error when using SpecularGlossinessMaterial

[djmannion]

Hi, thanks for this very useful library.

I was wondering if it is possible to use SpecularGlossinessMaterial?

I have tried editing example.py with:

bottle_material = pyrender.material.SpecularGlossinessMaterial()
bottle_mesh = Mesh.from_trimesh(bottle_trimesh, material=bottle_material)

but I receive an error:

Traceback (most recent call last):
  File "example.py", line 131, in <module>
    v = Viewer(scene, shadows=True)
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/viewer.py", line 347, in __init__
    self._init_and_start_app()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/viewer.py", line 1003, in _init_and_start_app
    pyglet.app.run()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyglet/app/__init__.py", line 142, in run
    event_loop.run()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyglet/app/base.py", line 164, in run
    self._legacy_setup()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyglet/app/base.py", line 253, in _legacy_setup
    window.dispatch_pending_events()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyglet/window/xlib/__init__.py", line 877, in dispatch_pending_events
    EventDispatcher.dispatch_event(self, *self._event_queue.pop(0))
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyglet/event.py", line 370, in dispatch_event
    if handler(*args):
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/viewer.py", line 606, in on_resize
    self.on_draw()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/viewer.py", line 566, in on_draw
    self._render()
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/viewer.py", line 985, in _render
    self._renderer.render(self.scene, flags)
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/renderer.py", line 140, in render
    retval = self._forward_pass(scene, flags)
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/renderer.py", line 345, in _forward_pass
    primitive, flags, ProgramFlags.USE_MATERIAL
  File "/home/damien/venv/intrinsic_behav/lib/python3.7/site-packages/pyrender/renderer.py", line 952, in _get_primitive_program
    elif isinstance(material, SpecularGlossinessMaterial):
NameError: name 'material' is not defined

[keunhong]

SpecularGlossinessMaterial seems to be broken. I'm working on fixing it.

1. The reference to material is undefined in the line your error occurrsed. It should be primitive.material.
2. The class itself seems to be broken. The getter functions reference themselves rather than underscored member variables.
3. mesh.py also doesn't load obj material properties and instead loads a default material of a texture image isn't present.
4. The shader doesn't use the parameters from SpecularGlossinessMaterial at all.

[keunhong]

Preliminary implementation in #64