s1631001 wrote:

> > 1:  sticking his hands in a box and throwing them out
> > 2:  tipping the box over so they go everywhere
> > 3:  kicking through a big pile of them

> I thought of a way to do 1 & 3 without particle interactions (guess I'll
> have to drop 2. Ah well)
> Fill the cardboard box with a large white box, with tiny white spheres
> scattered across the top to give the impression of the box being full.
> Now Thomas pushes his hands into the box as normal (POV-Ray's lack of
> built-in collision detection comes in handy for a change), and as he
> brings them out, we attach a hemispherical particle emitter to his hand.
> The emitter sprays white spheres upwards, and we need only perform
> collision checking with Thomas' arm and the floor! (I'm going for a
> cartoony look, so Thomas' arm is composed of cylinders and spheres)
>
> Surely somebody's system can manage that? I've seen all sorts of stuff
> coming out of you, including toroidal emitters, so this shouldn't be too
> hard...

My system can handle hemispherical (or any other concievable shape) emitter,
_but_ (and it's a big but) it cannot handle a moving environment. Moving
environments are trickier to accomodate than I think you might realise. I am
sorry I can't help you.

Also, I am writing my own system mostly for the challenge. The challenge here is
to do the three requested steps with proper particle collisions. Getting it to
"look about right" without the proper collisions just isn't as satisfying :-)

MJL

--
light_source{12*(y-z)rgb 2fade_distance 9fade_power 2area_light x,z,5,5}#macro A
(H,B,R,T)prism{0,1H+4,0u*9,9v*9,0#local I=1;#while(I<H)#local V=asc(substr(B,I,1
))-33;<div(V,10)mod(V,10)>#local I=I+1;#end pigment{red 1}rotate-<90,R>translate
-T}#end A(16"/.@VZno=<PLA89/"0,5*x)A(14",6;MWmhryXN3,"60<15,0,8>)camera{location
25*(y-z)look_at 0}A(8"6hiAG=6"-60,-10*x)box{-99(x+z)*99 pigment{rgb 1}}   // MJL

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