Shadow Alpha

[Ruchit]

Hello, below is test to get shadow pass but problem is object are also included in alpha of both shadow & matteShadow pass.
And what i want is, only alpha of shadow (i.e No objects & other stuff) like what we do using useBackground shader.

I also tried with VRayMtlWrapper by putting
Alpha contribution= -1, MateSurface=On, Shadow=On & Affect Alpha=On and apply to every object
then i got totally blackout.

[georgi.zhekov]

Hello,

What you can do is to add another VRay object properties node to your objects and disable their visibility. Does this work for your case?

[Ruchit]

Same problem with "vrayObjectProperties"
i tried both
1) primary visibility =Off &
2) matte Surface=On, Alpha contribution= -1, Shadow=On & Affect Alpha=On

Here is my scene File
ShadowPass

[georgi.zhekov]

The link to the project file seems to be broken - could you upload it again, please. Also what version of V-Ray are you using?

Thank you,

[Ruchit]

The link to the project file seems to be broken

Link is working fine her, just click & u will get option to download from google site

what version of V-Ray are you using?

Trial of 2.3 & 3

[Ruchit]

Here is output of useBackground shader apply to all objects & render with mental ray.

How to get same output using V-ray ??

[tashko.zashev]

Hi,

Thank you for posting examples of the result you want to get.

I made a sample scene setup, which is similar to the one you are using. The final render RGB and alpha channels look like this :

In this scene all objects are set to matte and "No GI on other mattes" is switched off.

Maya file : Example.zip

Here is my scene File
ShadowPass

Unfortunately we get this error when try to download the file: https://db.tt/utdTZDlt

[Ruchit]

Even i m also not able to download ur attach files, getting this error
"Ruchit, you do not have permission to access this page. This could be due to one of several reasons:".

[tashko.zashev]

Even i m also not able to download ur attach files, getting this error
"Ruchit, you do not have permission to access this page. This could be due to one of several reasons:".

Actually i see that you are using a trial version of our product, therefore you are not able to download attachments. Per our policy only customers have such forum rights.
I have sent you the download link as a private message here.