Op Operators

Last updated Jul 3, 2023 Edit Source

• Houdini

“ Op Operators I will Never Memorize” is a fantastic blog post by Mohamad Salame that summarizes all the obscurities and pitfalls you will face when having to deal with the op syntax.

• Selecting the current node: "."
• Relative path: ../nodename
• Absolute path: /obj/nodename

Gives access to files stored in an HDA

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`opdef:..?filename.ext`

or a .hda library

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`oplib:..?filename/ext`

DOCs

Returns the number of the highest connected input. This is not the number of connected inputs. If a node has four inputs and the fourth input is connected, opninputs will return 4. If the first and third inputs are connected, opninputs will return 3.

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`opninputs(".")`

Returns the name of the specified node

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`opname(".")`

Can be used to pipe the output of a COPs network live into a texture input

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op:`opfullpath("../cop2net1/OUT_COPS")`[$F]

Flexible ROP outputs

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$HIP/geo/`opinput(".", 0)`.bgeo.sc