Accumulate POP

Summary

The Accumulate POP takes an attribute from the input, and creates a new attribute whose values in each point are the sum of the values in the input attribute of the previous points.

For example, if an input has 100 points, and an attribute called Steps contains the same number, say 3 for each point, then the output attribute Scan will contain 3, 6, and 9 for the first three points, and 300 for the last point. It is the running sum or "integral".

If you change Type to Exclusive Scan, it will not count the current point's value, so the Scan attribute will contain 0, 3, 6 up to 297 in the last point.

The Accumulate POP can work on a point, vertex or primitive attribute. If the input is a float3, the new attribute will be float3, etc.

You can check it all with a POP to DAT.

See also: Analyze POP, Histogram POP

accumulatePOP_Class

Parameters - Accumulate Page

Attribute Class attrclass - ⊞ - Makes the POP operate on point attributes, vertex attributes or primitive attributes where applicable.

• Point point -

• Vertex vertex -

• Primitive primitive -

Input Attribute Scope inputattrscope - Input's attributes you want to affect within the chosen attribute class, or attribute components.

Type scantype - ⊞ - The accumulated value for each point includes the current point's value, or does not include the current point's value.

• Inclusive Scan inclusive -

• Exclusive Scan exclusive -

Output Attribute Scope outputattrscope - ⊞ - Name of attribute to output (can choose components of attribute), can choose from menu.

• P P -

• N N -

• Color Color -

• Color.rgb Color.rgb -

• Tex Tex -

• PointScale PointScale -

• LineWidth LineWidth -

Override Automatic Attribute overrideautoattr - Whether to override the kind of attribute automatically created based on the POP input and parameters. Allows to specify manually the type and number of components of the new attribute.

Attribute Type attrtype - ⊞ - The output attribute's data type, default float.

• float float -

• double double -

• int int -

• uint uint -

• Color color -

• Color (double) dcolor -

• Direction dir -

• Direction (double) ddir -

Components attrnumcomps - ⊞ - The number of components in the new custom attribute.

• 1 1 -

• 2 2 -

• 3 3 -

• 4 4 -

Default Value attrdefaultval - ⊞ - Default values of the output attribute components if they cannot be computed.

• Default Value attrdefaultval0 - Default value(s) of the attribute.

• Default Value attrdefaultval1 - Default value(s) of the attribute.

• Default Value attrdefaultval2 - Default value(s) of the attribute.

• Default Value attrdefaultval3 - Default value(s) of the attribute.

Parameters - Common Page

Bypass bypass - Pass through the first input to the output unchanged.

Free Extra GPU Memory freeextragpumem - Free memory that has accumulated when output memory has grown and shrunk.

Delete Input Attributes delinputattrs - Only output which attributes you specify in this POP - helps isolate attributes into a separate branch.

Operator Inputs

• Input 0: -

Info CHOP Channels

Extra Information for the Accumulate 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\nwikieditorwikieditor2025.30000

POPs (Point Operators) is a new Operator Family of TouchDesigner that runs on the GPU accelerated graphics card or chips, and creates/modifies 3D data which is rendered by the Render TOP or passed to devices like DMX lighting, LED arrays, lasers or other external systems.

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.

A sequence of vertices form a Polygon in a SOP. Each vertex is an integer index into the Point List, and each Point holds an XYZ position and attributes like Normals and Texture Coordinates.

A surface type in SOPs that includes polygon, curve (NURBS and Bezier), patch (NURBS and Bezier) and other basic shapes like sphere, tube and metaball. Points and Primitives are part of the Geometry Detail, which is a part of a SOP.

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. TOPs have Channel Mask, a similar feature.

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

The Graphics Processing Unit. This is the high-speed, many-core processor of the graphics card/chip that takes geometry, images and data from the CPU and creates images and processed data.

Attributes are data associated with POP geometry. Points, Vertex (Vertices) and Primitives (polygons, lines, etc) can have any number of attributes.

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.