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MOPs (Motion OPerators for Houdini) is a set of tools for SideFX Houdini that are intended to simplify and automate common motion graphics processes in Houdini.
Houdini 18.0 or higher (any license type)
MOPs Plus requires Houdini 19.5 or higher (any license type).
See the Readme for install instructions.
See Basics for an overview of what MOPs does and how it works.
- See MOPs Tutorial for an in-depth tutorial series on the MOPs system.
- For information on the new MOPsDOPs system in MOPs Plus, see MOPsDOPs Tutorial.
- The Houdini Hive Worldwide presentation has a good overview of what MOPs does, and a number of detailed use cases showcasing various parts of the MOPs system.
- For a complete introductory course on MOPs, see Houdini School's free tutorial series here:
- For tutorial videos about MOPs Plus tools, see this YouTube playlist.
The following is a list of all MOPs nodes you can use. For detailed help per-parameter, consult the internal Help page for each node. These links are just for a general usage overview.
IMPORTANT: Nodes flagged as "(Plus)" are part of MOPs Plus, the commercial add-on package to MOPs. To view the new MOPs+ DOP context nodes, see MOPsDOPs.
These are Object-level nodes that don't fit in with the rest of the SOP-focused toolset.
MOPs Camera Blender (Plus) - Blends the transforms of multiple cameras together smoothly, and optionally adds camera shake, physics, and composition guides.
MOPsCam (Plus) - A cinematic camera rig based on KineFX.
Generators create geometry, either polygons or packed primitives ("instances").
MOPs Convert - Converts geometry or standard packed primitives into MOPs-compatible packed primitives, with all the necessary point attributes.
MOPs Explode - Breaks the individual faces of a polygon into MOPs packed primitives.
MOPs Greeble (Plus) - Recursively subdivides and extrudes polygons to make rectilinear details.
MOPs Instancer - Creates and arranges copies of things.
MOPs to KineFX (Plus) - Creates a KineFX skeleton for packed primitives and binds the primitives to the skeleton.
MOPs Sequencer (Plus) - Generates attributes rhythmically using a tracker-like interface.
MOPs Subdivider - Divides and rotates polygon faces.
MOPs Sweep Spline - Turns curves (splines) into polygons, with many output options.
MOPs Trails - Generates stable polyline trails from input points or packed primitives, with lots of customization options.
MOPs Typography (Plus) - Generates letterforms or processes vector art with easy controls for bevels, chisels, alignment, kerning, and more.
MOPs Velocity Field (Plus) - Generate velocity fields based on Falloffs or any float attribute.
Falloffs create or modify the f@mops_falloff point attribute, which modulate the effects of Modifiers (and some Generators) downstream.
MOPs Audio Falloff - Uses defined frequency bands of an audio file to create falloff from sound.
MOPs Combine Falloffs - Composites the falloff attributes of two nodes together.
MOPs Falloff From Attribute - Remaps an existing attribute (such as i@id) into falloff.
MOPs Infection Falloff (Plus) - An "infection" solver that spreads a falloff attribute over neighboring points. Similar to MOPs Spread Falloff, but works on time-dependent geometry with changing point counts.
MOPs Noise Falloff - Uses various noise patterns to generate falloff.
MOPs Object Falloff - Uses a source SOP (points, geometry, or a volume) to create falloff.
MOPs Object Falloff Volume (Plus) - Like MOPs Object Falloff, but for volumes (including fog, vector, and heightfields).
MOPs Plain Falloff - Generates a single falloff amount to apply evenly.
MOPs Remap Falloff - Remaps an existing falloff value using range and ramp controls.
MOPs Rig Falloff (Plus) - Creates a falloff from start joint(s) to end joint(s) with optional ramp controls.
MOPs Shape Falloff - Uses a primitive shape to generate falloff.
MOPs Shape Falloff Volume (Plus) - Like MOPs Shape Falloff, but for volumes (including fog, vector, and heightfields).
MOPs Spline Falloff - Uses a source spline to create falloff, similar to Object Falloff.
MOPs Spread Falloff - Generates an animatable "spreading" falloff effect from source points or attributes.
MOPs Texture Falloff - Remaps a projected texture map into falloff.
MOPs Transform Falloff - A transform handle that can be used to modify the transform of most other Falloff nodes.
MOPs Trigger Falloff (Plus) - Records when an existing attribute crosses a value threshold, then generates a falloff that can fade in or out after the trigger event.
Modifiers change transformations or other properties of MOPs packed primitives.
MOPs Aim - Aims packed primitives towards goal positions.
MOPs Align - Moves the pivots of packed primitives relative to their bounding boxes.
MOPs Clip by Attribute - Smoothly clips geometry at attribute thresholds. Useful for growing or eroding effects.
MOPs Color Modifier - Applies a color ramp based on falloff.
MOPs Curl Modifier - Applies curl noise to the position and/or orientation of objects.
MOPs Curve Toys (Plus) - Applies various deformations to polyline curves.
MOPs Deintersect (Plus) - Fixes overlaps between packed primitives, while optionally constraining position or orientation (or constraining to a surface geometry or SDF).
MOPs Delay - Applies a delay (time-shift) effect to various transform or timing properties of objects.
MOPs Edit (Plus) - Operates like a standard Edit SOP, but in local space for packed primitives (or points with an orient attribute). Can also duplicate geometry interactively.
