Light Probe (Light Probe) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). A system in which surrounding light information (color and intensity) is recorded in advance on a grid-like point (sphere) in space, and a high-speed approximation of the surrounding pre-baked light is applied to a dynamic character (player, etc.) that moves between them.
An example in the real world: A system where ``air sensors (probes) that measure the color of light'' are floating around the room, and the moment a character passes by, the ``value of the nearest sensor'' is blended with the character's skin and light is applied
Light Probe is a system that floats countless invisible ``balloons (probes) of light measuring instruments'' in a grid pattern in the air in 3D space.'' The balloon stores in advance light data in the air as spherical data, such as ``Here the red neon light is strong, and here the blue light from the window reaches here''. When the character (player) walks between the balloons, the data from the four surrounding balloons are smoothly mixed (interpolated) according to the character's current location, and the character's entire body is instantly recreated with beautiful light and shadow that perfectly blends into the space.
Figure: An infographic that clearly illustrates the basic processing flow and mechanism of Light Probe (Light Probe) in Japanese notation
Detailed mechanism and operating principle
Place the "Light Probe Group" component in the scene, and bake by finely scattering light sensor points (probes) on the path where the character moves and the boundary line where the light source changes.