> modifiers

Noise Modifier

modifiers/noise-modifier·v1.5.1

IN:1 OUT:1

SUMMARY

The Noise Modifier samples a noise field at each instance, at its position or rest position, and turns it into a transform: a displacement, a rotation (Euler angles or Aim Along Motion) and an added or multiplied scale. The noise can be a vector or a scalar pushed along a direction, with curl noise for fluid-like motion and a full transform stack to place the field.

Solver Mode Simple applies the noise fresh every frame, while Advect carries each instance through the field over time (Initialize, then Start), turning it along its motion by Aim Weight. Do Falloff can drive translation, rotation and scale separately, and the raw noise can be output as a point attribute.

PARAMETERS

PAGENoise

Group	Group	If there are input groups, specifying a group name in this field will cause this POP to act only upon the group specified.
Target Feedback Loop POP	Targetpop	A reference to a POP node downstream in the network whose data is retrieved one frame later.
Do Falloff	Dofalloff	Weight the effect on each point by the Falloff Attribute.
Falloff Affects Translation	Falloffpos	Enable the falloff scaling the noise translation.
Falloff Affects Rotation	Falloffrot	When on, the falloff scales the noise rotation.
Falloff Affects Scale	Falloffscale	When on, the falloff scales the noise scale.
Falloff Attribute	Falloffattr	The point attribute, 0 to 1, that weights the effect.
Use Rest Attribute	Userestattr	Enable sampling the noise at the rest position, which keeps it stable under deformation.
[+]Noise Signature	Noisesignature	Determines the noise output: a scalar along a direction, or a vector.
Enable Direction from Attribute	Enabledirattr	For scalar noise, read the direction of each point from the Direction Attribute.
Default Direction	Defaultdir	Sets the direction used for all points by scalar noise when no attribute is used.
Direction Attribute	Directionattr	Sets the point attribute holding the direction of the scalar noise.
Curl Noise	Curlnoise	Use divergence-free curl noise for fluid-like motion.
[+]Type	Type	Determines the noise type.
Seed	Seed	Numerical value that initializes the randomization.
Period	Period	Period (scale) of the noise field.
Harmonics	Harmon	The number of higher frequency components to layer on top of the base frequency. 0 harmonics give the base shape.
Harmonic Spread	Spread	The factor by which the frequency of a harmonic increases relative to the previous harmonic.
Harmonic Gain	Gain	Amplitude of the Harmonics layered on top of the base frequency.
Amplitude	Amp	The noise values amplitude (a scale on the values output).
Exponent	Exp	Sets the exponent. The internal value is raised by the power of the exponent.
Offset	Offset	Adds an offset to the resulting value.
Positive Only	Positive	Takes the absolute value of the noise in each axis, making all negative values positive.
Output Noise Attribute	Outputnoiseattr	Enable writing the noise to a point attribute, weighted by the Falloff Attribute when Do Falloff is on.
Noise Attribute Name	Noiseattr	Name of the output noise attribute.

PAGETransform

[+]Transform Order	Xord	Sets the overall transform order for the transformations.
[+]Rotate Order	Rord	Sets the order of the rotations within the overall transform order.
[+]Translate	T	Translate the points through the noise space.
[+]Rotate	R	Rotate the points around the corresponding X, Y and Z axes. Angles are given in degrees.
[+]Scale	S	These three fields scale the Source geometry in the three axes.
[+]Pivot	P	The pivot point for the transform rotates and scales.
Translate 4D	T4d	Translates the points through the 4th noise dimension.

PAGEAffect

[+]Solver Mode	Solvermode	Simple is stateless and recomputed from the input each frame. Advect runs a feedback loop, started with Initialize then Start.
Affect Position	Affectposition	Apply the effect to the position.
Position Amount	Positionamount	Sets the strength of the position displacement.
Affect Rotation	Affectrotation	Enable rotating the points by the noise.
[+]Rotation Mode	Rotationmode	Determines the rotation. Euler uses the noise as rotation angles (1 is one full turn), Aim Along Motion faces the displacement.
Rotation Amount	Rotationamount	Scales the Euler angles, or blends toward the aim in Aim Along Motion (0 keeps the incoming rotation, 1 is fully aimed).
Aim Weight	Aimweight	Sets how fast the instances aim along their motion.
Affect Scale	Affectscale	Scale the points by the noise.
[+]Scale Mode	Scalemode	Determines whether the scale is added to or multiplies the existing scale.
Uniform Scale	Uniformscale	Enable using one scale value for all axes.
Scale Amount	Scaleamount	Sets the strength of the scale change.
Map from Low	Fromlow	Sets the low end of the input range of the remap.
Map from High	Fromhigh	Sets the high end of the input range of the remap.
Map to Low	Tolow	Sets the low end of the output range of the remap.
Map to High	Tohigh	Sets the high end of the output range of the remap.
Positive Only	Positivescale	Keep the noise scale positive by taking its absolute value, per axis.
Initialize	Initializepulse	Initializes the POP from its input and parameters.
Start	Startpulse	Start the simulation from the initialized state.
Play	Play	Pause or play the feedback loop.
Step	Steppulse	Advance the simulation by one frame while paused.

PAGECommon

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.
Render Primitives	Renderprimitives	Whether to render the full POPX geometry. When off, only point instances are drawn.
Convert to Point Primitives	Converttoptprim	Enable converting points to point primitives when Render Primitives is off.
SRT / RST	Srtrst	Sets the transform order, SRT or RST, used when the points are rendered as TouchDesigner instances.

ATTRIBUTES

IORead

popxFalloff

point float

Falloff attribute controlling where and how strongly the effect is applied (default popxFalloff; set by Falloff Attribute).

IOModified

P	point vec3	Instance position. Displaced by the noise in Simple mode and advected through the noise field over time in Advect mode.
Orient	point vec4	Instance orientation quaternion. Rotated by the noise (additive) or aimed along the direction of motion, blended by Rotation Amount / Aim Weight.
Scale	point vec3	Instance scale. Driven by the remapped noise magnitude when Affect Scale is on (Simple mode); unchanged in Advect mode.
Pivot	point vec3	Per-instance pivot, carried through and used to build the instance transform.
Transform	point mat3	Per-instance 3x3 transform, rebuilt from the noise-modified pose (local/world frame and scale mode).

IOCreated

FullTransform

point mat4

Per-instance 4x4 transform including pivot-corrected translation.

INPUTS

Input 0 POP - POPX/POP Geometry

OUTPUTS

Output 0 POP - POPX/POP Geometry