morphing model
Looks like your jit.gl.models aren't passing normals. You can render the geometry using jit.gl.mesh with @auto_normals 1 to have them generated for you.
I'm not sure I get it, maybe is my fault but seems the mesh is not rendering anything... anyway it wasn't so important this project so it's ok :)
thanks for the answer! i'll play with this patch again when i'll have free time and if i discover something i'll post it!