

> > Shouldn't it be a circular area for realism?
> ^^^^^^
> correct ...
I don't think that's correct actually...
> either that or you can start modelling complex shapes for a
> probability model. Meaning, you support a greyscale bitmap
> where black says "no here won't get a ray shooten from" and
> white means that from here will get a ray shooten with the
> highest probability.
>
> This would allow you to form flare shapes as they sometimes
> appear in photography; think of hexagonal or triangular ones.
>
> The problem would be, that it will even slower to determine
> the point.
True, but I would be happy with the possibility to choose between a circular
area and an area in the shape of a regular polygon.
I was trying to do focalblur by averaging different renders earlier this day. I
came up with the following formula to scatter points inside a regular polygon:
#declare Seed=seed(whatever);
#declare angles=<insert number of angles here>;
#declare Rot=360*rand(Seed);
#declare X=pow(rand(Seed),.5);
#declare Rot2=Rot/(360/angles);
#declare fraqrot=Rot2int(Rot2);
#declare fraqrot2=abs(fraqrot.5);
#declare fraqrot3=pow(fraqrot2*2,.5);
#declare Location=vrotate(x*X*(.8+.2*fraqrot3),Rot*z);
This produces a random point within a regular polygon inside a circle with
radius 1 (I think, could be that it's a bit outside that circle...) (more or
less, it's not a perfect polygon, and it needs more than 3 angles to look like a
polygon)
cu!

camera{locationz*3}#macro G(b,e)b+(eb)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(yx,y,x,x+y)L(y,xy,x+y,y)L(xy,y,y,y+z)L(y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,xy,<.5,1,.5>,x) // ZK http://www.povplace.be.tf
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