Well,

I've got this 5 second animation where the sun rises and then sets. The scene is in a room with global illumination.

As the directional light's intensity changes, in the real world, so should the strength of the bouncing light in the room. Which means that as the incoming sunlight weakens, the bouncing light in the room should also weaken.

This is not the case in Maya/ Mental ray. The intensity of the primary light source and the bouncing light are independent. So as I key frame the intensity of the primary lgiht source, the directional light, I'm trying to key frame the photon intensity of my GI to match it.

any suggestions?

Thanks!