Data preparation memory leak about pifu

[kampelmuehler]

I think this might be because this function is never called:

PIFu/lib/renderer/gl/prt_render.py

Line 198 in f0a9c99

def cleanup(self):

calling it within the render loop hinders the infinite memory growth.

Be aware that it fails at this statement though

PIFu/lib/renderer/gl/prt_render.py

Line 212 in f0a9c99

glDeleteBuffers(1, [])

which I think is safe to remove.

It should then be safe to call rndr.cleanup() (and potentially rndr_uv.cleanup()) after every finished obj.

[kampelmuehler]

btw: there's a small leak remaining but not nearly as scary.