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/*
The code below crashed Povray 3.7 beta 29 and wrote a dump file. I was tryig to
follow Mike William's excellent isosurface tutorial.
I clipped the formula F() directly from his page and ran it.
I suspected use of vectors in sqrt() triggered the crash so I attempted to use
function F() to declare Fr.
That gives an error vectors found, expected float.
*/
#declare R = 3;
#declare F = function(x,y,z) { F(x, sqrt((y*y+z*z)), z) } // bug here
//#declare Fr = F(x,y,z); // This line inserted after crash of following code
// brings error requires float not vector.
// When I used function F() in isosurface
// povray crashed.
//////
isosurface {
function {F(x,y,z)}
max_gradient 3.4 // increased fom 2.4 because of rectangular
//cutout in object
accuracy 0.001
contained_by{sphere{0,R}}
pigment {rgb .9}
finish {phong 0.5 phong_size 10}
}
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"FainAvis" <nomail@nomail> wrote:
> #declare F = function(x,y,z) { F(x, sqrt((y*y+z*z)), z) } // bug here
Uh-oh - I may be totally mistaken, but isn't that a recursive definition?
I'm not surprised POV-Ray throws up on this one way or the other. Maybe this is
what you actually want:
#declare F = function(x,y,z) { sqrt((y*y+z*z)) }
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From: Warp
Subject: Re: Crashed 3.7 beta 29 using isosurface and sqrt
Date: 31 Dec 2008 05:46:29
Message: <495b4d85@news.povray.org>
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clipka <nomail@nomail> wrote:
> "FainAvis" <nomail@nomail> wrote:
> > #declare F = function(x,y,z) { F(x, sqrt((y*y+z*z)), z) } // bug here
> Uh-oh - I may be totally mistaken, but isn't that a recursive definition?
> I'm not surprised POV-Ray throws up on this one way or the other.
OTOH usually POV-Ray has used the principle that a program crash must
never happen, no matter what the input SDL contains...
--
- Warp
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