"Tom A." wrote:
> 
> Hi all.
> 
> Has there been any discussion about POV performance, specifically what
> to avoid to increase performance?
> 
> For example, I recently used the City macro to create a 5 X 5 street
> city.
> I then replaced one of the types of cars with a vehicle I designed.  The
> vehicle that came with the utility is made up of 4 spheres and two
> super-elipsoids, IIRC.   Mine was made up of about 25 object, the basic
> shape created by 10 or so blobs.  The speed of rending went _way_ down.
> 
> OK, I thought, maybe it's the blobs.  I replaced the smooth shaped
> airraft with an angled one for the body.  I created the hull with a set
> of intersected planes (a technique I got from the Shapes include
> Octahedron.)
> It went even slower.
> 
> I then replaced the hull with a set of boxes, angled to give
> approximately the same shape as with the planes.  Some speedup but not
> as much as I hoped, however, the number of objects in the vehicle went
> up.  I came to the conclusion that it was probably just the total number
> of objects in the picture that was effecting the processing time.
> 
> So, is there a performance guide somewhere that might give hints on how
> to speed up processing?  Has it been discussed here (or on one of the
> other POV newsgroups - a quick search didn't produce anything, but I'm
> just looking at the titles).

Try:

http://www.students.tut.fi/~warp/povVFAQ/miscVFAQ.html#renderingspeed
http://www.students.tut.fi/~warp/povVFAQ/miscVFAQ.html#csgspeed

Most of the things you mentioned are explained there.

Possibilities for increasing render speed much depend on the situation,
but it's usually worth trying to change things and see if it improves. 

You will also notice that render speed does not only depend on the objects
but also on textures, lighting and other things.

> 
> And finally, should this be in a different newsgroup?

It's all right here, for the purpose of the single groups have a look at
povray.announce.frequently-asked-questions

> 
> (I have noticed that when I try to create 3d clouds as described in some
> examples, that my pps can drop to 50-60.  At that point, unless I really
> want to see the picture, I kill it.)
> 

50-60 pps, I wish I had such fast rendering scenes... ;-) Patience is
quite mandatory for working with Povray.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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