Generic forum to discuss Octane Render, post ideas and suggest improvements.
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I don't use Vray, but Octane does not have this feature.
However, there are some things you can do.
1. Try making a plane that has a gradual slope up behind the camera. A lot of the time, this will look like an infinite plane.
2. Make a plane to rest your object on and use a diffuse material and set it to "matte" in the material settings. This will make it a shadow catcher, make sure the plane is large enough to catch the entire shadow.. Then simply photoshop in a solid color below it.