[fixed] OBJ loader texcoord bug

giliamdecarpentier · Post by **giliamdecarpentier** » Fri Dec 12, 2008 4:50 pm

The texture v-coordinates in the OBJ mesh loader are negated (i.e. v = -v) in COBJMeshFileLoader.cpp:585 (version 1.4.2), causing typical v coordinates to lie outside the 0-1 range. Consequently, non-wrapping texturing modes will cause unexpected results/problems when used on OBJ meshes. This can also be problem for complex uv-manipulating shaders. Please note that this implementation differs from, for example, C3DSMeshFileLoader.cpp:987, which flips (i.e. v = 1-v) the v component.

A simple fix, then, would be to change COBJMeshFileLoader.cpp:585 from:
vec.Y=-core::fast_atof(wordBuffer); // change handedness
to:
vec.Y=1-core::fast_atof(wordBuffer); // change handedness

Giliam

hybrid · Post by **hybrid** » Fri Dec 12, 2008 5:04 pm

Wow, one of the last minute bug fixes for 1.5. Should make it into the release

Note that I changed the method name as well, as this inversion is only possible for texcoords, not for usual 2d vectors...

rogerborg · Post by **rogerborg** » Fri Dec 12, 2008 5:19 pm

Welcome to the community! Can I get you a beer? 3DModellerGuy, get this man a beer.