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I am stuck with the following problem: I have an egg-shaped object and I want to
pull on it locally, deforming it. I want the deformation to affect the entire
shape. The easiest way to visualize it is to think of an egg with a plastic
shell and liquid inside. Now bring a match close to one spot on the egg,
locally softnening the plastic and allowing water to bulge out the shape.
One approach would be to do a blob. However, blobs are too local and they only
work with spheres and cylinders not splined lathe objects like my egg shape.
Is there a way to programmatically add a bump to an object in a particular
direction?
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Wasn't it sumdumguy who wrote:
>I am stuck with the following problem: I have an egg-shaped object and
>I want to
>pull on it locally, deforming it. I want the deformation to affect the entire
>shape. The easiest way to visualize it is to think of an egg with a plastic
>shell and liquid inside. Now bring a match close to one spot on the egg,
>locally softnening the plastic and allowing water to bulge out the shape.
>One approach would be to do a blob. However, blobs are too local and they only
>work with spheres and cylinders not splined lathe objects like my egg shape.
>Is there a way to programmatically add a bump to an object in a particular
>direction?
I reckon that there are two basic approaches, neither of them easy.
You could model your egg as a smooth mesh and calculate the changes to
the vertices and normals as the shape changes.
You could model your egg as an isosurface and do isosurface blobbing
http://www.econym.demon.co.uk/isotut/combine.htm#blob
Hint: if you want a real egg shape, rather than just an ellipsoid, you
can use non-linear scaling on a sphere
http://www.econym.demon.co.uk/isotut/substitute.htm
--
Mike Williams
Gentleman of Leisure
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