Blobby objects

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Blobby objects

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BLOBBY OBJECTS:

BLOBBY OBJECTS SANU PHILIP

INTRODUCTION:

INTRODUCTION Some objects donot maintain a fixed shape,but change their surface characteristics in certain motions or when in proximity to other objects. Ex:Molecular structures,water droplets,muscle shapes in human body These objects can be exhibiting “Blobbiness”

BLOBBY OBJECTS:

BLOBBY OBJECTS By a blobby object we mean a nonrigid object. That is things, like cloth, rubber, Liquids, water droplets, etc. These objects tend to exhibit a degree of fluidity. For example, in a chemical compound electron density clouds tend to be distorted by the presence of other atoms/molecules.

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Examples The streching,snaping and contracting effects on molecular shapes when two molecules move apart.These characteristics cannot be adequately described simply with spherical or elliptical shapes. Muscle shapes in a human arm,which exhibit similar characteristics. We want to model surface shapes so that the total volume remains constant.

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More Blobby Objects Several models have been developed to handle these kind of objects. One technique is to use a combination of Gaussian density functions (Gaussian bumps). A surface function could then be defined by: f(x,y,z) = Σ k b k exp(-a k *r k 2 ) - T =0 where r k 2 =sqrt( x k 2 + y k 2 + z k 2)

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A three dimensional gaussian bump centered at position 0,with height ‘b’ and SD ‘a’. A composite blobby object formed with 3 gaussian bumps.

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Another technique called the meta-ball technique is to describe the object as being made of density functions much like balls. The advantage here is that the density function falls of in a finite interval.

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