On 2023-02-08 10:54 (-4), Chris R wrote:
> "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:
>>
>> [snip]

Confirmed on GNU/Linux.  V3.8 beta 2 yields a seg fault.  All other
versions I have beyond 3.1.0.10, including the master branch, UberPOV,
and the discontinued v3.7.1-RC1, yield "std::bad_alloc".  My oldest
UberPOV is 1.37.1.0-b10.

> One last observation, the following code also seems to work fine.  This leads me
> to believe the problem lies with returning the spline identifier from the macro
> and then trying to use it.  It's a kludgy work-around, but I can use it to
> continue on my current project.
> 
> #macro make_spline_macro()
> #declare myspline = spline {
>    natural_spline
>    0, <0, 0, 0>,
>    1, <0, 0, 1>,
>    2, <1, 0, 2>,
>    3, <2, 1, 3>
> }
> #end
> 
> make_spline_macro()
> 
> #debug concat("_pt=<", vstr(3, myspline(0), ",", 0, 3), ">\n")

This non-kludgy workaround also works:

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

#local myspline = make_spline()

#debug concat("_pt=<", vstr(3, myspline(0), ",", 0, 3), ">\n")

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