problem of 3d texture

hello,i use two images to make 3d texture .the wide and height of image is 256256 and one image is white,the other is blue. so the 3d texture is 256256*2.when i do the texture mapping with alpha blend,what result is right?i can see the interval vertical stripes of white and blue

Originally posted by hwj_just:
hello,i use two images to make 3d texture .the wide and height of image is 256256 and one image is white,the other is blue. so the 3d texture is 256256*2.when i do the texture mapping with alpha blend,what result is right?i can see the interval vertical stripes of white and blue
First, no need to start a new thread.

The result that you get depends on the tex coords, but to produce vertical stripes of white and blue, you could create a quad like this

glBegin(QUADS)
glTexCoord(1.0, 0.0, 0.0)
glVertex(1.0, -1.0, 0.0)

glTexCoord(1.0, 0.0, 1.0)
glVertex(1.0, 1.0, 0.0)

glTexCoord(1.0, 1.0, 1.0)
glVertex(-1.0, 1.0, 0.0)

glTexCoord(1.0, 1.0, 0.0)
glVertex(-1.0, -1.0, 0.0)

glEnd

and make texture wrap mode REPEAT for r. s and t doesn’t matter.

Read the Red Book or some online resource about texture mapping, as this is basic stuff.