An artist gave me all 3D models for me exporting to .obj and .mtl in order that I can render it using OpenGL.
But I can't figure out why the texture vertex are greater than 1 and sometimes negative. Take a look at this example:
(...)
vn -0.000717425 0.00106739 -0.00991695
vn 3.49779e-09 -5.22866e-09 -0.01
vn -0.00142294 0.00211706 -0.00966919
vn -0.00831486 -0.00555545 0
vt 5.82424 -20.091
vt 6.97527 -20.1873
vt 5.81848 -20.1618
vt -7.48189 8.29159
(...)
He sent me all textures on TGA format, which I am loading it correctly, but I am not being able to map these vt
s to a correct OpenGL texture vector.
But I can't figure out why the texture vertex are greater than 1 and sometimes negative.
Texture coordinates outside the [0..1]
range indicate texture repetition.
Given a 1D texture ABCD
:
-1 0 1 2
....|ABCD|ABCD|ABCD|....
Make sure GL_TEXTURE_WRAP_S
and GL_TEXTURE_WRAP_T
are set to GL_REPEAT
.
来源:https://stackoverflow.com/questions/22465212/mapping-wavefront-obj-texture-vertex-on-opengl