Chaos Corona for Cinema 4D > [C4D] General Discussion

Multiplied alpha

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LeSill:
Hello, folks.
I'm rendering some packages, and I need to render the packages and shadows separately before composing them in Photoshop. I had an issue with the alpha on the package's edge. The anti-aliased edge does not keep the few pixels with alpha, but instead multiplies them immediately with the the white background. It causes the problem with the white edge shown in the photographs. Is there a method to store the few pixels with alpha so that I may insert any background behind the package without a white border?

BigAl3D:
The first thing I see is the package is not sitting on the plane below it. It is floating. Second, when dealing with pixels, there are some angles of edges that need more passes and anti-aliasing. First, drop that package down to actually sit on the plane and render that.

LeSill:
Hi,
The edge of the model does not rest on the ground. The bottom is slightly bulging. I want to make it as realistic as possible. I had a similar issue with Octane, which is related to PREMULTIPLIED/STRAIGHT alpha. It is clear from the attached image. The white edge should not be there. It's not only at the bottom; it's everywhere.

BigAl3D:
The only other thing that comes to mind, and it's a C4D thing, is if you're using a Sky Object and saving with alpha channel. Put a Corona Compositing Tag on the Sky and UNcheck Seen by Camera.

burnin:
tho you don't need comp. tag for that, disabling object's direct visibility is fine // uncheck "Visible Directly"

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