Getting direct illumination by sampling a shadow map

Questions
1

I’m trying to find a global illumination solution for my application, and I need it to be fast.

So I tried to get direct illumination into the light map by sampling a shadow map.

The light map’s resolution is pretty low, and caused the problems of aliasing ( in my case, it’s 128 * 128 for the ground).

Lightmap

Is there any way to improve this?

Thank you all for reading my post, and sorry for my poor English.

3

Why not just increasing the resolution of the light map?

1 Like
4

Thank you for the reply.

I compute the illumination in the texture space, so increasing the resolution will make it much slower.
And when the scene becomes much more complicated, the light map will be huge.