random dots appear on my walls

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lilian_twilight
Posts: 2
Joined: Wed Oct 23, 2019 9:05 am

random dots appear on my walls

Post by lilian_twilight » Wed Oct 23, 2019 9:20 am

Hi Everyone,

I am a first-year Twilight Render user. I have been using Twilight Render for school works and personal projects for almost a year now, but lately, I have problems with almost every rendering where random dots appear on my walls and ceilings. As seen in the image attached.

I came across a post that advised to avoid the "+" sign settings just use "high" or "medium", but it does not seem to work for me.

Any ideas on how can I fix the problem? Thank you in advance for your help.
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擷取.JPG
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Fletch
Posts: 10731
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2018-2019
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Re: random dots appear on my walls

Post by Fletch » Wed Oct 23, 2019 12:35 pm

:welcome:

You are correct that it's a caustics issue.

You must disable caustics for the "High" render setting. Or increase the quality of the caustics from 512 to something like 2048 or more. (This depends on the scene lighting and materials as well as the image resolution.)
Screenshot 2019-10-23 14.31.21.png
Screenshot 2019-10-23 14.31.21.png (146.89 KiB) Viewed 90 times
The 04. Medium render setting does not have caustics enabled by default. But the Easy 05, 06, 07 render settings does have caustics enabled.

The easiest answer is either render with Easy 04 or if you want high quality use Easy 09 (which, in the end is likely faster than Easy 06 or 07). It may start slowly, but, depending on your computer, Easy 09 should give you a very nice image in about 2 hours - less than Easy 06 or 07 would probably give in the case you are showing here.

The following image was rendered in 2 hours on Easy 09 render setting on a Corei7 laptop at HD 1080p resolution. (some post pro Denoise performed with Topaz denoise plugin for Photoshop)
Subject: Kitchen Image

lilian_twilight
Posts: 2
Joined: Wed Oct 23, 2019 9:05 am

Re: random dots appear on my walls

Post by lilian_twilight » Thu Oct 24, 2019 7:04 am

Thank you, Fletch, for your time and reply.

But I looked everywhere and see no access to the setting dialog. Could you please guide me there? Thank you.
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justify
Posts: 1
Joined: Fri Feb 08, 2019 10:28 am

Re: random dots appear on my walls

Post by justify » Thu Nov 07, 2019 4:07 pm

Why is it?

Fletch
Posts: 10731
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2018-2019
Contact:

Re: random dots appear on my walls

Post by Fletch » Thu Nov 07, 2019 4:37 pm

Hobby users can edit the settings, they need to open them in a notepad editor and save as .xml
Pro users can do this from within Twilight, it's one of the many perks of having the pro version.
Pro users are more likely to need to tweak render settings. Hobby users are less likely.

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