   texture mapping problem!
  I have studied your OpenGL tutorials for a long time.I am very interested in the texture mapping.Now,I have a question solve in time,however,I have no good idea for it after thinking again and again.My question as follows :    Can I map two or more two textures on one face of an object and keep those textures aligning according to some kinds of rules,rather than blending or replacing each other?for example ,the right top of the face is mapped by texture0,the left bottom of it is mapped by texture1.    Looking forward to reply!    Thank you in advance.   simon 
  in theory   if you was to set the repeat mode of both textures not to repeat in the vertical, then set the first textures coords to that the top of the quad maps to 0,0 -> 1,0 and the bottom maps to 0,2 -> 2,2 you''ll have the top half covered by half of one texture, then do the same with the second texture but invert the coords (you''ll have to invert the image as well i think) ;  Isn''t that what Multitexturing is for?   // Last Attacker   \\---=( LA   )=---// LA Extreme   \\ICQ Number :   120585863E-mail:   laextr@icqmail.com ;  yes, you could do it with two texture units, however as he only wants one texture in the top half and one in the bottom half, i assume without much/any overlap, the way put forward should work 