LuxCoreRender Forums

bidir vs Photon GI (CPU)

Some tests which do not make me wiser.
All glass surfaces have white shadow.

Bidir Photon GI

Bidir Photon GI

Those are my photon Gi settings:

light.maxdepth 64
path.maxdepth 256
sampler.metropolis.maxconsecutivereject 512
renderengine.type "PATHCPU"
sampler.type "SOBOL"
film.filter.type "NONE"
lightstrategy.type "LOG_POWER"
sampler.metropolis.largesteprate 0.4
sampler.metropolis.imagemutationrate 0.10000000000000001
film.filter.width 1.5
film.opencl.enable 0
path.forceblackbackground.enable 0
filesaver.renderengine.type "BIDIRCPU"
filesaver.format "TXT"
path.clamping.variance.maxvalue 200000
scene.epsilon.min 0.000001
scene.epsilon.max 0.1
path.albedospecular.type "REFLECT_TRANSMIT"
path.albedospecular.glossinessthreshold 0.05
path.photongi.photon.maxcount 20000000
path.photongi.photon.maxdepth 64
path.photongi.glossinessusagethreshold 0.049
path.photongi.indirect.enabled 1
path.photongi.indirect.maxsize 0
path.photongi.indirect.haltthreshold 0.05
path.photongi.indirect.lookup.radius 0
path.photongi.indirect.lookup.normalangle 10
path.photongi.indirect.usagethresholdscale 8
path.photongi.caustic.enabled 1
path.photongi.caustic.maxsize 1000000
path.photongi.caustic.lookup.radius 0.025
path.photongi.caustic.lookup.normalangle 10
path.photongi.caustic.updatespp 8
path.photongi.caustic.updatespp.radiusreduction 0.96
path.photongi.caustic.updatespp.minradius 0.003
path.photongi.persistent.file -------
path.hybridbackforward.enable 1
path.hybridbackforward.partition 0.8
path.hybridbackforward.glossinessthreshold 0.1

Some reflections are responding in a very different way wen using photon gi.

by the way here a photon GI panorama:
https://momento360.com/e/u/d42006191986 ... size=large

daros wrote: ↑Thu Jul 21, 2022 1:44 pm photon GI panorama

Awesome stuff!

In the second example I wonder why Pgi loose so much brightness compare to Bidir.
Different clamping Value ?

hi Sharlybg, those are my settings in bidir:
light.maxdepth 64
path.maxdepth 256
sampler.metropolis.maxconsecutivereject 512
renderengine.type "BIDIRCPU"
sampler.type "METROPOLIS"
film.filter.type "NONE"
lightstrategy.type "POWER"
sampler.metropolis.largesteprate 0.4
sampler.metropolis.imagemutationrate 0.10000000000000001
film.filter.width 1.5
film.opencl.enable 0
path.forceblackbackground.enable 0
filesaver.renderengine.type "BIDIRCPU"
filesaver.format "TXT"
path.clamping.variance.maxvalue 2000000000000000000
scene.epsilon.min 0.000001
scene.epsilon.max 0.1
path.albedospecular.type "REFLECT_TRANSMIT"
path.albedospecular.glossinessthreshold 0.05

interestingly in the second photon gi example the left wall is darker while the right /glass/chrome wall is brighter