bitmap with color correction often gets yellow in IPR

[Stefan-L]

when we have a bitmap in a color correction shader, in like the base color channel often when i set the texture multiplier, the IPR render turns into plain yellow. i can only refresh it to get ok again in changing a value inside the color correction.

it seems it looses somehow the connection to the color correction shader when the texture multiplier slider is used
(which we need all the time, we often set values less than 100% to mix a bitmap over a color, which is a great feature)

hope this can be fixed for v13 release, the problem was also in v12, maybe even 11 by the way

[burnin]

disregard

on 2nd thought, since I can't reproduce this,
does it also happen, if you disable tonne mapping altogether (in Camera & Render settings)?

[Stefan-L]

hi

it is not tone mapping related,
 i mean the color correction shader inside a corona material!

so it is material related.
not the full image gets yellowish but just the material that has the bitmap with colorcorrection and a mix value that isnt 100%, like in diffuse slot, gets plain yellow in IPR render.

i can reproduce it here:
1) add a bitmap in a material in diffuse channel,
2) add a color correciotn shader to it.
3) set the mix vlue of the texture slot to liek muötity and set it maybe to 90% (to mix over the base color)

render in IPR it  renders ok

4) change soemthign to the material, liek the color correciton setting or the mix value etc,
5>> the IPR renders all objects that have this material applied as it woudl be a yellow color used instead of the shader.

you can "repair" this in going inside the color corr3eciotn shader and change one value, then the IR refreshes and render sthe material correct again

it might not happen in small scenes but in real world archviz scenes i have this very often, many times a day. as it renders ok in final image it is no drama, but from workflow i have to need to change the color correction again and agian to be able to use the ipr. or restart the ipr fully also solves it.

[John_Do]

It happens with Corona Curvature too sometimes

[John_Do]

And now it's purple with an AO, weirf. Next I'm hoping for a beautiful rainbow 💩

[Cinemike]

I remember bugs I reported in 2019, 2020 and 2021 giving "yellow results" but the issues were gone. Probably not quite and or maybe they returned.
I'll check when I find the time.

https://forum.corona-renderer.com/index.php?topic=26050.msg155291#msg155291 - Probably fixed.
https://forum.corona-renderer.com/index.php?topic=29538.msg170934#msg170934 - Probably fixed.
https://forum.corona-renderer.com/index.php?topic=26052.msg162949#msg162949 - Alive and kicking.

See nan.c4d - change the offset in the Projector shader and get a nice yellow color.
No idea if or how it is related, but just in case ...