On Wednesday, August 1, 2012 1:47:15 AM UTC+2, robin wrote:
>
>
> p=sum([point3d(i[:3],size=10*i[3]^(1/2)) for i in a if i[3]>.1])
>

you can try to use Tachyon. 

 
a = random_matrix(RDF, 4,4)                                     
p=sum([point3d(i[:3],size=10*i[3]^(1/2)) for i in a if i[3]>.1])
show(p, viewer="tachyon")

read the reference manual for more about this. bascially, it replaces the 
backend which is used to show the 3d objects.

h

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