【Light Probe】

　　Light Probes provide a way to capture and use information about light that is passing through the empty space in your scene.

　　Similar to lightmaps, light probes store “baked” information about lighting in your scene. The difference is that while lightmaps store lighting information about light hitting the surfaces

　　To place Light Probes in your scene, you must use a GameObject with a Light Probe Group component attached.

　　Light Probe網絡必須形成3D空間。平面網絡是無效的。如下左圖基本是無效的，右圖才是有效的。

　　Unity’s realtime GI allows moving lights to cast dynamic bounced light against your static scenery. However, you can also receive dynamic bounced light from moving lights on moving GameObjects when you are using llight probes.

　　Realtime GI允許動態光源投影反射光到靜態場景上。Light Probe允許動態動態光源投影反射光到動態場景上。

　　Light Probes therefore perform two very similar but distinct functions - they store static baked light, and at runtime they represent sampling points for dynamic realtime global illumination (GI, or bounced light) to affect the lighting on moving objects.

　　可以通過代碼來添加LightProbe.

  LightProbeGroup lightProbeGroup = GetComponent<LightProbeGroup> ();
  List<Vector3> positions = new List<Vector3> ();
  lightProbeGroup.probePositions = positions.ToArray ();

　　Lightmapping adds greatly to the realism of a scene by capturing realistic bounced light as textures which are “baked” onto the surface of static objects. However, due to the nature of lightmapping, it can only be applied to non-moving objects marked asLightmap Static.

　　While realtime and mixed mode lights can cast direct light on moving objects, moving objects do not receive bounced light from your static environment unless you use light probes.

　　To use Light Probes on your moving GameObjects, the Mesh Renderer component on the moving GameObject must set correctly.

Light Probe