Based on the emission, absorption, diffusion, reflection and scatteration of light by a voxel, it is suitable for generating and rendering realistic images of complex scenes.
Although I have said that the water bear does not undergo any form of metabolism during cryptobiosis, it actually has a metabolic rate of 0.1%, rendering it almost dead, but yet, not dead.
As mentioned above in the directional lights section, the rendering of shadows for directional lights is an approximation that allows us to use a single render to cover a largeish area with shadows.