In article <3a327ac1@news.povray.org>, "Greg M. Johnson" 
<"gregj;-)56590\""@aol.c;-)om> wrote:

> 1) Use of a step function in an isosurface leads to bandings on the side
> of the "steps" which appears especially unattractive in an animation.
> Increasing the max gradient helps but also increases render time with
> practically a diminishing rate of return.

Perhaps you should just use a mesh instead...you could make a huge city 
area out of randomly chosen "blocks". This would also be much faster 
rendering.


> 2) Negotiation of square cubes is inherently more difficult than say
> keeping particles apart from each other or negotiating an extremely
> smooth, rolling ground.   The problem is that I designed a "city" with a
> lot of places where particles can get trapped in a dead end.  The
> particles simply look to see if the closest surface is to its right or
> left and steers accordingly.  If you come into a situation where two
> cubes touch in a corner, it's really hard to get out of it.

Just cheat! Figure out how to detect this condition and cause the 
particles to crash into a building or fly into the air and explode. A 
puff of media and a flash would be enough...

Also, if you use a mesh, you can avoid most of these conditions by 
leaving spaces between the buildings.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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