On 3/15/25 04:00, Paul Bourke wrote:
> Any ideas why this scene
>     https://paulbourke.net/transient/povray/
> crashes once "theradius" gets past a certain value, eg: 0.6. There are no
> coincident points, running version 3.7 on MacOS. Tonnes of RAM (192GB) and only
> a fraction is used.
> And more importantly, how to fix or get around it?
> 
> 

Does it crash during parsing? Rendering the first frame? Or sometime 
during the animation of the frames?

Running my playpen fork (v3.8 based Linux) for which I had a debug 
compile handy. I had no trouble with theradius at 0.65 or 0.85 - the 
render does get slow as that radius increases. Tried all the things I 
list below, but I saw no crash. I rendered at 900 x 144 on my little i3 
- without AA - and it was still 8 to 13 minutes a frame (some of that 
the extra debugging checks).

Only ideas I had on reading through your scene initially were:

1) Normalize the disc normal vector: vnormalize(VP-theposition). 
Shouldn't matter, but...

2) The disc is a funny 2d object in that it has a defined inside. So 
adding hollow a good idea, if perhaps during your animation, the camera 
happens to end up inside one or more disc shapes.

3) Fix the warnings yesbird mentioned (pushing 498,000+ discs & so 
warnings) :

    finish { emission 1 ambient 0 diffuse 0 specular 0 }

There have been problems in the past when generating huge amounts a text 
output to one or more of the output streams. All my renders had this change.

Otherwise I don't know what it might be.

---

I assume this a real market somewhere. How did you get these samples?

Bill P.

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