mehmetcank

1 answer · asked · Lesson: Light Probes · Course: Fundamentals of Lighting

I'm not understanding light probes too well. I thought we were trying to make it so that the red sphere would be emitting ...

I'm not understanding light probes too well. I thought we were trying to make it so that the red sphere would be emitting its light to its surroundings, however, with the light probe and its individual probes it seems like the emitted light only reaches the moving objects from the direction of the probes and not our sphere. I thought we wanted the red sphere to emit light from its position, from the exact position that it is at, like a sun emitting from one location. My other misunderstanding is that looks like the probes are kind of like light duplicators, where they enhance and give off light that they receive from their surroundings - is that right? I tried to create a blue sphere and add a light probe to have it reflect blue, so that when a moving object getting closer would reflect blue light (instead of the red), but that didn't happen. The second light probe object was linked to the first, red light probe object, and that's the only light that seems to be reflected in my scene. Thanks!
  • crew
    Yes you're right the light probes basically just "catch" the light within the light probe group and apply it to moving objects. Light probes don't actually emit light or anything like that they just sample the light in a given area and apply it to anything that is using them. Make sure your blue sphere is emitting light. It can only emit light if it is set to static. Unfortunately if it's moving you can't emit light using emission maps. After that make sure you have a light probe group that can reach both the blue sphere and your moving object and assign the light probe group to the moving object. Also make sure that your red sphere isn't super bright otherwise it'll wash out any blue light being cast onto other objects. I believe the red sphere used in the tutorial is set pretty high. Hope that helps. Light probes can be a bit weird to understand but all it's doing is sampling light and passing that info to moving objects.