Twist SOP

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Summary
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The Twist SOP performs non-linear deformations such as bend, linear taper, shear, squash and stretch, taper and twist. Each deformation will distort the object in one or more axes.

PythonIcon.pngtwistSOP_Class


Parameters - Page

Group group - If there are input groups, specifying a group name in this field will cause this SOP to act only upon the group specified. Accepts patterns, as described in Pattern Matching.  

Operation op - - This menu allows you to select a type of non-linear deformation. Select from the following options:

  • Twist twist - Rotates the input geometry around the Primary Axis.
  • Bend bend - Bends the input geometry about the Primary Axis while keeping points on the Secondary Axis stationary.
  • Shear shear - Shears the input geometry along the Secondary Axis while looking down the Primary Axis.
  • Taper taper - Tapers the input geometry along the Secondary Axis while looking down the Primary Axis.
  • Linear Taper ltaper - Tapers the input geometry as with the Taper option; however, only the edges remain straight through the Taper operation.
  • Squash & Stretch squash - Traditional animator's bounce tools.

Primary Axis paxis - - These menus allows you to select the primary and secondary axes for the deformation. The selected deformation will first occur in the Primary Axis and then the Secondary Axis.

  • X Axis x - This field allows you to choose the origin of the deformation.
  • Y Axis y - This field allows you to choose the origin of the deformation.
  • Z Axis z - This field allows you to choose the origin of the deformation.

Secondary Axis saxis - - These menus allows you to select the primary and secondary axes for the deformation. The selected deformation will first occur in the Primary Axis and then the Secondary Axis.

  • X Axis x - This field allows you to choose the origin of the deformation.
  • Y Axis y - This field allows you to choose the origin of the deformation.
  • Z Axis z - This field allows you to choose the origin of the deformation.

Pivot p - - This field allows you to choose the origin of the deformation.

  • X px -
  • Y py -
  • Z pz -

Strength strength - The Strength of the effect being applied. The Rolloff determines an accentuation of the effect being applied. When you are using different types of transformations this Strength / Roll will have different effects:

  • Bend - Strength and Roll are used to control the extremities of the geometry (try a value of 0.5).
  • Twist - Strength and Roll are used to affect the twist amount based on the distance.
  • Shear - Strength and Roll are used to affect the shear amount based on distance.
  • Taper - Strength and Roll are used to affect the direction of the bow (inwards vs. outwards).
  • Linear Taper - Strength and Roll have no effect for this option.
  • Squash and Stretch - Strength and Roll are used to maintain the apparent volume of the source geometry.

Typically, Rolloff should equal 1 - which spreads the effect evenly (although not being limited to) across the bounds of the geometry. Values higher than 1 iterate the effect multiple times through the same range. If Rolloff equals 0, then the effect may be localised to a small segment at the centre of the deformed geometry and Strength may not appear to work properly.

Note: To be certain to see the effects of the Twist SOP, make sure you have enough divisions along the edges. By using a centre that is different from that of the object you can improve your control of the object. Try moving the pivot point to the bottom of an object that you are squashing and stretching.  

Rolloff roll - The Strength of the effect being applied. The Rolloff determines an accentuation of the effect being applied. When you are using different types of transformations this Strength / Roll will have different effects:

  • Bend - Strength and Roll are used to control the extremities of the geometry (try a value of 0.5).
  • Twist - Strength and Roll are used to affect the twist amount based on the distance.
  • Shear - Strength and Roll are used to affect the shear amount based on distance.
  • Taper - Strength and Roll are used to affect the direction of the bow (inwards vs. outwards).
  • Linear Taper - Strength and Roll have no effect for this option.
  • Squash and Stretch - Strength and Roll are used to maintain the apparent volume of the source geometry.

Typically, Rolloff should equal 1 - which spreads the effect evenly (although not being limited to) across the bounds of the geometry. Values higher than 1 iterate the effect multiple times through the same range. If Rolloff equals 0, then the effect may be localised to a small segment at the centre of the deformed geometry and Strength may not appear to work properly.

Note: To be certain to see the effects of the Twist SOP, make sure you have enough divisions along the edges. By using a centre that is different from that of the object you can improve your control of the object. Try moving the pivot point to the bottom of an object that you are squashing and stretching.  


Operator Inputs

  • Input 0 -

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An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.