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Krakatoa Delete Modifier

 Available in Krakatoa v1.5.1 and higher

Overview

• The Krakatoa Delete modifier is a light-weight scripted modifier which tells Krakatoa to delete any particles with a non-zero Selection channel value.

User Interface

Delete Particles Using

• This set of radio buttons controls how the Selection channel will be used to determine which particles to delete.
  • Selection Greater Than Zero - in this mode, any particle with a Selection channel value greater than 0 will be deleted. Particles with a Selection channel value of 0 or less than 0 will be preserved.
  • Soft-Selection + ID Channel - in this mode, particles with a Selection of 0 and less than 0 will be preserved, particles with a Selection of 1 and higher will be deleted and particles with a Selection between 0 and 1 will be deleted with a probability to produce a density falloff. The ID channel will be used to keep the effect consistent between frames and avoid flickering. If no ID channel is found, the Index channel will be used instead which will produce flicker-free results only if the particle order is consistent between frames.

Usage

• The Krakatoa Delete modifier can be used in conjunction with the PRT Loader and PRT Volume objects and the Krakatoa Channels Modifiers (KCM) to delete particles according to their Selection Channel values.
  • A KCM can be used to set the Selection channel procedurally using mathematical functions, other channels and texture maps.
  • A PRT Loader can provide a pre-saved selection channel
  • A PRT Volume can acquire the selection channel of the source geometry object, allowing for indirectly painting selections and thus painting particle culling

SEE ALSO

• Culling Particles Using KCM And Selection Channel
• Selection Channel Support