Using ETM to paint in real time on a wall?

Realgar

19-03-2010 15:23:24

Hello, I want to make a real time tool for painting wall art on a cave wall (I work in prehistory). I want to move the light source to show the relationship between relief and painting. Is it possible to "cheat" using ETM? Do you think there is another way of painting in real time mesh simpler (I do not necessarily need to create terrain, just paint)?
Thank you very much in advance and I congratulate you for all your work!