AFAIK what you’re looking for is not possible although it would be very useful. Can anyone with more knowledge correct me if I’m wrong please? You can however select the queue bucket for the selected mesh in scene composer properties section.
What happened is that we were lucky up to now. Because theorytically the second mesh is translucent, my friend had set its bucket to translucent in the SDK and it worked up to now. Recently, we added the SSAO post processor and thus it made the bug emerge. We would actually hold the geometry in the hand of a man asset we could see the transparent part overlap the hand but it didn’t appear through walls because there were no post processors.
So all we did was to set the queue bucket to transparent in the SDK. Also, it doesn’t make sens for us to set the render bucket in the SDK : it is in the material section but it can’t actually be set in the material… and it’s in the material that we set the alpha.
You cannot set the Bucket in the material since it is not a material parameter. The bucket ensures that the transparent object is drawn on top of objects behind it. In the material you set the Blend mode to indicate that your color/texture has an alpha channel.