Houdini 20.5 Nodes Geometry nodes

MDD geometry node

Animates points using an MDD file.

On this page

This operator allows you to read in an MDD file previously created using the MDD Point Cache ROP, or another package, and animate the input geometry based on the point locations specified in the MDD file.

If there is no input geometry, then points with no connectivity will be created to represent the MDD file.

Warning

Point numbers in the input geometry must match point numbers in the MDD file.

Parameters

MDD File

The name of the file to be read.

Frame

The frame to read from the MDD file. This defaults to $FF.

Tip

To offset the animation to start at a different frame, use the expression $FF+1-start frame instead. Note that when exporting such an imported sequence, you should set the starting frame value to be start frame as well in the MDD Point Cache render node.

Reload MDD

Force a reloading of the file.

Interpolation

Type of interpolation to be used for inter-frame evaluation of the MDD file.

Coordinate System

The coordinate system used in the MDD file. If this is set to Right-Handed, z coordinates will be negated upon loading to match Houdini’s native left-handed coordinate system.

Shift to Frame 1

The frame read from the MDD file will be offset such that it will begin at frame 1.

Locals

MDD_FSTART, MDD_FEND, MDD_NFRAMES

The frame range of the loaded MDD file.

MDD_TSTART, MDD_TEND, MDD_TFRAMES

The frame range of the loaded MDD file expressed as times using the scene’s current $FPS.

Examples

SimpleMDD

This example demonstrates how to use the MDD SOP and MDD File Writer ROP.

See also

Geometry nodes