I am keen on this idea and will try to implement it. There are, however, some 
objections that 
might get in the way of the implementation:

Ralf Stephan wrote:

> Second, since atoms have no individuality,
> and spheres of each element the same size and material, any sphere can  
> be a macro.

But atoms are individual, and each one of them can be made display at different 
sizes and 
colors. The Jmol exporter is reading each atom and rendering it in VRML the 
same way it is 
rendered in Jmol. Standard CPK size and color cannot be assumed to be the case 
for all 
atoms.


> There is further capacity for optimisation by discretising cylinder  
> joint lengths.
> If opaqueness is a condition, cylinders could be made in only a few  
> sizes 

Which sizes? Bonds are of many lengths.


> 'shoved' into spheres if too long.

I guess that the vrml file could be manipulated in some software. Then, what 
would happen 
if e.g. the spheres were disabled? How would the molecule look like? I think 
that currently it 
will display correctly as sticks (must test this).




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