POV-Ray : Newsgroups : povray.beta-test : Spline causing 3.8 beta 2 to crash : Re: Spline causing 3.8 beta 2 to crash Server Time
28 May 2024 10:36:07 EDT (-0400)
  Re: Spline causing 3.8 beta 2 to crash  
From: jr
Date: 8 Feb 2023 10:15:00
Message: <web.63e3bc55dd6df1a988a828ca6cde94f1@news.povray.org>
hi,

"Chris R" <car### [at] comcastnet> wrote:
> I have been experiencing crashes running the latest beta of POV-Ray v3.8 (Win64)
> when trying to call a spline.  The narrowed it down to a few lines of code that
> causes the crash:
>
> #macro make_spline()
>     #local _s   = spline {
>         quadratic_spline
>         0, <0, 0, 0>,
>         1, <0, 0, 1>,
>         2, <1, 0, 2>,
>         3, <2, 1, 3>
>     }
>     _s
> #end
>
> #local myspline = spline { make_spline() }
>
> #debug concat("_pt=<", vstr(3, myspline(0), ",", 0, 3), ">\n")
>
> The contents of the spline don't seem to matter nor does the type of spline.
> The result is a memory access violation.

my self compiled beta.2 (Linux) too crashes, same error I think.  the
alpha.9945627 outputs the 'pt_' ok.

changing the macro to

#macro make_spline()
    spline {
        quadratic_spline
        0, <0, 0, 0>,
        1, <0, 0, 1>,
        2, <1, 0, 2>,
        3, <2, 1, 3>
    }
#end

gives me 'Parse Error: Spline must have at least one entry.', and no crash.


regards, jr.


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