Let’s say I wanted to have my particles cast shadows onto a matte object. Is that possible? If so, how, and if not, could it be added to the wishlist?
That is possible to do, it’s just not exposed properly in the current release.
The way it will work is Krakatoa saves out shadow attenuation images in longitude-latitude form, which you can then apply as projector maps on the lights to put the shadows on objects.
Projector maps onto standard lights?