Weird shadow lines on plain surfaces of mesh

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Soundwave2142
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Weird shadow lines on plain surfaces of mesh

#1 Post by Soundwave2142 » 31 Jan 2021 12:53

Hi, can anyone point out why am I getting this weird shadow lines? It is mostly visible during sunsets when sun shines on plain surfaces
DAF 105 by SCS doesn't seems to suffer this from this problem much, even thought it has similar plain surfaces.

Any ideas how to at-least reduce this issue?

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My mods:
Fruehauf VFK Tipper Trailer

Currently working on:
DAF 95XF

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Etrusan
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Re: Weird shadow lines on plain surfaces of mesh

#2 Post by Etrusan » 31 Jan 2021 12:57

Might be self-shading, try to give the shadow material negative bias (-0.5 works somewhat ok).
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Soundwave2142
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Re: Weird shadow lines on plain surfaces of mesh

#3 Post by Soundwave2142 » 31 Jan 2021 13:22

**Rule 2.12**

I don't have a shadow option on in any of my materials. However I tried ticking it on right now, just for testing, doesn't seems to effect anything, also I can't enter a negative value in shadow bias in blender.

Here's how (that blue panel) material looks like (and most of them too):
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My mods:
Fruehauf VFK Tipper Trailer

Currently working on:
DAF 95XF

Dotec
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Re: Weird shadow lines on plain surfaces of mesh

#4 Post by Dotec » 31 Jan 2021 13:37

for negative value:

open io_scs_tools/properties/material.py and go to line 633
change this line

min=0.0,

to

#min=0.0,

save and try again
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Soundwave2142
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Re: Weird shadow lines on plain surfaces of mesh

#5 Post by Soundwave2142 » 31 Jan 2021 14:04

As I said, none of my materials had shadow flavor on (so "self-shading" shouldn't be a thing, right?). However I did as you said and created new dif.spec material with shadow flavor and bias set to both -0.5 and -0.05. Mesh still suffered same effect, nothing seems to have changed

Etrusan wrote:
31 Jan 2021 12:57
Might be self-shading, try to give the shadow material negative bias (-0.5 works somewhat ok).
Sorry, it seems I misunderstood you. When you said "shadow material" and "self-shading" I thought of materials that has shadow flavor. However setting -0.05 to my mesh that has shadow shader (and acts like shadow caster) fixed the issue.

Thank both of you for the assist.
Last edited by supersobes on 31 Jan 2021 18:36, edited 2 times in total.
Reason: Double post merged [Forum rule 2.5] Removed quote [Forum rule 2.12]
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Fruehauf VFK Tipper Trailer

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ONURKULL
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Re: Weird shadow lines on plain surfaces of mesh

#6 Post by ONURKULL » 02 Feb 2021 11:10

Try add "weighted normal" modifier to which parts look weird.

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Soundwave2142
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Re: Weird shadow lines on plain surfaces of mesh

#7 Post by Soundwave2142 » 02 Feb 2021 16:25

Already mentioned the fix in post above, doubt normal weight has anything to do with the issue I had.
Last edited by Madkine on 02 Feb 2021 19:57, edited 1 time in total.
Reason: Rule 2.12
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My mods:
Fruehauf VFK Tipper Trailer

Currently working on:
DAF 95XF

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