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Chaos Corona Forum
Chaos Corona for 3ds Max
[Max] Bug Reporting
[Max] Resolved Bugs
Different noise from different light sources
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Topic: Different noise from different light sources (Read 1829 times)
2014-03-04, 19:04:35
maru
Corona Team
Active Users
Posts: 12768
Marcin
Different noise from different light sources
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.
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Marcin Miodek |
chaos-corona.com
3D Support Team Lead - Corona |
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2014-03-04, 19:10:06
Reply #1
Ondra
Administrator
Active Users
Posts: 9048
Turning coffee to features since 2009
Re: Different noise from different light sources
yep, spherical CoronaLight is better, that is expected behavior, since it is analytical sphere, not polygonal
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2014-03-04, 19:11:23
Reply #2
racoonart
Active Users
Posts: 1446
Re: Different noise from different light sources
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
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Any sufficiently advanced bug is indistinguishable from a feature.
2014-03-04, 19:47:23
Reply #3
maru
Corona Team
Active Users
Posts: 12768
Marcin
Re: Different noise from different light sources
Understood.
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Marcin Miodek |
chaos-corona.com
3D Support Team Lead - Corona |
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Chaos Corona Forum
Chaos Corona for 3ds Max
[Max] Bug Reporting
[Max] Resolved Bugs
Different noise from different light sources