Mike Marinos wrote:
> 
> Is it possible to create two unions , each with a single blob on top of
> a cylinder, position the unions so that the blobs are in contact with
> each other and get the blobs to interact blobby like?
> 

Only components in one blob object will interact. However, the blob object can
also have cylindrical components which should work well in your case.

> 
> While I am here, I realise that POV doesn't support this, but is there
> some reason why  any object cannot ultimately be made to behave like a
> blob when it comes into near contact with another object.

I'm not sure if _any_ object can be made to interact, but I see no real reason
why not. In fact, it can already be done in MegaPOV (a custom version of POV),
which has a 'isoblob' object - a combination of isosurface and blob.
An isosurface is just that - a surface is drawn through points where an
user-defined function evaluates to a threshold value. The isoblob object takes
this function and creates from it the density function for a blob component.
Thus, if you have the function for, say, a box, you should be able to use this
box as a blob component.
For further details, you might want to download MegaPOV and see the
documentation. Windows version is available at:
http://nathan.kopp.com/patched.htm

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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