Hello everyone.
The shadow shifts on low poly objects. This is very noticeable on tree branches, on sofas and when the normal map is used. The normal map begins to work aggressively in places with bends and a low number of polygons. A black outline appears on the branches of trees. It is clearly visible on Megascans models, an example is provided by the user cjwidd in this topic https://forum.corona-renderer.com/index.php?topic=31748.15. Changing the Shadow shift value to 0.5 partially solves this problem, but then we get grid artifacts. I made some examples with captions and comparisons
corona-8-3dsmax-daily-2021-07-28 | 3dsmax 2021.3
Hi, is this in any way related to Corona 8? Is it any different in Corona 7, 6, or older?
As you correctly noted, we do this to get rid of the sharp blocky shadows on low poly geometry.
When this feature is off - the blocky shadows will be visible.
When this feature is on - the blocky shadows will not be visible, but the shading will be slightly different.
The assumption is that the shading difference is not noticeable in most cases, and its drawbacks are less important than the sharp blocky shadows. One thing I can recommend is not using low-poly objects. This generally isn't a good idea since they are not realistic.
Is this any different in other renderers?