Strand Filter Modifier 

The Strand Filter modifier is designed to remove a subset of input hairs based on user-defined predicates. This is useful when you want to limit the display of a dense hair object to just a few strands while, at the same time, being able to see the overall shape. Filter can be used together with Edit Guides operator to edit a simplified version of a groom with more interactivity due to working with fewer strands.

 

Parameters 

• Predicate
  Determines how the strands are filtered out
  • Random
    Strands are removed randomly, based on fraction specified
  • Even
    Strands are removed in a way that their root distribution is kept uniform. This can avoid uneven holes appearing when using Random distribution, but this option is slower than Random.
  • By Group
    Strands belonging to the specified strand group(s) are removed
  • By Index
    Strands which have specified indices are removed
• Fraction
  When using random predicate specifies what fraction of hair will be filtered out
  • Map
    Allows to vary the fraction values over the surface with a texture map
  • Channel
    Allows to vary the fraction values per each strand based on a strand channel
• Filtered Pattern
  Pattern which specifies which strand groups or indices, depending on predicate type, will be filtered out
• Random Seed
  When using Random option provides the random seed

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