Peter Popov wrote:
[snip]
> Take a spherical density. Why test 30 samples against it if the ray
> doesn't pass through its bounding volume at all? Intersect the ray
> with the bounding object of the density, and if and only if there are
> intersections (they will be exactly two) go on with shooting the
> samples. The two intersection points will actually be samples of
> density 0 so they can be cached and used in the calculations so no
> redundant work will be done.
> 
> I think this will speed up rendering for any value of samples/pixel
> greater than 2.
> 
> Peter Popov
> pet### [at] usanet
> ICQ: 15002700

I think this would _really_ foul up some of my cloud techniques where I
use

	...
	density { spherical colour_map {[0 rgb 1][cloudBase rgb 0]} }
	...
or
	...
	density { spherical frequency -1 colour_map { ... } }
	...

and similar constructs. 

Does nobody else use blend maps in density?

Well, just my thoughts ...
	Mike Andrews.

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