two glass issues

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daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

two glass issues

Post by daros » Sun Sep 05, 2021 9:10 am

Hi, i experiencing some strange behaviour with this geometry and glass material

geometry + physical glass material, rendered in maxwell
bug-maxwell.JPG

flipped geometry + physical glass material, rendered in maxwell
bug-maxwell flipped.JPG

geometry + physical glass material, rendered in luxcore
bug-luxcore.png

flipped geometry + physical glass material, rendered in maxwell
bug luxocre flipped.png
Attachments
bug.zip
(104.8 KiB) Downloaded 11 times
Last edited by daros on Sun Sep 05, 2021 11:41 am, edited 1 time in total.

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Sharlybg
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Re: two glass issues

Post by Sharlybg » Sun Sep 05, 2021 10:37 am

You may need to post the known geometry for efficient help.
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daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Sun Sep 05, 2021 11:41 am

Ops, sorry, i edited the previous post and added the file, thanks.

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Dade
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Re: two glass issues

Post by Dade » Sun Sep 05, 2021 11:56 am

It is not a closed surface: it is not a valid volume.
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daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Sun Sep 05, 2021 12:21 pm

But in complex projects it can be a huge pain for non professional modelers to archive perfectly cosed volumes for glazings like this:
final01_1.jpg
So it is a great + if the render engine can deal with them as maxwell does. The same is true for flipped glass surfaces.

Often this kind of 3D models arrive from nurbs based softwares which have even bigger issues in creating perfectly closed surfaces.

daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Mon Sep 06, 2021 7:07 am

now i get this with identical scene and geometry, only camera angle varies
luxA.JPG
luxB.JPG
Attachments
vetro1.zip
(2.75 KiB) Downloaded 7 times
vetro2.zip
(2.75 KiB) Downloaded 11 times

daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Mon Sep 06, 2021 7:13 am

this seems an issue of large glass surfaces with small thickness

daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Tue Sep 07, 2021 6:09 am

Is there a tolerance value which has to be lowered in order to get this kind of glass volume right?

kintuX
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Re: two glass issues

Post by kintuX » Tue Sep 07, 2021 10:02 am

What app do you use?
At what scale, size & units is your object rendered?

Your "bug.obj" geo, though relatively big (~20m high) renders fine with BlenLuxCore... :?
obj-bug_BlendLuxCore.jpg

daros
Posts: 166
Joined: Thu Dec 12, 2019 3:25 pm

Re: two glass issues

Post by daros » Tue Sep 07, 2021 11:20 am

interesting... are you using bidirectional? I think scale is meters, however it should be clear looking at the scene files i attached.
Yes, i revised it is in meters.

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