Christopher James Huff <cja### [at] earthlinknet> wrote:
> You can't bend a single patch into a shape that's useful for refraction, 
> but you can construct a shape out of patches that will render properly 
> with refraction. It won't work properly with some CSG operations, though.

  Unless you use a specialized algorithm to determine the insideness of
the patch object, such as the 'inside_vector' in meshes does... :)

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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