Chaos Corona for 3ds Max > [Max] Bug Reporting

Simple shadow problem with Corona 8

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andreu.taberner:
Hi!

Shadows doesn´t render correctly when a map is addded to the Refl.Glossiness.
The shadow improves as I reduce the amount of the refl. glosiness map. This improvement seems to be affected by the distance to the object casting the shadow.

See attached image.

Notes:
The shadow comes from a proxy tree in this example, but the problem occurs with regular objects as well.

Software:
-3ds Max 2022
-Corona 8

maru:
This is not a Corona 8 specific problem. It would render the same in Corona 7 and older.

Please see:
https://forum.corona-renderer.com/index.php?topic=36152.msg197618#msg197618
https://forum.corona-renderer.com/index.php?topic=25017.msg150330#msg150330
https://forum.corona-renderer.com/index.php?topic=32392.msg181903#msg181903

andreu.taberner:
I did some quick tests.

My conclusion is that any changes on Object properties as Cast shadows or Visible to Refractions/Refractions will create wrong results on top of objects with a Glossiness different that 1,0 (regardless if it is a map or just a number). it will basically show shadows, more or less dense, while Cast Shadows is unchecked.

This is a significant problem in archviz, especially for those planning to create fake shadows or fake reflections inside the 3D scene, to later add objects, like trees, in Photoshop.

DelightingPictures:
In the case of Corona Render 8, the same happens to us, but if you change the ground material to a Physical material, the shadows will appear correct. Try it and let us know if it improves. In our case, I think it happens without having objects hidden from the camera.

https://forum.corona-renderer.com/index.php?topic=36714.0

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