Also, there is a slightly better guide if you go to the help tab on the top Bryce tool bar and then the Help Topics button. This will take you to the Bryce 6 Artist Guide.

In the Reference section scroll down to The Palettes/Advanced Display Palette/Spray Rendering.

Here you'll find an overview and two subsections on the spray modes operation.

Happy rendering!

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...