| Attribute | Type | @ | $ | Description | Category | Variable Type |
|---|---|---|---|---|---|---|
File Directory | $HIP | Directory where current Houdini scene file is located. | General | Environment | ||
Project Directory | $JOB | Directory where current Houdini project is located. | General | Environment | ||
Scene File Name w/out Extension | $HIPNAME | Does not include file extension, $HIPFILE does. | General | Environment | ||
Operator String | String | $OS | Refers to a node's title name. | Channel | Global | |
Time | Float | @Time | $T | Current time in seconds. | Playback | Global |
Frame | Integer | @Frame | $F | Current frame. | Playback | Global |
Simulation Timestep | Float | @SimFrame | $SF | Current simulation timestep number as applicable in dynamic simulations. $SF = $ST / $TIMESTEP | Playback | Global |
Fractional (Sub) Frames | Float | $FF | Applicable for precision, such as motion blur. | Playback | Global | |
Frames Per Second | Float | $FPS | Set in the Global Animation Options. | Playback | Global | |
pi | Constant | $PI | Math | Global | ||
e | Constant | $E | Math | Global | ||
Dead | Integer | @dead | Particles | |||
Point Number | Integer | @ptnum | Indexing | Global | ||
Number of Points | Integer | @numpt | Total number of points in current geometry. | Indexing | Global | |
Playback | Global | |||||
Current # of Copy Instance | Integer | $CY | Copy | Global | ||
Total # of Copy Instances | Integer | $NCY | Copy | Global | ||
Home Directory | $HOME | Directory where current Houdini version directory is located, in which .env file is located. | Environment | |||
Time Step | Float | @TimeInc | Equals 1/$FPS | Playback | Global | |
Simulation Timestep Size | $TIMESTEP | Playback | Global | |||
Simulation Time | Float | @SimTime | ST | Current simulation time. | Playback | Global |