Re: Texture - Object association under subdivision
In Reply to: Texture - Object association under subdivision posted by ati3414 on January 25, 2005 at 19:33:59:
: I have read a lot of papers before asking this question : I cannot find any reference as to how one generates the texture coordinates for a subdivision surface. Case and point: I am trying to to subdivide a surface in real time
: (adaptively with respect to the distance between the object and the viewer). I think I got a fairly good idea how to produce a good termination criterion. The thing is: how can I generate the association between the texture space and the object space? How do I get the (u,v) texture pair for each vertex generated by subdivision? Most of the objects shown in the current papers are untextured.....
Subdivision is a parametric process. This means that you can associate any values that you want with the vertices and they may be subdivided as well. So one technique is to not only subdivide the geometric positions of the vertices but their texture coordinates as well. Editing such texture coordinates may be somewhat difficult though because the values you assign to the base mesh do not necessarily coincide with the values after subdivision. (There are ways around this problem using the limit masks associated with the subdivision scheme though.)
Another possibility is simply to associate some texture function like cylinderical projection with the object and automatically generate texture coordinates for the mesh. This process is not very desirable though because the artist has little to no control over how the object is textured.