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Houdini Attribute Scrambler v3.0 HDA (Python 3 compatible)

Attribute blending similar to Photoshop layer blending modes.

Valid input attributes: point/prim float and vector (3flt, which includes color).

It helps keep node graphs cleaner and it's fun to use. (Disclaimer: 'fun' is subjective:) Reduces the need for common, repetitive tasks, like binding and exporting attributes in attribute VOPs or typing in wrangles for things like lerp or any of the operations below:

Supported operations:

  • Copy (v3)
  • Add
  • Subtract
  • Multiply
  • Divide
  • Minimum
  • Maximum
  • Average
  • Screen
  • Overlay
  • Exclusion
  • Linear Interpolation
  • Pin Light
  • Difference

A demo of v2 which lacks a few options and features but works in much the same way otherwise:

New to v3.0:

  • Completely re-written
  • Advanced VEX (scroll to bottom for more info)
  • 'Copy' operation - just overwrite all previous operations with this attrib (useful for then/now comparisons while dialing in your final numbers)
  • Python 2 & 3 compatible
  • Vector (3flt) support (that includes color)
  • Creates the (input) attribute if it doesn't exist (and indicates that to you)
  • Not compatible with v1 and v2 (but both are included inside)

Parameter interface

Dynamic drop-down menus will list compatible attributes only.

Inside the HDA: Attribute VOP and Attribute Wrangler are essentially identical. The former contains a single snippet of code and is independent of external 'include' files. The latter is there for debugging convenience but requires an #include directive for haki.h (haki.h needs to be copied to %HOME%/houdiniX.X/vex/include)

If you want to study it on your own, you've got:

  • Declaring and using a struct in VEX via outer code or include directive
  • Looping over a multi-parm in VEX
  • Generating menu items using Python Menu Scripts with conditional formatting
  • Dynamic "Hide When" through custom functions in the HDA PythonModule (advanced)
  • Using the HDA "Descriptive Parm" with a Python script for dynamic hints

(If you take that road above, remember to "Show Invisible Parameters" first.)

I'm totally eager to hear your feedback! Cheers!

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  • You get a .hda file and I get a pack of beer!
  • Version3.0
  • LanguageVEX & Python 3


Houdini Attribute Scrambler v3.0 HDA (Python 3 compatible)

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