Houdini 16.5 Nodes VOP nodes

Constant VOP node

Outputs a constant value of any VEX data type.

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This operator outputs a constant value of any VEX data type.

Use this operator type to create a value that is not going to change between different instantiations of the VEX operator defined by the VOP network. For example, if a shading function required multiplying a value by 2, or finding the cross product of a vector and { 0, 1, 0 }, the values 2 and { 0, 1, 0 } would most easily be represented by a Constant VOP. If the value 2 or { 0, 1, 0 } might change depending on the properties of the material being shaded, a Parameter VOP should be used instead.

Unlike this operator, the Parameter VOP allows the specification of a different value for each instantiation of the OP type that uses this VOP network. For example, if you want the surface color to be accessed by a Surface shader (SHOP) using this VOP network, make the color a Parameter VOP instead of a Constant.

Outputs

Constant Value

The value specified by the parameters of this operator.

Parameters

Constant Type

Specifies the VEX data type of the value output by this operator. In some cases there is more than one way to represent a VEX data type. For example, the vector type can be represented by 3 float values, or a single color value. This parameter also specifies how the VEX value should be represented. This determines which parameter to use to define the value output from this operator.

Default Values

Represents the value of the constant in the VEX function.

Constant Name

The name of the constant defined by this operator, both in the generated VEX code and on the operator tile’s output.

Outputs

Constant Value

The value specified by the parameters of this operator.

See also

VOP nodes