POV-Ray : Newsgroups : povray.general : What is -1.#IO : What is -1.#IO Server Time
21 Dec 2025 04:25:21 EST (-0500)
  What is -1.#IO  
From: Leroy
Date: 17 Dec 2025 11:45:00
Message: <web.6942dd29f2338458af272377f712fc00@news.povray.org>
I was playing with Splines using 'VPerp_To_Vector' & 'vaxis_rotate' to fill
arrays that made a spline. Then using a 'for' loop & the spline to place lots of
spheres.
The trouble started when <0,0,0> was used accidentally as input for the above.
'VPerp_To_Vector' returns <0,0,0>
'vaxis_rotate' returns <-1.#IO,-1.#IO,-1.#IO>
Or at less this is what POV prints out when checked.

What was strange is that there never was an error when using the spline, it just
didn't show any spheres or a few at the ends.

#if(V2=<-1.#IO,-1.#IO,-1.#IO>) #debug"hit"#end

Caused POV to Crash!

This was on version 3.7.0.msvc10.win64
And my computer: Window10
Processor Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz   3.30 GHz
Installed RAM 32.0 GB


Have Fun!


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