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square artifacts (in interior mode?)

Hi folks,

i encountered some issues with an animation. Out of 101 frames 46 look like the attached one. They get seemingly inverse coloured square artifacts all over. The attached one is the worst of them all, some are artifacted to a lesser degree or more monochromatic. In final render output the squares on most images get black, but in the viewport or render preview they are always colourful like shown.

up on request i could share the .ksp - but i as well opened a support ticked where i attached the .ksp for the luxion team

there are 5 physical light sources: an area light + a spotlight, both animated with a fade curve and colour fade. The Spotlights poition is animated as well. And 3 area lights static in the light. Turning all animations off provided the same results.

its rendered without caustics, in interior mode. 30 samples with denoise at .4 . The Artifacts get worse with more samples though. And they do seem to not appear in product mode.


MacPro 2019

MacOS 10.15.4

Keyshot 9.3.14

AMD Radeon 580X Pro 

Intel Xeon

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I reported this april, 3 months ago. For a big this serious I find it unacceptable that it has not been fixed.

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This has also been happening on my 2019 Macbook Pro running Catalina 10.15.5

2.4GHz 8 core i9


AMD Radion Pro 5500M 8GB 

This is after deleting the xml file as mentioned above. In viewport it kicks in around 30 samples, but in exports, it starts at 3 samples. 

This is a single body model with a simple plastic material with 0.1 roughness


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Hello Jonathan,

Thank you for contacting Luxion.
This issue has only been seen on macOS, and has FINALLY been solved in the KeyShot 10 release.

I would recommend contacting our Sales Department at and explain to them the situation. This is a serious bug and our customers should not be punished for it. A Sales representative will do everything they can to get you updated to KeyShot 10.

Thank you for your patience during all of this.
If there is anything we can do for you in Support to help, please let me know 

Referencing your Ticket ID#:11042


Med Venlig Hilsen / Best Regards,

Erik Williams
Customer Support Specialist

1 person likes this

also have this issue but the squares are black.


i am on a MacBook Pro with BigSur and on a floating license of Keyshot 9

any help would be appreciated.

This is solved in Version 10!

thanks for the update - crossing fingers that this is true :)

i will let you know if this persists once i have V10 installed and running.


I updatet to Vs10 and the artifacts are gone. (Mac Pro 2019) A great update in functionality too. Support for 3dconnexion spacemouse is added too.

Hi Erik,

I just have sent you my KS9Settings.xml file.

I just tried to render a interior scene again  that I have rendered some days ago, but today I got the artifacts - it's like gambling

(1.21 MB)
Hello, I get these black squares when rendering too. The squares are created when calculating the 2nd sample in export mode - not in live rendering.  The squares has dimension of 16x16 pixels. Where there are no objects in the picture there will be no squares (see left marginal are of screenshots). if I start the render job several times, the squares always appear at different (random?) positions and sometimes not at all. If I reduce the number of cores, more black squares will be calculated (see 2nd Screenshot).  If I reduce ray-bounces to zero there are no squares.

My Hardware:
Mac Pro 2019 16 Core Xeon W3245
AMD Radeon Pro W5700X 16GB
Lightning: Interior
Keyshot actual version

My ideas: Intel Xeon TurboBoost Max 3.0 drives CPU-cores at different speeds - so some segments are not ready when others are finished? Especially when calculating ray-bounces?

Hello Jonathan,

I am following on this issue. 
Were you using the sun and sky environment when you come across this issue?

Referencing your Ticket ID#:11042


Med Venlig Hilsen / Best Regards,

Erik Williams
Customer Support Specialist
Hi, No it was using a physical spotlight and regular hdri, and also using an hdri only.
Hello Jonathan,

Thank you for contacting Luxion.
We have noticed an issue in the platform with interior mode artifacts on Mac computers.
What type of KeyShot license are you using, HD, Pro, Education, etc?

Referencing your Ticket ID#:11042


Med Venlig Hilsen / Best Regards,

Erik Williams
Customer Support Specialist
Yes we're still looking into why this is happening, but if you can send me a ksp of your scene it would help us figure out exactly what is going on.

Please send us your scene as a ksp file.
To save a ksp file:
  1. Open your scene.
  2. Go to File > Save Package.
  3. Name your file.
  4. Include Ticket number.

You may send it securely via our WeTransfer

After you send us the ksp, you can solve this issue by browsing to:
/Library/Application Support/KeyShot9

From here, find the file KS9Settings.xml. Delete this file and you should be good to go.
Let us know what happens.

Referencing your Ticket ID#:11042


Med Venlig Hilsen / Best Regards,

Erik Williams
Customer Support Specialist

ive sent you the file.

the fix deleting the Settings.xml worked the first time for about 10 frames, the secodn time it didnt work at all: even the viewport got artifacts. 

thanks nonetheless :)

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