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Movie with shadow
Hi,
I guess that this has been asked a million times before, but I’m really stuck here.
I have a simple animation of a cube, a light and a shadow on the floor.
Now I want to render out the movie to use it in After Effects. I tried several things with After Effects Export and Multipass Rendering but somehow nothing really works out. What is the easiest way to achieve a rendered movie with transparent background BUT including the shadows on the floor (without showing the floor)?
Sorry again! 🙂
All the best
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5 Replies
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the link didnt work for me.
So i have copied and pasted from the maxon FAQ: lighting sectionProblem
How do you cast a shadow on an plane with only the shadow being visible, not the plane?
Detailed DescriptionHow do you set up a scene so that you can render out a shadow of an object and composite a background image for the shadow to be cast on?
SolutionThis is easily accomplished using the Compositing tag (R6/7: Render Tag). Add this tag to any shadow casting object(s) and disable the Seen by Camera option, while making sure Seen by Rays and Cast Shadows options are enabled.
Add a compositing tag to the object containing the background image (a plane works best – background objects won’t work) and activate the Receive Shadows and Compositing Background options.
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Hi Brian and Randy,
I’m aware of the compositing tag but it doesn’t seem to help me for what I’m trying to achieve.
When I’m using the compositing tag, my render-file will have no floor. That’s correct – but there is also no shadow rendered.
I tried using multipass-rendering and rendered the shadow only. That works, but then I have no transparency in the resulting pass-file.
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Shadow passes dont have alpha they end up bright white..and the shadow. You need to multipy over your other layers.
Also you use a compositing tag on both the object and the floor.
/randy
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Randy,
thank you so much! The multiply-tip was just what I needed.
Thanks again…
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