   changing the texture coordinates
  Hi!Can someone tell me how to change texture coordinates withoutlocking the vertex buffer.I have a big texture with many tiles in it. And i have a vertexsquare to draw the a part texture on it. Now I don''t want to create a square for every tile. I just want to use the old vertex square and change the texture coordinates. Is ist possible to change them without locking, because locking is avery expensive operation.  
  Locking isn''t expensive in itself. Inappropriate locking is what is bad.Common methods of modifying texture coordinates without altering VB:1. Texture Coordinate Processing - texture transformation matrices and automatic texture coordinate generation.2. Vertex shaders. --Simon O''ConnorCreative Asylum Ltdwww.creative-asylum.com;  Is there a tutorial on this?  