Hello everyone,
I have an existential question and I don't know why I don't seem to find a good answer.
I didn't post this in the problem forum because I don't think it's a vray bug.
Here is the issue I have :
When I render an object I can't have a perfect mask for it. The only accurate mask method I found is to render the object and save the image as RGBA.
I made an image to show it all (please check it at full size)

For getting the result I saved the render in Exr.
The first cube is saved with RBGA directly in exr like that.

The other are composited in Photoshop, by experience I would have a similar result in After Effect.
So I have the RGB and the Alpha in a separate file and added the alpha as a mask for one and used the multimatte for the other.
You can see that the mask is never perfect as the first result.
I know that you can play with the mask in Photoshop and After Effect to make it work a little bit better but it's never perfect.
Another solution I hear often also is to render a bigger image the make it smaller so I won't have that extra edge.
So I have 2 questions :
Am I missing something to use the masks the right way ?
Why does the render don't produce a perfect mask that you can use directly ?
Please, get me a perfect solution
I have an existential question and I don't know why I don't seem to find a good answer.
I didn't post this in the problem forum because I don't think it's a vray bug.
Here is the issue I have :
When I render an object I can't have a perfect mask for it. The only accurate mask method I found is to render the object and save the image as RGBA.
I made an image to show it all (please check it at full size)
For getting the result I saved the render in Exr.
The first cube is saved with RBGA directly in exr like that.
The other are composited in Photoshop, by experience I would have a similar result in After Effect.
So I have the RGB and the Alpha in a separate file and added the alpha as a mask for one and used the multimatte for the other.
You can see that the mask is never perfect as the first result.
I know that you can play with the mask in Photoshop and After Effect to make it work a little bit better but it's never perfect.
Another solution I hear often also is to render a bigger image the make it smaller so I won't have that extra edge.
So I have 2 questions :
Am I missing something to use the masks the right way ?
Why does the render don't produce a perfect mask that you can use directly ?
Please, get me a perfect solution

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