shadowcatcher and reflections problem

[flood]

That's strange. here how it works for me.

just white background in shadowcatcher and  direct visibility  with hdri in environment for light
http://imagizer.imageshack.com/img924/309/Fn5Xw2.jpg

this is how compositing looks, i've change direct visibility to black  for proper rendering alpha channel, it need in some case.
http://imagizer.imageshack.com/img922/7787/lNftla.jpg

Open exr in photoshop and apply alpha channel to mask layer
http://imagizer.imageshack.com/img921/4623/e5tzy4.jpg

with selected mask at layer cntl+l to adjust levels for mask to show less shadows
http://imagizer.imageshack.com/img922/4787/pKooIS.jpg

for  removing this bounce you need to use rayswitch material for shadowcatcher

Could you post your scene so that I can take a look at the settings? I probably am doing something wrong.

[sprayer]

Here scene.
it's corona 2.0

[flood]

Here scene.
it's corona 2.0

Thank you very much. This is helping me a lot. I have never used hdri mappings before. So i'm trying to replicate your scene without shadowcatcher and then build up from there...
I made the same scene from scratch and added your hdri mapping to the scene. I'm getting faceting results on the teapot and I don't know why.

I have included my scene in this post as attachment.

[romullus]

Are you using dome mapping in CoronaBitmap for your HDRI?

[sprayer]

The same for me. I have manage thats because of standard bitmap loader, if you load hdri via coronabitmap it will be fine as romullus mention,  so it's another bug i think.

[romullus]

Yes, that's a known bug. You can "fix" it by changing dome mode to spherical, or you can retain dome and instead go to dev/debug settings and change enviro sampler from default to some other (fast or precise, seems to work fine).

[flood]

Thank you all for helping me out. Faceting is gone now.

[maru]

@flood - I am referring to the 1st post and the original issue.
Do you have some reflectivity enabled for the shadowcatcher material? If no, then those "reflections" are in fact GI.
GI should be picked up by the shadowcatcher anyway, and should be visible in the alpha channel.
Basically, the image should look identical if you render the shadowcatcher in normal mode (e.g. on a blue background) and if you enable the "for compositing" mode, and then composite the image in Photoshop (e.g. with a blue background).

I am not exactly sure what is going on here, and the thread has become a bit chaotic. If you would like us to take a closer look at this, please contact us using this form https://coronarenderer.freshdesk.com/support/tickets/new

[flood]

@flood - I am referring to the 1st post and the original issue.
Do you have some reflectivity enabled for the shadowcatcher material? If no, then those "reflections" are in fact GI.
GI should be picked up by the shadowcatcher anyway, and should be visible in the alpha channel.
Basically, the image should look identical if you render the shadowcatcher in normal mode (e.g. on a blue background) and if you enable the "for compositing" mode, and then composite the image in Photoshop (e.g. with a blue background).

I am not exactly sure what is going on here, and the thread has become a bit chaotic. If you would like us to take a closer look at this, please contact us using this form https://coronarenderer.freshdesk.com/support/tickets/new

Hello Maru,

Reflectivity was not enabled for the shadowcatcher material. So yes, it's probably GI. I will create a ticket.