Attenuation1 = 1.0f and Attenuation2 = 0.0f
This setting gives an intensity of the light of 1/D where D is the distance between the light point and the lighted vertex.

.:: Paic Citron ::.

Also, if you're using vertex lighting make sure your box is well tesselated.

Yes, it sounds like your problem here is because of "tesselation." What this means, in the context of your problem is that the box doesn't have enough triangles to light it. DirectX only supports vertex lighting, which basically means that the colours are only set on the vertices, and then the pixels between the vertices are interpolated.

To solve this problem you could tesselate your mesh, using a 'patch mesh', or you could use HLSL to create a per-pixel lighting shader. This means that instead of lighting the vertices and interpolating the values of the pixels, you actually light each pixel, making it much more accurate.

Hope that clears some things up for you :)

Yes the problem was with the huge box only being made from 12 triangles.

Many Thanks