What is a Light Probe Group and how does Unity use it?

• A. A Light Probe Group stores camera positions.
• B. A Light Probe Group is a collection of probes used to interpolate indirect lighting for dynamic objects across a scene.
• C. A Light Probe Group is a type of textureless shadow map.
• D. A Light Probe Group is only used for baking shadows.

Answer: (B)

Light probes are used to capture how light arrives in different parts of a scene and then apply that information to objects that move or aren’t baked into lightmaps. A Light Probe Group in Unity is a collection of these probe points arranged in space. At runtime, the system interpolates the indirect lighting for dynamic objects between nearby probes, using the data stored at each probe (often stored as spherical harmonics coefficients). This lets moving objects receive realistic bounced and ambient lighting that matches the environment, without needing per-object, pre-baked lightmaps.

It’s not about camera positions, not a textureless shadow map, and not limited to baking shadows. The purpose is to provide accurate indirect lighting for dynamic objects across the scene.