The percentage of rays shot from a ray origin that must hit front faces to be considered usable.
The precompute calculates visibility from ray origins to clusters, but attempts to reject ray origins that are inside geometry. If the percentage of rays that hit front faces is less than backFaceTolerance, the ray origin is marked invalid and will not affect the radiosity computation.
For example, if backFaceTolerance is 0.0, the ray origin is rejected only if it sees nothing but backfaces. If 1.0, the ray origin is rejected if it has even one ray that hits a backface.
This setting can help control light leaking, but should be considered in the context of the mesh authoring workflow. Preventing the rejection of ray origins by setting a value of 0.0 will ensure Enlighten does not reject ray origins due to single-sided geometry. However, if the majority of the meshes are closed, so visible backfaces are rare, a positive value can reduce light leaking or darkening that intersecting geometry would otherwise cause.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.