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I am trying to create a spot light on an object/floor. I have found the post that allows you to do this for a matrix, but is a very choppy circle. I either get the whole object lit or not all, no spot can be seen anywhere!

Also I have tried a lightmap sample from the forums that works well, but when I texture the floor and scale the texture the light map is effected also.

This is the code i got for the spot on the matrix

Change

make matrix 1,200,200,50,50

to

make matrix 1,200,200,100,100

in order to make the spotlit area more detailed, the problem is with the way that directx calculates lights, the lighting is calculated per vertex, so if you illuminate a low poly object the effect is not so good and the light isn`t as bright, you get the same in some commercial games, noticed how the torch in Halflife is inconsistent when illuminating the inside of air ducts etc???, since they are low poly you get a lit/not-lit effect that looks quite unrealistic, you might also like to play with the vertices on the matrix, but I don`t know about that since the math is more than I can be bothered/able to learn.

Mentor.

I have already tried changing as advised, but it kills the performance in that small demo alone. The rest of your post has helped as I never realised the way the lights were calculating.

Thanks! I have managed to solve the problem i was having by playing with lightmaps, which I still don't understand yet!