My map has strange lighting. When I walk or look around, sometimes walls randomly (but consistently) change their brightness. It's a bit like the standard HDR effect when you walk out of a dark area and everything's really bright for a second, but it happens much faster and at unpredictable times. For lighting, I'm using the light_panel_32x128_warm_med instance and the observation room instances.

Does anyone know what causes this, and how to fix it?

cg5 wrote:
My map has strange lighting. When I walk or look around, sometimes walls randomly (but consistently) change their brightness. It's a bit like the standard HDR effect when you walk out of a dark area and everything's really bright for a second, but it happens much faster and at unpredictable times. For lighting, I'm using the light_panel_32x128_warm_med instance and the observation room instances.

Does anyone know what causes this, and how to fix it?

You used the _vertex version of the textures. Use the ones without _vertex in thier name.

Thanks a lot. This also fixed a problem in which surfaces textured as such were immune to gel.

For curiosity's sake, what are the _vertex textures used for?

cg5 wrote:
Thanks a lot. This also fixed a problem in which surfaces textured as such were immune to gel.

For curiosity's sake, what are the _vertex textures used for?

They're used as skins for models, hence the vertex bit. Unfortunately, that means they glitch out when used on brushes.