Twist surface node

Applies deformations such as bend, linear taper, shear, squash/stretch, taper, and twist.

All

Parameters

Inputs

Local variables

Example files

You can twist any geometry.

Using Bend

Select the points to bend.
Click the Bend tool on the Deform tab.
Choose a Primary Axis and Secondary Axis in the drop-down menus on the parameter editor.
Use the Strength and Rolloff parameters to control the amount of bending.

Using Linear Taper

Select the points to taper.
Click the Linear Taper tool on the Deform tab.
Choose a Primary Axis and Secondary Axis in the drop-down menus on the parameter editor.
Use the Strength parameter to control the amount of tapering.

Using Squash and Stretch

Select the points to squash and stretch.
Click the Squash and Stretch tool on the Deform tab.
Choose an axis as the Primary Axis in the drop-down menu on the parameter editor.
Use the Strength and Rolloff parameters to control the amount of squashing and stretching.

You can change the Operation of the deformation in the drop-down menu on the operation controls toolbar or the parameter editor, since twist, bend, taper, linear taper, and squash and stretch all put down the same node.

Using Taper

Select the points to taper.
Click the Taper tool on the Deform tab.
Choose a Primary Axis and Secondary Axis in the drop-down menus on the parameter editor.
Use the Strength and Rolloff parameters to control the amount of tapering.

Using Twist

Select the points to twist.
Click the Twist tool on the Deform tab.
Choose an axis as the Primary Axis in the drop-down menu on the parameter editor.
Use the Strength and Rolloff parameters to control the amount of twisting.

Parameters

Group

Subset of geometry to deform.

Operation

Type of deformation.

Bend	Bends the geometry.
Linear taper	Linearly scales the geometry along its length.
Shear	Moves the points on one side of the geometry up and the other side down.
Squash and Stretch	Scales up or down in one direction, while doing the opposite in the other two directions, to deform the geometry while retaining the same volume.
Taper	Scales the geometry along its length.
Twist	Twists the geometry around the axis.

Primary Axis

Deformations occur about the primary axis.

Secondary Axis

Points along the secondary axis remain unchanged.

Pivot

Local origin of deformation.

Strength

Strength of the deformation.

Rolloff

Attenuation of deformation.

Inputs

Twist Source

Can be any geometry, including NURBS and Beziers, but should have sufficient points for a better deformation. Use the Divide SOP or Refine SOP to achieve this.

Local variables

CEX, CEY, CEZ	The centroid of the input
XMIN, XMAX	The X extents of the bounding box of the input
YMIN, YMAX	The Y extents of the bounding box of the input
ZMIN, ZMAX	The Z extents of the bounding box of the input
SIZEX, SIZEY, SIZEZ	The size of the bounding box of the input

Example files

BasicTwist

$HFS/houdini/help/examples/nodes/sop/twist/BasicTwist.cmd

Load | Launch

This example shows off the flexibility of the Twist SOP. The Twist SOP has many operations such as twist, bend, shear, taper, linear taper, and squash.

Contained are examples of how each Operation affects different geometry types: Polygon, Mesh, NURBs, NURBs Perfect, Bezier, and Bezier Perfect.

Usages in other examples

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