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controlling object visibility with falloff sphere
I have what maybe a newbie question for C4D.
I have a complex piece of geometry and I want to control which parts of it are visible with sphere shape (not sure what else to call it) with fall off. So whenever the geometry and the sphere shape intersect, only the part of the geometry within the sphere is visible when rendered.
Any help will be appreciated. Thanks.
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3 Replies
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it’s an old channel shader and will look odd in the viewport but look up the Proximal channel. There are number of tutorials out there – you want to use it in the alpha channel of the textures of your complex piece of geometry.
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Proximal works but I find it so fiddly to deal with. My preference would be to do this using Yader’s brilliant vertex map falloff trick. Basically he uses a pose morph to morph between a zero % vmap and a 100% vmap and then applies a morph deformer to provide the falloff.
Then it’s just a question of putting the Effects>Vertex Map shader in the alpha channel.
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nice, I saw the earlier version with xpresso but missed this. Doesn’t allow alpha in the middle of a poly though only a gradient across a full poly so if the object has large polys anywhere the alpha is limited to poly size.
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