1. A global illumination system comprising: a hardware processor and a memory; an illumination rendering unit including a virtual object discrimination module stored in the memory, wherein the hardware processor is configured to execute the illumination rendering unit to: perform a first render of an illumination of a scene including a plurality of virtual objects, the first render being a primitive render of the illumination of the scene; determine, using the virtual object discrimination module, a score for each of the plurality of virtual objects corresponding to its respective contribution to the illumination of the scene; identify, using the virtual object discrimination module, one or more of the plurality of virtual objects as disregardable based on their respective scores; and perform a second render of the illumination of the scene while disregarding presence of the identified one or more of the plurality of virtual objects as disregardable in the scene.