Been doing some tests with animation and came across a problem with emitters. I set up a simple scene in Blender with a moving spot light. The spot light is a cylinder with one end removed. I placed a square plane within as a light source and set it up as a diffuse emitter with a power of 2000. I then parented both to a path so it would swing around the scene.
If I set the emitter plane to "movable proxy" and rendered the animation in the Blender plugin the light would start out bright and then rapidly dim. If I set the mesh type to "global" it works fine and the brightness stays constant through out the animation.
This was fine until I tried to export the animation out as a Alembic file. Now when I render the animation in standalone (2.12.1) the emitter has the same behavior that it had when set to "movable proxy". The light starts out bright and by the 3rd frame dims to almost dark. As the rendering continues the emitter power appears to jump around randomly brightening and then dimming but never as bright as it was on the first two frames.
I'm not animating the emitter power so I'm not sure what is going on?
Thanks,
Jason