[Sidefx-houdini-list] baking coverage into point particles

Mark Elendt mark at sidefx.com
Thu Dec 10 07:12:42 EST 2009

On Wednesday Dec 09 at 22:00, Michael K. O'Brien wrote:
> I have a set of semi-transparent points (disks) and a light. I'd like to
> bake the visibility of the points as seen from the light. Basically, I want
> to project a ray from each point to the light and sum up the transparency as
> I go. Is there a way to do something like that in Houdini?

Isn't this a deep shadow map?  Or do you need it geometrically?
If you have a DSM/DCM, you should be able to sample the data in a VEX

There may be other solutions (with either VEX ray-intersection (yes
there is ray intersection in SOPs) or the Ray SOP).

How many points?

Mark Elendt

More information about the Sidefx-houdini-list mailing list