Render planes onto terrain? What to use instead of projectors?

Hi guys. I’m working on some sort of a grid system for my game which basically displays info about possible movement for units (think of grid from Heroes of Might & Magic?).

Now I tried to create projectors for each square tile that unit can go to but it causes big fps drops with many projectors running. What should I use?


My alternatives:

If it is a small and you want a nice graphics, generate a dynamic texture for all terrain and blend it with terrain texture.

For large ones, I think that you need to use simple planes with transparent texture. If you have a irregular terrain you will need to create a mesh dynamically, especially if you want it with smooth curves.