Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: Dionysios.TS on 2018-02-12, 17:53:45
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hi all,
I think I found a bug when on the objects properties in a scene we turn off both receive and cast shadows options.
If you do this and in the scene the other objects use glossy materials, the produce a very weird and strange artifact on their surfaces.
I am including an image and 3ds max scene if you need it. (2017)
Basically, in this simple example, the sky object has off both shadows options and the ground plane a reflection with glossiness.
Look at the strange oval dark shape here. If you change the glossiness value of the ground material, that shape changes as well.
I am not sure if this bug is related to the dimensions of the objects which are quite big, but imagine an exterior scene where the background plane is a background image applied on a tube or a plane....
Looking forward for your news...
Dionysios -
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If you miss some maps from the .max file I sent no worries, I forgot to turn off the Env. Overrides slots. In any case even with them off the problem is always produced here.
Thanks,
Dionysios -
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Looks like a couple of factors come into play here - e.g. if the plane material has no Diffuse, then the effect goes away. The dark area appears related to the area where the Sun is reflected on the plane.
The only way I could see to get around this was to use a CoronaLight material for the Tube object, which had to have Emit Light enabled, and Occlude Other Lights unchecked. (EDIT - which let me have Diffuse from the Sun, and Reflection from the Sun, and Reflection from the Tube, without the artifact appearing)
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This is a known problem with light transport when using fakes - https://coronarenderer.freshdesk.com/support/solutions/articles/5000516180-known-bugs-and-limitations
We would love to fix this, and we understand how important it is, but unfortunately it's a very hard thing to do.
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This is a known problem with light transport when using fakes - https://coronarenderer.freshdesk.com/support/solutions/articles/5000516180-known-bugs-and-limitations
We would love to fix this, and we understand how important it is, but unfortunately it's a very hard thing to do.
Thanks for getting back. No problem, if it's a known limitation we can live with this. Is important not to be a bug. :)
Dionysios -