arnaud giret

arnold_FR

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Recent Forum Posts

Bidirectional Path tracing in Mantra ? Feb. 2, 2020, 1:59 p.m.

Thanks a lot Tomas for your answer,
i will try those integrators you mentioned,
cheers, ++

Bidirectional Path tracing in Mantra ? Feb. 2, 2020, 3:13 a.m.

Hello everyone,

i've been having a super cool time watching Tu Wien rendering lectures on youtube,
https://www.youtube.com/watch?v=RuBjYa4Q3dA [www.youtube.com]
i've been impressed by the bidirectional path tracing computation
because i'm facing this scene lightning scenario a lot, and i'm wondering :

Is bidirectional pathtracing available in Mantra ?

If we create an indirect light will it converge like bidirectional ?
i'm not into render engines but there are caustics and photons involved with this node
https://www.sidefx.com/docs/houdini/nodes/obj/indirectlight.html [www.sidefx.com]

… and will i got into the SDS conflict case scenario or does the PBR mantra rop protects from it ?


Thank you for your feedback

Converting textures to ACEScg Aug. 24, 2019, 9:21 a.m.

Hello,
thanks for this post,
i've made my testings on my side,

In the case of an 8 bit srgb image file
in the file node in cop check linearise non linear images,
this will make your 8bit a 16bit / then do a vopcop2filter
> Utility - Linear - sRGB conversion to ACES - ACEScg : just as previously mentioned.

If you don't linearise what happens is that your 8bit stays 8bit,
so for example if you try to put a gamma correct node after the conversion,
colors will be clamped and saturation will touch the sky > not be relevant anymore.
(That's what may happen if an intense light is close to this texture).

If you don't want to linearise, put your file node then a convert node
to convert 16 bit then apply the conversion to acescg as previously mentioned.
( Or make your own by down “fstopping” + up ‘fstopping" the duplicated file manually
and then do a fusion hdr in photoshop, that may help to fake the 16-32 bit look
with an 8bit file but that’s out of topic).

Hope it helps,
++