Problem with pathtracing on Blender 3.1 & Luxcore 2.6

[Fomhorian]

.blend file:

Steps to reproduce: When using Luxcore in pathtracing mode the caustics from a transparent object doesn't show on a base surface, unless you flip the normal(s) of the base surface. Bidir works perfectly.

Screenshots or rendered images:

Error message from Blender console: None.

OS: Win10 Blender version: 3.1 (& 3.01, possibly 2.93) LuxCore version: 2.6 (& 2.5, don't know/remember about 2.4)

[Fomhorian]

The lower image has the "base surface", a cube, with its normals inverted. Hence the yucky beige & flat shading.

[foreachthing]

Silly question: do you have "Light Tracing" in "Render Properties -> Light Paths" active?

[Fomhorian]

Yup. Always. I generally don't goof around with the settings. I tried switching LightTracing off because of your mail, but apart from some serious fireflies, I still don't see any caustics akin to the bidir ones.

Sincerely, T. Sandberg

Den mån 21 mars 2022 22:27foreachthing @.***> skrev:

Silly question: do you have "Light Tracing" in "Render Properties -> Light Paths" active?

— Reply to this email directly, view it on GitHub https://github.com/LuxCoreRender/BlendLuxCore/issues/758#issuecomment-1074438124, or unsubscribe https://github.com/notifications/unsubscribe-auth/AYKV6ANQR43LKQTAWL3UDMTVBDSUJANCNFSM5RIOME5Q . You are receiving this because you authored the thread.Message ID: @.***>

[foreachthing]

I said it was a silly question 😄 Oh, I just checked, I got 2.61a0 installed. Maybe that made all the difference?!

[Fomhorian]

I got the latest build, 2.61a, too.😵‍💫

Den mån 21 mars 2022 23:04foreachthing @.***> skrev:

I said it was a silly question 😄 Oh, I just checked, I got 2.61a0 installed. Maybe that made all the difference?!

— Reply to this email directly, view it on GitHub https://github.com/LuxCoreRender/BlendLuxCore/issues/758#issuecomment-1074465643, or unsubscribe https://github.com/notifications/unsubscribe-auth/AYKV6ALA6MKX5U4SPZ7RCO3VBDXAFANCNFSM5RIOME5Q . You are receiving this because you authored the thread.Message ID: @.***>

[foreachthing]

Please try the simplest scene of'em all: Blender 3.1 and LuxCore 2.61a0

Suzanne.zip

If that doesn't help, maybe you can upload your .blend?

[Fomhorian]

I found the culprit!!! When I add the material "Glossy Coating" to a base material; that's when PathTracing fails to produce caustics on that surface! =D

Sincerely, T Sandberg (Yet again a happy toddler😁🐣)

PS: I tried to add a Blend-file (at 4.5 mB), but the mail-system considered it too large! :DS

Den tis 22 mars 2022 kl 07:42 skrev foreachthing @.***>:

Please try the simplest scene of'em all: [image: image] https://user-images.githubusercontent.com/10420187/159422587-6d3bedcf-556e-47ae-b737-1c0204e57449.png Blender 3.1 and LuxCore 2.61a0

Suzanne.zip https://github.com/LuxCoreRender/BlendLuxCore/files/8321776/Suzanne.zip

If that doesn't help, maybe you can upload your .blend?

— Reply to this email directly, view it on GitHub https://github.com/LuxCoreRender/BlendLuxCore/issues/758#issuecomment-1074793952, or unsubscribe https://github.com/notifications/unsubscribe-auth/AYKV6AMEADZK24RXPUTMOFLVBFTWRANCNFSM5RIOME5Q . You are receiving this because you authored the thread.Message ID: @.***>

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[foreachthing]

@Fomhorian, upload the zip on the website. Good you found the issue.

But ... Disney and glossy works (unless I am doing something wrong)

AND, carpaint! Carpaint doesn't want to work with glossy!

What are your thoughts?!