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Chroma keying issue (Floor and feet)
Well, I feel that if someone can answer this I ought to pay them a high price, but I’ll give it a try.
I have once again started using C4D for chroma keying inside a 3D environment. Now that C4d supports real time animation preview in the viewport, it’s becoming more attractive.
But looking at these screen captures, I can’t seem to remove the space between the golfer’s feet and the floor.
https://www.kaptis.com/media/web/golfer.jpg
The golfer is a chroma key material applied to a plane.
I have tried using a floor object or a plane as floor. Moving the golfer down yields to the second picture; still a space there.
https://www.kaptis.com/media/web/golfer-down.jpg
Any ideas ?
I understand that C4D wasn’t really built for this application, but getting 3D into AE is just an absolute pain and that just would save me days of work.
Vince
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2 Replies
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maybe make the bias of the shadow smaller
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This actually looks like a bias problem and luckily it is a simple solution. I teach a Maya 3D VFX training course and my students often run into this problem when they build object too small. This doesn’t have anything to do with the green screen or image plane. The problem is actually being caused by the shadow’s bias. I’m not sure how C4D works because I don’t use that app for production, but Maya has a dmap bias setting that can be decreased to eliminate the gap. Dmap bias is created to prevent objects from casting self-shadowing artifacts. When the value is too high, it looks like the objects are detached from their shadow. Decrease the bias if you have an option in C4D. If that isn’t a feature, you should be able to solve the problem by scaling your whole scene larger until the gap is not visible. Hope this helps.
Jon Elsdon
VFX Supervisor
EEFX.COM – Chroma Key Green Screens & Supplies
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