Experimental:Trail POP

Summary

The Trail POP captures and retains all the points of the input for the most recent N frames or N "slices", being a time-history of the input's points. It then optionally creates primitives that connects the points in various ways.

If the number of points of the input is the same for all the slices, then it can easily skin points together using the Connectivity menu, such as maling a line strip for each point over time.

If the number of points is changing per-frame, as it would with a particle system, it can still connect time-related dots by using an Id attribute on the points, and making sure the Id of a particle stays the same through its life. You can select which attribute it co-relates to using the Match by Attribute parameter.

It ignores and does not use the connectivity (primitives) of the input.

If the number of points of the input is the same for all the slices, it adds one new Dimension whose size is the number of slices.

Trail Length can be expressed in Seconds or Frames. Seconds is preferable as it will remain the same if you move the Trail POP to another project with a different frame rate. Trail Increment lets you skip frames - capture a slice every Mth frame.

Reset clears and restarts the trail. Oldest Point First reverses the order of the slices.

The Trail POP deals with frame drops elegantly by (optionally) filling in data for missing frames and creating stand-in slices, and (optionally) tagging each slice with an Age attribute. This can give smoother frame-drop-resistant trail curves.

trailPOP_Class

Parameters - Trail Page

Active active -

Always Cook alwayscook -

Trail Length length -

Trail Length Unit lengthunit - ⊞ -

• S seconds -

• F frames -

Trail Increment inc -

Trail Increment Unit incunit - ⊞ -

• S seconds -

• F frames -

Reset reset -

Reset Pulse resetpulse -

Age Attribute ageattr - ⊞ -

• None none -

• Seconds seconds -

• Frames frames -

Oldest Point First oldestpointfirst -

Fill Missed Frames fillmissedframes -

Match by Attribute attrmatch -

Attribute Name attrname -

Attrib is UInt uintmax - ⊞ -

• 4 bits UInt (max 16) uint4 -

• 8 bits UInt (max 256) uint8 -

• 12 bits UInt (max 4096) uint12 -

• 16 bits UInt (max 65,536) uint16 -

• 20 bits UInt (max 1 M) uint20 -

• 24 bits UInt (max 16 M) uint24 -

• 28 bits UInt (max 268 M) uint28 -

• 32 bits UInt (max 4 B) uint32 -

Max Number of Line Strips maxls -

Connectivity surftype - ⊞ -

• None none -

• Point Prims points -

• Rows rows -

• Columns cols -

• Rows and Columns rowcol -

• Triangles triangles -

• Alternating Triangles alttriangles -

• Quadrilaterals quads -

Closed closed -

Parameters - Transform Page

Translate t - ⊞ -

• Translate tx -

• Translate ty -

• Translate tz -

Rotate r - ⊞ -

• Rotate rx -

• Rotate ry -

• Rotate rz -

Parameters - Common Page

Bypass bypass -

Delete Input Attributes delinputattrs -

Parameter Color Space parmcolorspace - ⊞ - Controls how all color parameters on this node are interpreted. The color values as treated as being in the selected color space, and are converted to the Working Color Space before they are used as part of the node's operation. Note that this does not change the color space of the node itself, as that is always in the Working Color Space.

• sRGB srgb - sRGB color space, with sRGB transfer function. Considered an SDR color space with respect to Reference White.

• sRGB - Linear srgblinear - sRGB color space, with linear transfer function. Considered an SDR color space with respect to Reference White.

• Rec.601 (NTSC) rec601ntsc - Rec.601 with NTSC primaries color space, with Rec.601 transfer function. Considered an SDR color space with respect to Reference White.

• Rec.709 rec709 - Rec.709 color space, with Rec.709 (same as Rec.2020) transfer function. Considered an SDR color space with respect to Reference White.

• Rec.2020 rec2020 - Rec.2020 color space, with Rec.2020 (same as Rec.709) transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 dcip3 - DCI-P3 color space, with D65 white point and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 (D60) dcip3d60 - DCI-P3 "D60 sim" color space, with D60 white point, and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• Display-P3 (D65) displayp3d65 - Display-P3 color space, with D65 white point, and sRGB gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACES2065-1 aces2065-1 - ACES 2065-1 (also known as ACES AP0) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACEScg acescg - ACEScg (also known as ACES AP1) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• Passthrough passthrough - When selected, the color values will be used as-is in the operation, without any modification or attempt to convert them into the Working Color Space.

Parameter Reference White parmreferencewhite - ⊞ - When converting a parameter color value to the Working Color Space, this controls how it should be treated with respect to Reference White. If the Working Color Space is the same Reference White, then no adjustment is done. If they are different, then the Reference White level (brightness) of this color will be adjusted to the range expected by the Working Color Space. For example if the project is set to have a SDR Reference White of 120 nits, and the HDR Reference White is 80 nits, then a color of (1, 1, 1), which is 120 nits in the SDR color space, will be converted to be (1.5, 1.5, 1.5), which is 120 nits still in the HDR Working Color Space.

• Default For Color Space default - Will use either the SDR or the HDR Reference White, based on the color space selected.

• Standard (SDR) sdr - Will treat the Parameter Color Space as SDR for it's reference white value.

• High (HDR) hdr - Will treat the Parameter Color Space as HDR for it's reference white value.

Operator Inputs

• Input 0: -

Info CHOP Channels

Extra Information for the Trail POP can be accessed via an Info CHOP.

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.

TouchDesigner Build: Latest\nwikieditorwikieditorwikieditorwikieditorwikieditorwikieditorwikieditorwikieditorwikieditor

Each SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.

To re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Panel Component, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the Dependencies - the necessary operators in all Networks, contributing to a frame's total "cook time".

To "pulse" a parameter is to send it a signal from (1) an exported CHOP channel or (2) a python command or (3) a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset parameter in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in an exported channel.

An operator whose Bypass flag is set does nothing: All data going into its first input appears at its output unaffected.

Information associated with SOP geometry. Points and primitives (polygons, NURBS, etc.) can have any number of attributes - position (P) is standard, and built-in optional attributes are normals (N), texture coordinates (uv), color (Cd), etc.

A Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.

The grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.

A Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.

A parameter reference can be setup between any two parameters by putting an expression in one parameter that refers to another parameter. This creates a Link between the two parameters such that when one changes, the other will change automatically (known in other software as a "constraint").

An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.