so im kindof stuck and its been that way for a week now. im making a map for my freind. i made a dark rocky texture for the map but i want the cracks in between the rock to glow in a sortof changing glow. im stuck with using shader environments because its bsp. is there a way i can get the cracks of the rock to glow a particular color using a fade effect? i wanted it to kindof glow red and then black like a volcano. without using another shader. ive been looking at tutorials and getting help from halo mappers. but im still stuck.