When I go to play Portal 2, I get to the part where i'm using the gels and there are some problems...

- First of all, it doesn't show up on the floor or on the walls.

- Second, the gel blobs have absolutely no shading to them whatsoever. They look like they were filled in using the paint bucket tool in MS Paint.

- Third, I've been watching some videos, comparing them to my game, and I think the game lighting is a lot brighter than it's supposed to be.

If you can help then thanks!

This is on a PC.