Bob Hughes wrote:
> 
> Have you tried using 'inverse' with a 'difference' of the canoe mesh
> and plane?
> Meshes (bicubic, triangles, etc.) don't CSG well, if at all.
> Other messy option would be to reproduce the basic canoe shape using
> somethings else, like a set of blob components, and difference that
> from the plane.
> 
> Bob

 This may sound like a strange suggestion but that is what I am good at :)

 Triangle and bicubic patches as my learned colleague Bob has pointed out
do not work well ( or at all in most cases) in CSG operations. The only
real exception to this are height fields. With a little effort I propose
that it might be possible to give your existing canoe a greyscale gradient
pigment, render it, then use the image produced as a height field. You
could then use this height field in a CSG operation to hollow out the plane
that is your water. A bit cumbersome but certainly not outside the realms
of possibility.

-- 
Ken Tyler

See my 1000+ Povray and 3D Rendering and Raytracing Links at:
http://home.pacbell.net/tylereng/index.html

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