I am working on importing a model into a scene using the THREE.js OBJ loader.
I know that I am able to import the geometry fine, because when I assign a MeshNormalMaterial to it, it shows up great. However, if I use anything that requires UV coordinates, It gives me the error:
[.WebGLRenderingContext]GL ERROR :GL_INVALID_OPERATION : glDrawElements: attempt to access out of range vertices in attribute 1
I know this is because the loaded OBJ has no UV coordinates, but I was wondering if there was any way to generate the needed texture coordinates. I have tried
material.needsUpdate = true;
geometry.uvsNeedUpdate = true;
geometry.buffersNeedUpdate = true;
...but to no avail.
Is there any way to automagically generate UV textures using three.js, or do I have to assign the coordinates myself?
To my knowledge there is no automatic way to calculate UV.
You must calculate yourself. Calculate a UV for a plane is quite easy, this site explains how: calculating texture coordinates
For a complex shape, I don't know how. Maybe you could detect planar surface.
EDIT
Here is a sample code for a planar surface
(x, y, z)
wherez = 0
: