I made a variable in shader code, like, varying vec4 TexCoord1; and use it exactly same as gl_TexCoord. but result is quite defferent. Texture coordinate is calculated by my own code. So, only my implementation affects it. I don't know why two (varying and built-in)variables are different. [Edited by - ilys4 on October 25, 2006 4:40:58 AM]