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Furnace test fails when specTrans ~ 0.5 #78

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knightcrawler25 opened this issue Dec 22, 2022 · 0 comments
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Furnace test fails when specTrans ~ 0.5 #78

knightcrawler25 opened this issue Dec 22, 2022 · 0 comments
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knightcrawler25 commented Dec 22, 2022 •
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specTrans ~ 0.5 causes furnace test to fail when a high ray depth is used (>10 bounces)

furnace.zip

box

A nice discussion on handling back faces: https://groups.google.com/a/arnoldrenderer.com/g/standard.surface/c/9agBPBEkMV4

Mitsuba 3 disables sampling of diffuse/clearcoat/sheen for the interior to overcome a similar issue (mmp/pbrt-v3#313) but loses energy and ends up darker.

furnace_mitsuba.zip

Mitsuba 3 (Allowed sampling all lobes for interior):

box_new

Mitsuba 3 (Original repo):

box

Cycles does not suffer from the same issue: Cycles.zip

Cycles
@knightcrawler25 knightcrawler25 added the bug Something isn't working label Dec 22, 2022
@knightcrawler25 knightcrawler25 changed the title Furnace test fails when specTrans < 1.0 Furnace test fails when specTrans ~ 0.5 Dec 22, 2022
@knightcrawler25 knightcrawler25 mentioned this issue Mar 5, 2023
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