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Rendering a plane object as transparent
Hi,
I’m animating these objects:
And outputting a Quicktime movie with alpha but all I want it the objects and the shadows and for the plane (floor) to have alpha/transparency but I can’t figure out how to do it.
I tried applying a compositing tag to the floor and deselecting ‘seen by camera’ but this didn’t work as it would output the shadows.
Can you help?
Thanks.
I really do love good design – https://www.splurj.com
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6 Replies
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There is a very handy little shadow catcher plugin that’s free — you can probably find it with a google search.
In this case, however, you can do it another way. Render an object buffer for everything but the floor and also render a shadow pass and a diffuse pass. Then, in post, use the buffer to knock out the floor from the diffuse pass, and multiply the shadow pass over everything.
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I’ll try and make sense of that later and let you know how I get on 🙂
Thanks.I really do love good design – https://www.splurj.com
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Does anyone have any simpler solutions? I’m a bit of a novice 🙂
I really do love good design – https://www.splurj.com
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Well, like I said, the simplest solution is the shadow catcher plugin, but what I described really isn’t that complicated. Here’s a video tutorial walkthrough: https://www.3danvil.com/tutorials/Shadowcatcher/Shadow%20Catcher.html
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Wow, that really was easier than it sounded, thanks Adam 🙂
I really do love good design – https://www.splurj.com
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Wow, it’s been a while since I first wrote this post, but I today I’m still having trouble with outputting shadows and alpha with Shadow Catcher.
What I want to achieve is:
Where everything is orange in this image I want to be Alpha. The spheres bob up and down with the plane hiding the underneath of the objects but i want the shadows on the plane.But when I apply Shadow Catcher the the alpha channel of the material applied to the plane I can see through the plane but i don’t want to:
Anyone got any ideas?
Splurj Creative Motion Graphics, Animation & Video Production in Manchester UK.
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