Shadow smooth?

Development Rendering
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1

Hello, i’ve been using UE 4 for 7 month, and the following problem was noticed around 5-10 times
This is… Shadow smooth? I don’t know exactly what it is, but it seems to appear only a several times and i still don’t know why. Here’s image of it. Cycles render: link text ; Unreal: link text
In cycles render there’s no thing like that (why?), mesh have smoothing groups which was imported correctly i belive. (without casting shadows these polygons can’t be seen)
So it happens because of light in Unreal as i found, but it still don’t work, anyone know how to fix that?

Edit: If only self shadows enabled, everything is fine. Seft shadow: http://prntscr.com/b0wf1e
World shadow: http://prntscr.com/b0wf8u
/ (Mesh is hollow).
None of any light components setting can’t affect it

2

There have been a few reports of bugs in the FBX importer in 4.11. Could you perhaps import this mesh in an earlier engine version to see if the issue shows up there too?

3

I’ve tried, but it seems like there’s the same issue on 4.10.4

4

Could you perhaps share the model (the full mesh or just the dish) so I can take a closer look?

5

Aight, here they are: https://yadi.sk/d/WT-7rpYYrUWrg ,
this one looks the same way: https://yadi.sk/d/gsO0Y5DZrUWtr

6

The first link doesn’t work. The second does have some faceting on the top polygons but it also gets imported with a warning in the message log:

Warning Warning: No smoothing group information was found in this FBX scene.  Please make sure to enable the 'Export Smoothing Groups' option in the FBX Exporter plug-in before exporting the file.  Even for tools that don't support smoothing groups, the FBX Exporter will generate appropriate smoothing data at export-time so that correct vertex normals can be inferred while importing.

Try to export the mesh with smoothing groups.

7

I’m exporting it with blender, setting smooth on ‘edge’ (after mark all needed faces to smooth and sharp edges, also activating auto smooth to 180 degrees), just like hundred times before, and now it doesn’t seems to work :frowning:
Maybe i’ll figure it out a bit later randomly, but now i don’t know what to do

8

This is not ‘right’ solution, as i think, but it works: In mesh setting, enabling ‘Dynamic Inset Shadow’ seems to entirely resolve problem, but i never used this opton before and for all of my meshes this option is disabled, and they haven’t this shadow problem even now, that’s why i think it’s not best solution. It actually just reduces shadow resolution so you can’t see thus bug. Anyway, for now it works, hope it helped someone. /
DIsabled: http://prntscr.com/b0wl28
Enabled: http://prntscr.com/b0wnl1
(This answer doesn’t resolve problem)