I'm currently trying to make a simple model viewer for the iPod Touch, and I managed to render the model meshes where vertex blending is not performed (that is, mesh is attached to a single skeleton bone matrix).
In cases were a mesh use weights to perform blending, is there a way to do it in the ipod Touch using OpenGL ES 1.1?
thanks in advance
There's no hardware support for vertex blending but you can always do the blending yourself on the CPU. Here's a link to a VFP optimized math library.
If the implementation you’re running on supports OES_matrix_palette (which should be the case on every iPhone and iPod touch so far), you can transform each vertex by a weighted mix of a few matrices from a palette. The maximum number of matrices per vertex and palette size are implementation-dependent, but the spec mandates at least 3 matrices from a palette of at least 9.
On newer devices, matrix palette transformation is always performed on the GPU. On older hardware, you may wind up with a software fallback if you enable more than 2 fixed-function lights. You may still want to consider using your own software vertex transformation if vertex size becomes a bottleneck on older devices.