Hi I'd be ever so grateful if you know and give the answer to this: I'm trying to put a texture image on a quad, then constantly rotating it around the z axis (say a smiley face on a square). But somehow it keeps tiling the image or distorting it. I've bound the texture to a square in a function called drawTexRect() using glTexCoord2f and glVertex3f with every corner of the square being a bit inside the texture i.e., going from 0.2 to 0.8 , I've experimented with other mappings too. and then: float angle = 0.1, glBindTexture(GL_TEXTURE_2D, tex); glMatrixMode(GL_TEXTURE); glLoadIdentity(); glRotatef(angle, 0.0, 0.0, 1.0); glMatrixMode(GL_MODEL_VIEW); drawTexRect(); then the angle become angle+= 0.1 in my animateFunction so that the image keeps rotating. I've even tried glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP); but the image kept moving out of the quad. Many thanks

>>but the image kept moving out of the quad.
most likely since the rotation happens around 0,0 but u want it to happen at 0.5,0.5 the center of the quad

anyways better if do the rotation yourself

float c = cosf(rot);
float s = sinf(rot);

glTexCoord2f( 0.5+c, 0.5+s );
glTexCoord2f( 0.5+s, 0.5-c );
glTexCoord2f( 0.5-c, 0.5-s );
glTexCoord2f( 0.5-s, 0.5+c );

Thank you both so very much. I shall try out the suggestions and report back.
:O)

Thanks very much it worked. I translated the texture to the origin and translated it back.