No consolation but I too know of this happening, I think I must have tried
every way possible I knew how to remedy it and failed. Hope a POV-Ray sage
has some wisdom to share about it.

Bob

Jeff Lee <shi### [at] gatenet> wrote in message
news:3821f2c4@news.povray.org...
> I'm not sure if this is a bug, or an undocumented feature, or if I'm
> merely doing something wrong, but when I attempt to create subprisms
> within a prism made of Bezier splines, I receive the message:
>
>    warning: Prism not closed. Ignoring it.
>
> However, each of the subprisms appears to be correct; I can comment out
> bits and render each subprism separately, and the result is what I
> expect it to look like.  But when I put them together again, they still
> fail to work.
>
> Here's a small example file, showing one linear_spline prism and one
> bezier_spline prism, each with an outer and inner subprism.  The former
> prism works exactly as the documentation says it should.  The latter
> does not.
>
> Any ideas on what I'm doing wrong, or can Bezier-spline prisms simply
> not contain subprisms?
>
> file://------------------------------ Cut
here ------------------------------
>
> #declare LinearPrism = prism { linear_spline linear_sweep 0, 5, 10,
>   <0,10>, <10,0>, <0,-10>, <-10,0>, <0,10>,  // outer prism
>   <0, 5>, < 5,0>, <0, -5>, < -5,0>, <0, 5>   // inner prism
>   pigment { colour rgb <1,1,0> }
> }
>
> #declare BezierPrism = prism { bezier_spline linear_sweep 0, 5, 32,
>   <  0, 10>, < 10, 10>, < 0, 0>, < 10,  0>,
>   < 10,  0>, < 10,-10>, < 0, 0>, <  0,-10>,
>   <  0,-10>, <-10,-10>, < 0, 0>, <-10,  0>,
>   <-10,  0>, <-10, 10>, < 0, 0>, <  0, 10>,  // outer prism
>   <  0,  5>, <  0,  0>, < 5, 5>, <  5,  0>,
>   <  5,  0>, <  0,  0>, < 5,-5>, <  0, -5>,
>   <  0, -5>, <  0,  0>, <-5,-5>, < -5,  0>,
>   < -5,  0>, <  0,  0>, <-5, 5>, <  0,  5>   // inner prism
>   pigment { colour rgb <0,1,1> }
> }
>
> object { LinearPrism translate x*-11 }
> object { BezierPrism translate x* 11 }
>
> camera { location <0,30,-30> look_at <0,2.5,0> }
> light_source { <-10000,10000,-10000> colour rgb <1,1,1> }
> plane { y, 0 pigment { colour rgb <1,1,1> }}
>
> file://------------------------------ Cut
here ------------------------------
>
>
> --
> Jeff Lee         shi### [at] gatenet         http://www.gate.net/~shipbrk/
>

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