in a few videos i have seen normal maps
but i donth now what they are and what they do.
there are no good tutorials on youtube so i ask it here.
what are normal maps?
A starting point. http://wiki.blender.org/index.php/Doc:Manual/Textures/Maps/Bump_and_Normal_Maps
http://wiki.blender.org/index.php/Doc:Manual/Textures/Maps/Displacement_Maps
They fake the look that your object has more 3 dimensional detail than it really has. You can then have a low polygon model that looks like a high polygon model, useful for in game models and faster rendering. If you use a displacement map it actually does displace your geometry so for high detail you need very high resolution mesh.
A mix of displacement map to give low detail displacement in combination with a normal map to give high details can be used to give the benefits of both methods.
ok i tink it was someting like the displace modefier
and thanks
i gona use this