Twist POP
Summary
The Twist POP performs non-linear deformations on points such as Twist, Bend, Shear, Taper, Linear Taper, and Squash & Stretch.
You set up one or two axes (X, Y or Z) and a pivot point to determine the direction and center of deformation. The amount of deformation is set by the Strength parameter, and the rolloff away from the pivot point and/or axes is affected by the Rolloff parameter.
The amount of deformation can also be increased or decreased using a Weight attribute, which multiplies the Strength per-point.
You can deform any point, vertex or primitive attribute.
Parameters - Twist Page
Attribute Class
attrclass - ⊞ - Makes the POP operate on point attributes, vertex attributes or primitive attributes where applicable.
- Point
point-
- Vertex
vertex-
- Primitive
primitive-
Input Attribute Scope
inputattrscope - Input's attributes you want to affect within the chosen attribute class, or attribute components.
Weight Attribute
weightattr - Specifies the scope of the attribute that stores weight values
Operation
op - ⊞ - Selects the operation to perform.
- Twist
twist-
- Bend
bend-
- Shear
shear-
- Taper
taper-
- Linear Taper
ltaper-
- Squash & Stretch
squash-
Primary Axis
paxis - ⊞ - Primary transform axis of the twist.
- X Axis
x-
- Y Axis
y-
- Z Axis
z-
Secondary Axis
saxis - ⊞ - Secondary transform axis.
- X Axis
x-
- Y Axis
y-
- Z Axis
z-
Pivot
p - ⊞ - The pivot point for the transform rotates and scales.
- Pivot
px-
- Pivot
py-
- Pivot
pz-
Strength
strength - Sets the transform operation strength.
Rolloff
rolloff - Rolloff factor on the twist operation.
Output Attribute Scope
outputattrscope - ⊞ - Name of attribute to output (can choose components of attribute), can choose from menu.
- P
P-
- N
N-
- Color
Color-
- Color.rgb
Color.rgb-
- Tex
Tex-
- PointScale
PointScale-
- LineWidth
LineWidth-
Override Automatic Attribute
overrideautoattr - Whether to override the kind of attribute automatically created based on the POP input and parameters. Allows to specify manually the type and number of components of the new attribute.
Attribute Type
attrtype - ⊞ - The output attribute's data type, default float.
- float
float-
- double
double-
- int
int-
- uint
uint-
- Color
color-
- Color (double)
dcolor-
- Direction
dir-
- Direction (double)
ddir-
Components
attrnumcomps - ⊞ - The number of components in the new custom attribute.
- 1
1-
- 2
2-
- 3
3-
- 4
4-
Default Value
attrdefaultval - ⊞ - Default values of the output attribute components if they cannot be computed.
- Default Value
attrdefaultval0- Default value(s) of the attribute.
- Default Value
attrdefaultval1- Default value(s) of the attribute.
- Default Value
attrdefaultval2- Default value(s) of the attribute.
- Default Value
attrdefaultval3- Default value(s) of the attribute.
Parameters - Common Page
Bypass
bypass - Pass through the first input to the output unchanged.
Free Extra GPU Memory
freeextragpumem - Free memory that has accumulated when output memory has grown and shrunk.
Delete Input Attributes
delinputattrs - Only output which attributes you specify in this POP - helps isolate attributes into a separate branch.
Operator Inputs
- Input 0: -
Info CHOP Channels
Extra Information for the Twist POP can be accessed via an Info CHOP.
Common POP Info Channels
Common Operator Info Channels
- total_cooks - Number of times the operator has cooked since the process started.
- cook_time - Duration of the last cook in milliseconds.
- cook_frame - Frame number when this operator was last cooked relative to the component timeline.
- cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
- cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
- cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
- cooked_this_frame - 1 if operator was cooked this frame.
- warnings - Number of warnings in this operator if any.
- errors - Number of errors in this operator if any.
TouchDesigner Build: