how do you find the list of local variables?
best Ross

Try this

http://localhost:48626/expressions/_globals [localhost]


Rob

Hi Ross,

Different sops have different local variables that you can use. If you are looking for a way to get to the different attributes that exist in geometry points, you can look into the point() expression also.

Ok… From a replicating SOP like Copy or Duplicate (are there others?) can I find out my own “index number” somehow? I want each of my 200 copies to behave a little bit differently… is there a $INDEX or something?

Thanks! == dvb

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and for the benefit of future searches and google, here's the
variable list copied out of the 9.5 built-in help, of houdini expression variables with dollar signs.

Playbar variables

$FPS Playback speed in frames per second (as set with the Playbar controls).

$FSTART Frame number of the first frame of animation (as set with the Playbar controls). $NFRAMES (the number of frames in the animation) = $FEND - $FSTART + 1. See also $RFSTART below.

$FEND Frame number of the last frame of animation (as set with the Playbar controls). See also $RFEND below.

$F The current frame, (as set with the Playbar controls). This is a very useful variable, especially for rendered picture filename numbering.

$FF Floating point frame number.

$NFRAMES Number of frames in the animation. $NFRAMES = $FEND (the last frame of animation) - $FSTART (the first frame of animation) + 1.

$RFSTART Frame number of the first frame shown in the playbar. The playbar can show a subset of the total number of frames, allowing you to focus on a particular section of a long animation. $RFSTART and $RFEND control the subset of frames shown in the playbar.

$RFEND Frame number of the last frame shown in the playbar.

$T Current time in seconds. Equals ($F-1)/$FPS

$TLENGTH Total length of animation in seconds.

$TSTART Start time of animation in seconds.

$TEND End time of animation in seconds.

Global Variables

$PI The mathematical constant pi (3.1415926…). You can use it to calculate the lengths of arcs. 2*$PI*r (radius of circle) equals the circumference. Also, pi = 180˚ expressed in radians.

$E The mathematical constant e (2.71828…).

$HIP Job directory. This defaults to the directory where you started Houdini. You can set it through the Textport.

$HIPNAME The name of the current .hip file.

$ACTIVETAKE Contains the name of the current take.
Channel Variables

$OS Operator String. Contains the current OP’s name.

$CH Current channel name.

$IV In value (value at start of segment).

$OV Out value.

$IM In slope

$OM Out slope

$IA In acceleration

$OA Out acceleration

$LT Local time - not including stretch or offset

$IT Start time of segment

$OT End time of segment

$LIT Local start time of segment

$LOT Local end time of segment

$PREV_IT Previous segment start time

$NEXT_OT Next segment end time

COP-specific variables

$CSTART Start frame of the current COP.

$CEND End frame of the current COP.

$CFRAMES Number of frames for the current COP.

$CFRAMES_IN Number of frames available from the first input COP.

$CINC Gets the global frame increment value.

$W Current image width.

$H Current image height
Output Driver Specific Variables

$N Current frame being rendered.

$NRENDER Number of frames being rendered.

$CY is what you are after.

$NCY is the total number of copies.

$CY is what you are after.
$NCY is the total number of copies.

It took me a minute… but I wrapped my head around the stamp function. Perfect!

I kinda wish there was a way to do STAMP_INTO_COPY_CONTEXT(“NNN”,$CY), to make $NNN become available to the copies. But hey fine!

Thanks keyframe.