SOP to CHOP
The SOP to CHOP uses a geometry object to choose a SOP from which the channels will be created. The channels are created from the point attributes of a SOP, such as the X, Y and Z of the point position.
From the SOP you can select a subset of the points using Point Groups. The set of attributes that are converted to channels are chosen using the names of the attributes seen on the Info popup of SOP tiles (middle mouse click on a SOP in a SOP network pane).
For data going the opposite direction, see the Channel SOP.
Note: This CHOP works in tandem with the Channel SOP. Point data is modified in CHOPs as regular channel data (samples) and then fed back to geometry as point attributes through the Channel SOP.
Parameters - SOP to CHOP Page
sop - Specifies which Object / SOP contains the geometry you want to fetch.
group - Only points within the specified group are Fetched. If blank, all points are fetched.
position - When On will retrieve the position attributes (P) from the SOP and create channels tx, ty, tz.
colorrgb - When On will retrieve the RGB color attributes (Cd0, Cd1, Cd2) from the SOP and create channels cr, cg, cb.
coloralpha - When On will retrieve the Alpha color attribute (Cd4) from the SOP and create channel alpha.
normal - When On will retrieve the Normal attributes (N) from the SOP and create channels nx, ny, nz.
textureuv - When On will retrieve the UV texture attributes (uv0, uv1) from the SOP and create channels u and v.
texturew - When On will retrieve the W texture attribute (uv2) from the SOP and create channel w.
pointindex - Turn On to output the point index of each point in the SOP in a channel called index.
Normal Position XYZ
normpos - Turn On
custom - Turn On to access any attributes in the SOP including Custom Attributes by using the two parameters below.
attribscope - This selects the custom attributes of the SOP to acquire.
You can use any attribute. If you look at the SOP's info by middle-mouse clicking on the SOP and there are other attributes, you can specify them. For example "pscale" will the particel scale attribute if it exists.
See Attributes for a complete list of attributes.
renamescope - This parameter matches each channel acquired in the Attribute Scope. There must be one name per attribute value. By default, it translates the P attribute (position of the point) to
tz channels. You can use Pattern Matching to specify multiple channels.
transobj - If a transform object is specified, the point values will be represented relative to that object's origin and rotation.
rate - The sample rate of the channels, in samples per second.
Parameters - Common Page
timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.
scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page.
Sample Rate Match
srselect - ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.
- Resample At First Input's Rate
first- Use rate of first input to resample others.
- Resample At Maximum Rate
max- Resample to the highest sample rate.
- Resample At Minimum Rate
min- Resample to the lowest sample rate.
- Error If Rates Differ
err- Doesn't accept conflicting sample rates.
exportmethod - ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.
- DAT Table by Index
datindex- Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
- DAT Table by Name
datname- Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
- Channel Name is Path:Parameter
autoname- The channel is the full destination of where to export to, such has
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).
Info CHOP Channels
Extra Information for the SOP to CHOP can be accessed via an Info CHOP.
Common CHOP Info Channels
- start - Start of the CHOP interval in samples.
- length - Number of samples in the CHOP.
- sample_rate - The samplerate of the channels in frames per second.
- num_channels - Number of channels in the CHOP.
- time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.
- export_sernum - A count of how often the export connections have been updated.
Common Operator Info Channels
- total_cooks - Number of times the operator has cooked since the process started.
- cook_time - Duration of the last cook in milliseconds.
- cook_frame - Frame number when this operator was last cooked relative to the component timeline.
- cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
- cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
- cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
- cooked_this_frame - 1 if operator was cooked this frame.
- warnings - Number of warnings in this operator if any.
- errors - Number of errors in this operator if any.