Houdini 16.5 Nodes VOP nodes

Ramp Parameter VOP node

Represents a user-editable ramp parameter.

On this page

The Ramp Parameter node represents a ramp user interface. The input specifies an index into the ramp. The value of the ramp at that position is the node’s output.

See the page on ramp parameters for more information on working with ramps.

Parameters

Name

The name of the new parameter, both in the VEX function declaration, the definition of any OP type that uses the VOPNET, and the VOP tile’s output. If a parameter by this name already exists, this operator will reference it and will disable most of of its own fields, such as the Parameter Type and Parameter Label.

The name must not be a reserved keyword.

Prefix

The optional prefix to prepend to the parameter name. The prefix changes the final name of the new parameter, both in the VEX function declaration, the definition of any OP type that uses the VOPNET, and the VOP tile’s output.

Postfix

The optional postfix to append to the parameter name. The postfix changes the final name of the new parameter, both in the VEX function declaration, the definition of any OP type that uses the VOPNET, and the VOP tile’s output.

Label

A human-readable label for this parameter. Appears in the parent node’s parameters and the tooltip when the user hovers over the output on the VOP tile.

Ramp Type

Whether this parameter is a color ramp (vector) or spline (float).

Color Type

The color space to use. This only applies to color ramps.

Default Interpolation

The default method for interpolating between ramp keys, for example "Linear" or "Constant". The user can change the interpolation method in the ramp interface, but this sets the default.

Use This Node to Set Parameter Attributes

When several Parameter VOPs have the same Parameter Name, only one of the nodes is used to control the attributes of the parameter. Houdini decides which node to use for this by searching all the nodes according to the user defined order, then traversing inside subnets. If none of them have this parameter turned on, the first one found is used to set the parameter attributes. If one or more do have this option turned on, the first one with this option is used, even if another node (with this option turned off) is found first.

Show UI Controls By Default

Control whether to show the ramp controls by default on the owner node’s parameter interface.

Help tab

The contents of the text field appear in the help browser when the user clicks the help button for a node of this operator type in the parameter editor.

This help can be HTML, or you can use a simple but powerful wiki format to create documentation that looks like the native Houdini help. See how to write wiki-format help.

Inputs

Position

The index into the ramp. The Ramp Parameter node outputs the value of the ramp at this position.

Outputs

Parameter

The value of the ramp at the position specified by the input to this node.

See also

VOP nodes