MOPs Filter (Plus) - A temporal filter on point transforms or other attributes. Smooths out jittery movement or attribute changes.
MOPs Magnetize (Plus) - Pushes or pulls objects based on influence points.
MOPs Move Along Mesh - Pushes objects along a polygon surface.
MOPs Move Along Spline - Pushes objects along one or more splines (curves).
MOPs Noise Modifier - Applies several kinds of noise to the position and/or orientation of input objects.
MOPs Orient Mesh - Generates useful orientation frames on a polygon mesh for use with MOPs Move Along Mesh.
MOPs Physics Edit (Plus) - Transform objects with a manipulator handle while colliding with other objects in real-time.
MOPs Pre/Post-Roll (Plus) - Automatically create pre-roll or post-roll animation from existing animation.
MOPs Pivot - AKA MOPs Align.
MOPs Randomize - Randomizes transforms and other properties of MOPs packed primitives.
MOPs Relax Modifier - Pushes objects apart to try to resolve overlaps.
MOPs Rig Aim (Plus) - Aim KineFX joints and their children at a target or targets.
MOPs Rig Delay (Plus) - Like MOPs Delay, but for KineFX.
MOPs Rig Noise (Plus) - Like MOPs Noise Modifier, but for KineFX.
MOPs Rig Spring (Plus) - Like MOPs Spring Modifier, but for KineFX.
MOPs Rig Transform (Plus) - Procedurally transforms KineFX joints in local or world space, modulated by a falloff.
MOPs Spring Modifier - Applies simple spring forces (Hooke's Law) to transforms of MOPs packed primitives.
MOPs Stepper (Plus) - Quantizes input transforms and attributes into discrete "steps".
MOPs Transform Modifier - Transforms MOPs packed primitives, similar to the Transform SOP.
These are miscellaneous tools, some of which are low-level nodes intended for use by TDs to create their own new MOPs operators.
MOPs Alembic Skeleton (Plus) - Creates a KineFX-compatible skeleton from an Alembic SOP.
MOPs Apply Attributes - The core API node of MOPs transformations. Applies template point attributes to packed primitives.
MOPs Attribute Mapper (Plus) - Allows you to create custom rules to quickly match simple attribute values to complex string attributes like texture paths or instance file paths.
MOPs Collision Geo (Plus) - Quickly and efficiently creates consistent collision geometry from lots of instances at once, including animated sequences.
MOPs Extract Attributes - Converts packed primitive intrinsics into template point attributes, usable by the Copy SOP.
MOPs Index From Attribute - Converts any point attribute (such as f@mops_falloff) into i@mops_index, suitable for use as the Template Points for a MOPs Instancer.
MOPs Neighbors - Computes an array attribute consisting of neighboring point numbers, and optionally connects them with polylines.
MOPs Noise Patterns - Create vector or scalar noise from a variety of noise functions.
MOPs Orient Curve - Creates an orientation frame for points along a curve, with additional twisting controls.
MOPs Preview Falloff - Previews the f@mops_falloff attribute using colored sprites.
MOPs Reorient - Allows the local rotation axes of MOPs packed primitives to be changed without unpacking or changing the visible orientation.
MOPs Rig Resample (Plus) - Seamlessly inserts new joints between existing joints and preserves incoming animation.
MOPs Set Sequence Time - Changes the frame index of Packed Disk Sequences or Packed Alembics that were generated via the MOPs Instancer.
MOPs Visualize Frame - Visualizes the "up", "normal", and "side" axes of any points with an "orient" attribute.
MOPs Waveforms (Plus) - Generates or modifies attributes based on periodic waveforms.
MOPs DOPs are DOP (dynamics) nodes that operate within simulations. These allow you to direct MOPs-like animations and still get collisions and other dynamic interactions.
MOPs Aim DOP (Plus) - Orients packed primitives or points towards goal objects, blended by a falloff attribute.
MOPs Apply Attributes DOP (Plus) - Computes forces that translate, rotate, and scale packed primitives or points to match goal transforms.
MOPs Fetch Attribute DOP (Plus) - Quickly and easily updates attributes in a simulation with values from SOPs.
MOPs Move Along Spline DOP (Plus) - Like MOPs Move Along Spline, but in a simulation so you get collisions!
MOPs Noise Modifier DOP (Plus) - Applies one of many loopable noise functions to translation, orientation, and/or scale.
MOPs Runtime RBD Constraints (Plus) - Generates new Bullet constraints upon collisions between objects. Can create all kinds of interesting compounding effects.
MOPs Roll DOP (Plus) - Computes orientation for spherical particles so that they roll or spin like wheels as they move, based on their diameters.
There are also Falloff nodes in DOPs that are otherwise functionally equivalent to their SOP counterparts, except they operate during the simulation instead of in the SOP timeline. This means you can apply Shape falloffs based on the positions of objects during the simulation, for example. These Falloffs include:
- MOPs Combine Falloffs - apply a compositing operation to combine two falloff attributes.
- MOPs Noise Falloff - create falloff based on one of several loopable noise functions.
- MOPs Object Falloff - create falloff based on the proximity to an object.
- MOPs Plain Falloff - create a simple one-value falloff on all objects.
- MOPs Shape Falloff - create falloff based on one of several simple position-based functions (linear, spherical, radial, cylindrical, etc).