Shadow Terminator problem

Discussion related to the Engine functionality, implementations and API.
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Dade
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Re: Shadow Terminator problem

Post by Dade » Wed Nov 27, 2019 2:48 pm

Based on Appleseed workaround: https://github.com/skwerner/blender/com ... 1be6a29bd1

I don't think it has an high priority at the moment but something to keep an eye on.
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Sharlybg
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Re: Shadow Terminator problem

Post by Sharlybg » Wed Nov 27, 2019 2:54 pm

Our current Velvet shader seem to have some shadow terminator issue even without bump map. have to find time to investigate.
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Racleborg
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Re: Shadow Terminator problem

Post by Racleborg » Wed Nov 27, 2019 4:29 pm

Sometimes, tweaking the 'Advanced' settings or making the light source larger appears to fix this. Also, it can be really sensitive to whether of not there is enough Sub-divisions. I don't understand why, but that's how I've been using it.

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Egert_Kanep
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Re: Shadow Terminator problem

Post by Egert_Kanep » Wed Nov 27, 2019 4:56 pm

Is shadow terminator treated automatically or are there any settings to turn it on?

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Sharlybg
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Re: Shadow Terminator problem

Post by Sharlybg » Wed Nov 27, 2019 5:08 pm

Racleborg wrote:
Wed Nov 27, 2019 4:29 pm
Sometimes, tweaking the 'Advanced' settings or making the light source larger appears to fix this. Also, it can be really sensitive to whether of not there is enough Sub-divisions. I don't understand why, but that's how I've been using it.
i do the same but this is not normal. a single shader shouldn't completely dictate your lighting preference ;)
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Racleborg
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Re: Shadow Terminator problem

Post by Racleborg » Wed Nov 27, 2019 5:20 pm

i do the same but this is not normal. a single shader shouldn't completely dictate your lighting preference ;)
I agree, and even though I really like the Velvet shader it has been a bit hit and miss at times. The settings aren't labelled very definitively and are described as 'abstract'(or something like that) which may not be helping matters.

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Dade
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Re: Shadow Terminator problem

Post by Dade » Wed Nov 27, 2019 7:05 pm

Egert_Kanep wrote:
Wed Nov 27, 2019 4:56 pm
Is shadow terminator treated automatically or are there any settings to turn it on?
It is always enabled (if you use bump/normal mapping, the topic of this thread, not the last link I posted).
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Mango3
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Re: Shadow Terminator problem

Post by Mango3 » Thu Nov 28, 2019 7:22 am

Egert_Kanep wrote:
Wed Nov 27, 2019 4:56 pm
Is shadow terminator treated automatically or are there any settings to turn it on?
Just to clarify. The appleseed fix is not automatic, one can set a numeric correction factor (part of the object modifier) for the affected object.
It is not dependent on bump mapping and works on general low poly objects.

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Re: Shadow Terminator problem

Post by kintuX » Mon Dec 02, 2019 9:41 pm

From what I saw, it produces really good and expected results. Hope one day to see it land in LuxCore. 8-)

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