Circle POP

Summary

The Circle POP creates a number of points in a circle, ellipse or arc, and optionally connects them as a line strip, a set of triangles, separate 2-point lines, or unconnected as point primitives. You can choose to not Close the circle, where the last point/section is not connected to first.

You can add texture coordinate, normal or tangent attributes to the points or to the vertices. Of note are normals, which can optionally point radially away from the center, or tangent to the circle.

Orientation can be in any of the XY, YZ or ZX planes and then further rotated and translated.m

If a POP is connected to the input, it will translate / scale the circle to the bounding box of the input. If a POP is connected to the input and if Modify Bounds is set, it will scale / translate the circle to the bounding box of the input, and you can further translate/scale/rotate the circle.

See also Rectangle POP, Sphere POP, Primitive POP, Line POP.

circlePOP_Class

Parameters - Circle Page

Connectivity connectivity - ⊞ - Determines whether and how to connect the points.

• None none -

• Point Primitives points -

• Surface surface -

• Line Strip linestrip -

• Lines lines -

Orientation orient - ⊞ - Sets the circle orientation.

• XY Plane xy -

• YZ Plane yz -

• ZX Plane zx -

Modify Bounds modifybounds - Available only when an input is connected to the POP to set bounds for the POP. When Modify Bounds is On the parameters below will further modify the shape of the POP.

Radius rad - ⊞ - Distance to the center.

• Radius radx -

• Radius rady -

Divisions divs - The number of divisions of the circle or arc.

Closed closed - The last vertex is connected to the first vertex.

Arc Angles angle - ⊞ - The start and end angles of an arc.

• Arc Angles beginangle -

• Arc Angles endangle -

Anchor U anchoru - Puts the left side, the middle or the right side at the origin 0.

Anchor V anchorv - Puts the bottom side, the middle or the top side at the origin 0.

Translate t - ⊞ - Translate the points in the three axes.

• Translate tx -

• Translate ty -

• Translate tz -

Rotate r - ⊞ - Rotate the points around the corresponding X, Y and Z axes. Angles are given in degrees.

• Rotate rx -

• Rotate ry -

• Rotate rz -

Uniform Scale scale - Specifies a uniform scale factor in all axes.

Normal normal - ⊞ - Choose whether to create a normal attribute and the attribute class of the normal attribute.

• None none -

• Point pointNormals -

Normal Direction normaldirection - ⊞ - Choose the normal direction.

• Default default -

• Radial radial -

• Tangent tangent - Enable the output of a Tangent attribute.

Tangent tangent - ⊞ -

• None none -

• Point pointNormals -

Tangent Direction tangentdirection - ⊞ - How to calculate the tangent for each point.

• Radial radial -

• Tangent Tangent -

Texture Coordinates texture - ⊞ - Sets the attribute class where the texture coordinates should be created.

• None none -

• Point pointNormals -

• Vertex vertNormals -

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 Circle 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\nwikieditor2025.30000

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.

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.