"SamuelT." wrote:
> 
> I remember seeing that image now. So the density_map is really a number of  images
> layered upon one another?
> 
	Let's put it this way: when you make an image you actually make a 2D
array of points and you specify a color for each point, when you make a
density_map you create a *3D* array of points and you specify a color
for each point. This allows you to determine very precisely the 3D
appearance of a pattern: let's say you wanted a conic pattern that goes
from 0 on the y axis to 1 when the distance from the y axis is greater
than y, this is impossible in standard pov. You can try making an
approximation with a gradient y and cylindrical patterns of growing
size, but a moe accurate (and probably faster) way to do it is to create
a density map which will represent what value your pattern should take
at each point in space (ok, like a pic you only define it on a ragular
array of points) and use it directly.
	You could see it as a pile of image_maps each one being only a fraction
of an unit high, was that what you meant?

		Jerome

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