Lighting

While the 3D geometry defines the shape of your content, lighting is the basis of every virtual scene defining colors and final look of your objects. UNIGINE features the following types of the light sources:

• Dynamic lighting is a customizable solution providing real-time lighting calculation. This advanced technique provides very realistic lighting as it can illuminate dynamic objects. Light sources themselves can be moved or changed in real time (for example, turned on and off). As the most objects in the scene are rendered in the deferred pass, dynamic light sources won't cause big performance losses. All UNIGINE light source are dynamic except for the environment probe, which can be either dynamic or static.
• Static (precomputed) lighting is an efficient and useful solution for lighting of relatively static scenes. It allows dropping the most of lighting computations, leaving only simple texture lookups to be performed at the rendering time. Still, this method still only roughly simulate the lighting for the moving objects entering the scene and sometimes lack physical accuracy registered by the eye.

Light Source	Image	Dynamic Mode	Static Mode
LightOmni (omnidirectional point light)		Emits light from a point source in all directions.	-
LightProj (projected light)		Emits light from a single point forming a focused beam aimed in a specific direction.	-
LightWorld (sun light)		Casts parallel beams onto the scene from an infinitely remote point.	-
LightEnvironmentProbe (environment probe)		Grabs a cubemap each frame thus providing objects in the scene with dynamic reflections from a point source in all directions.	Uses a prebaked cubemap to provide objects in the scene with reflections from a point source in all directions.
LightVoxelProbe (voxel probe)		-	Provides volume to bake lighting. Uses a prebaked voxel map to provide objects in the scene with indirect lighting from any light source.

The basic workflow is to use dynamic light sources and Voxel Probes for lighting, and Environment Probes for reflections. This approach ensures the best result, however, you can also enable both lighting and reflections for a Voxel or Environment Probe via the corresponding options.

Light sources provide lighting to surfaces in the following priority:

1. Omni, Projected and World light sources' dynamic direct light.
2. Voxel probe's ambient light and/or reflection.
3. Environment probe's ambient light and/or reflection.

See Also