glossy translucent and bump

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lacilaci
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glossy translucent and bump

Post by lacilaci » Tue Aug 20, 2019 11:51 am

Is bump mapping not supposed to work with glossy translucent material? Seems the moment I plugin bump map to glossy translucent the shader looses translucency

bump off:
palm_nobump.png
bump on:
palm_bump.png

provisory
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Re: glossy translucent and bump

Post by provisory » Thu Aug 22, 2019 8:45 am

I confirm lacilaci's finding, that Glossy Translucent doesn't work together with bump maps.
It works with the June 26 version of LuxCore, but does not with the Aug 8 version.
Matte Translucent is equally affected.

It can be reproduced with example scene Procedural Leaves:
https://github.com/LuxCoreRender/LuxCor ... Leaves.zip

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Dade
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Re: glossy translucent and bump

Post by Dade » Thu Aug 22, 2019 3:46 pm

Do you have a simpler test scene ? Something with a plane and a simple bump map image.

I'm looking into the linked scene but it is a complex material setup, if I replace glossy translucent with just matte, I still get an odd result:

test.jpg

The black leaf looks like something with flipped normals. I need a simpler set up.
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lacilaci
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Re: glossy translucent and bump

Post by lacilaci » Thu Aug 22, 2019 4:31 pm

I'll make a small example scene tomorrow..

kintuX
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Re: glossy translucent and bump

Post by kintuX » Thu Aug 22, 2019 4:47 pm

Why this ain't OK :?
test scene "ProcedurelLeaves"
luxcore bumpy leaf translucent glossy.jpg

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Re: glossy translucent and bump

Post by provisory » Thu Aug 22, 2019 4:52 pm

Dade wrote:
Thu Aug 22, 2019 3:46 pm
The black leaf looks like something with flipped normals. I need a simpler set up.
The three leaves share the same mesh data and the "black" one is scaled -1 on one axis to produce more variability.

You could just delete that one.

(I'm away from my computer at the moment, but will be back soon, and make a simple scene if still needed.)

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Dade
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Re: glossy translucent and bump

Post by Dade » Thu Aug 22, 2019 5:15 pm

provisory wrote:
Thu Aug 22, 2019 4:52 pm
Dade wrote:
Thu Aug 22, 2019 3:46 pm
The black leaf looks like something with flipped normals. I need a simpler set up.
The three leaves share the same mesh data and the "black" one is scaled -1 on one axis to produce more variability.

You could just delete that one.

(I'm away from my computer at the moment, but will be back soon, and make a simple scene if still needed.)
This may be a big hint on where is the problem (-1 scale) but it would be a lot easier to investigate with a simpler scene.
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provisory
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Re: glossy translucent and bump

Post by provisory » Thu Aug 22, 2019 5:47 pm

Dade wrote:
Thu Aug 22, 2019 5:15 pm
...it would be a lot easier to investigate with a simpler scene.
Here is a simple test scene.
Attachments
translucent-vs-bump.blend
(2.67 MiB) Downloaded 14 times
Last edited by provisory on Thu Aug 22, 2019 6:02 pm, edited 1 time in total.

kintuX
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Re: glossy translucent and bump

Post by kintuX » Thu Aug 22, 2019 6:02 pm

Oh, I see - Bump output "kills" Translucency :shock:

Image

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Dade
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Re: glossy translucent and bump

Post by Dade » Fri Aug 23, 2019 7:27 am

provisory wrote:
Thu Aug 22, 2019 5:47 pm
Dade wrote:
Thu Aug 22, 2019 5:15 pm
...it would be a lot easier to investigate with a simpler scene.
Here is a simple test scene.
I get this rendering with glossy translucent:

t.jpg

and this with matte:

m.jpg

where is the problem in glossy translucent ?
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