   3d textures performance for atlasing
  Hi guys!Can you give to me some information on performance of 3d textures on current generation of video cards ? ( I mean video HW starting from GeForce 6600 and ATI equivalents ).Can I use 3d textures instead of ordinary 2d textures without performance loose ?Is this good idea ?I whant use 3d textures for texture atlasing. For example use 6 layer 3d texture where0 - 2 layers is a diffuse and 3 - 5 is a corresponding normalmap. I whant in this vay avoid textureswitching for normalmap and diffuse. My idea now is under research but now I need some information on 3d textures.Thanks for help.   
  Generally 3D textures can make things slower.However, the bottom line is that you have to measure competing implementations of the same algorithm with real data on representative hardware in order to draw conclusions about performance.There are too many variables to make blanket-wide statements that are always true about performance, beyond things like not setting redundant state.   