The Scan CHOP converts a SOP or TOP to oscilloscope or laser friendly control waves. The output is usually in the audible range and can be heard directly via an Audio Device Out CHOP, or used to drive the X and Y deflector inputs of an oscilloscope, or a laser projector recreating the imagery. The output can also be visualized through use of a Limit SOP.
A sample component found at: Op to Audio CHOP example
A sample video can be found at: Total Internal Reflection
Parameters - Scan Page
source - ⊞ - Choose the source node family.
top- A raster image is converted to control signals by converting each pixel's location to X and Y amplitude values.
sop- A geometry is converted to control signals by converting each point's position to X and Y amplitude values.
chop- A waveform is converted to control signals by converting each graph into corresponding horizontal and vertical offsets.
rate - Samples per second, the output sample rate.
swap - Reverse the X and Y channel outputs.
xscale - Scale the x amplitude.
yscale - Scale the y amplitude.
rotate - Specified in degrees, rotates the output x,y values.
randomize - Output all samples in a random order. Creates a fuzzy chaotic image on an oscilloscope.
color - If on, r,g,b channels are created.If on, r,g,b channels are created.
redscale - Scale the output r channel.
greenscale - Scale the output g channel.
bluescale - Scale the output b channel.
blankingcount - In the case of SOP input, the number of black/off positions to insert between geometry primitives. In the case of TOP input, the number of black/off positions to insert between full raster scans. Color output must be enabled.In the case of SOP input, the number of black/off positions to insert between geometry primitives. In the case of TOP input, the number of black/off positions to insert between full raster scans. Color output must be enabled.
Parameters - TOP Page
A raster image is converted to control signals by converting each pixel's location to X and Y amplitude values. The luminance is controlled by how long each sample is "drawn" on the scope. Since the output is low bandwidth, different resampling and ordering options are available for minimizing (or enhancing) flicker.
top - Path to the TOP node.
Texture Sampling Parameters
width - The number of columns to resample the image at.
height - The number of rows to resample the image at.
level - The number of brightness levels each pixel can have.
limit - Automatically reduce the number of rows and columns dynamically to keep the output frame rate
at a constant level.
layered - Output the pixels in order of brightness, else they are output left to right for each row.
interleave - ⊞ - Controls the order in which rows are output to minimize flicker.
sweep- The rows are output in order, from top to bottom.
- Even Odd
evenodd- The rows are output in two passes, first even, then odd.
max- The rows are output in fully interleaved fashion.
Parameters - SOP Page
Every point in a SOP creates a frame-buffered, stereo audio sample, where the SOP vertex X is placed on the X channel and Y is placed on the Y channel. The oscilloscope output thus contains no aliased lines, just razor-sharp vectors.
sop - Path to the SOP node.
vertexorder - Output the points in the same order as the vertices of each polygon, instead of the order in which the points are defined in the geometry.
Limit Step Size
limitstep - Breakup long x,y jumps into several smaller incremental jumps.
stepsize - The distance each x,y can change when above option enabled.
vertexrepeat - Repeat each vertex of the each primitive multiple times.
camera - Project the geometry onto a 2D plane from this camera, otherwise, only the original x,y components of the geometry are used.
Parameters - CHOP Page
A waveform is converted to control signals by converting each graph into corresponding horizontal and vertical offsets, reproducing the original CHOP waveform. The CHOP should not be Time Sliced, but instead have some length (example a Trail CHOP or animated Wave CHOP).
chop - Path to the CHOP node.
trigger - The output graph will begin where its value exceeds this value. This allows for steady 'frozen' waveforms, analagous to an oscilloscope triggered sweep.
trimunits - ⊞ -
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).
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Any of the procedural data operators. OPs do all the work in TouchDesigner. They "cook" and output data to other OPs, which ultimately result in new images, data and audio being generated. See Node.
An Operator Family that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.
An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.
samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.
A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.
A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.
Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.
Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.