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Krakatoa Repopulate Particles Tag

Last edited on May 7, 2014

Introduction

The Krakatoa Repopulate Particles Tag can be used to increase the particle count of any Krakatoa particle source. It generates a cloud of new particles based on the various data channels of the source particles.

Creation

To add a Krakatoa Repopulate Particles Tag, select a Krakatoa particle source object, right-click it and select (New Tag) > Krakatoa Tags > Krakatoa Repopulate Particles.

User Interface

 

Enable Particle Repopulation checkbox

  • Checked by default.
  • When unchecked, the tag will be ignored and no repopulation will be performed at render time or in the viewports (if viewport preview is enabled)

Fill Radius spinner and slider

  • Defines the influence radius of each particle.
  • Default is 1 cm.
  • This value controls the range within which new particles will be seeded around the original particle.
  • It also defines the voxel spacing of the grid used for repopulation calculations.

Subdivision spinner and slider

  • Defines the number of voxel subdivisions.
  • Default is 0 (no subdivisions)
  • When set to higher values, will subdivide the voxel grid accordingly, producing finer distribution and more particles.
  • A value of 1 produces 2x2x2=8 subdivisions, a value of 2 produces 3x3x3=27 subdivisions and so on.
  • Normally, 5 particles are created in each subdivision, but this can be changed using the following control:

Number Of Particles Per Subdivision spinner and slider

  • Defines the number of particles in every Subdivision (voxel and its sub-voxels according to the Subdivisions value avove).
  • Default is 5.

Density Falloff Start spinner and slider

  • Defines the start of the Density Falloff relative to the radius distance from the particle.
  • Defaults to 0.
  • Tha falloff is generally linear, but when the Start is set to 0, no falloff will be calculated.
  • When the start is set to 1.0, the complete distance from the particle to the edge of the radius will contain the linear falloff.
  • When the value is set to 0.5, the inner half of the radius will be populated with constant Density, the outer half will perform the linear falloff.

Random Seed spinner

  • Defines the random seed for the distribution of the new particles.
  • Default is 42.
  • This value can be used to change the random pattern when particles are moving through the repopulation grid. In particular, you can animate (keyframe) this value over time to produce a changing random pattern to make the repopulated particles look like a noisy foam, otherwise it will appear as if the source particles are revealing a static pattern in space.

Enable in Viewport checkbox

  • Default is unchecked.
  • When checked, the viewport will preview the repopulated particles (could be very slow!)

 

See Also

Introduction > Particle Repopulation