Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: maru on 2014-03-04, 19:04:35

Title: Different noise from different light sources
Post by: maru on 2014-03-04, 19:04:35

I suppose it's not a bug, but I'd like to hear some explanations why this happens. From left: sphere with CoronaMtl, sphere with CoronaLightMtl, spherical CoronaLight. LSM was set to 1.

Title: Re: Different noise from different light sources
Post by: Ondra on 2014-03-04, 19:10:06

yep, spherical CoronaLight is better, that is expected behavior, since it is analytical sphere, not polygonal

Title: Re: Different noise from different light sources
Post by: racoonart on 2014-03-04, 19:11:23

Left is coronaMtl with selfillumination? If yes then it's simply GI noise (means: rays are not shot to the lightsource but everywhere and don't hit the sphere all the time -> more noise)
Middle: more noise because your mesh light is sampled per polygon (like many little triangular lights)
Right: perfect mathematical sphere, so it can be sampled a lot better

Title: Re: Different noise from different light sources
Post by: maru on 2014-03-04, 19:47:23

Understood.