Trig POP

Summary

The Trig POP is a simple operator that converts attributes that are angles into the trigonometry representation of angles (sine, cosine, tangent). Alternately, the Trig POP can convert from the sine, cosine, tangent representation back to angles using the asin, acos and atan functions. asin(x) can be thought of as "the angle whose sine value is x".

You can choose the units your angles are expressed in - degrees (360 per rotation), radians (2 * 3.14157 per rotation) or simply rotations (1 means 1 rotation)

For example if an attribute has a value of 30 (degrees) and the Operation is set to sin(A), the Trig POP will output .5 to a new attribute.

sinh, cosh and tanh are the hyperbolic functions.

This POP does the same thing as the sin, cos... , asin, acos ... functions in the Math Mix POP, Math Combine POP, Math POP. where you can also choose the units of your angles.

sin and cos are true "functions" because for every value of angle A, there is one and only one value for sin(A). However asin(A) etc are not functions as values of A may have an infinite number or zero numbers of values for asin(A)).

The function atan2(A,B) requires that you provide two attribute values.

Note: the other trig functions not included are cot(x) is equal to 1/tan(x). sec(x) = 1/cos(x), and csc(x) = 1/sin(x).

See also Math Mix POP, LFO CHOP

trigPOP_Class

Parameters - Trigonometry Page

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

• Point point -

• Vertex vertex -

• Primitive primitive -

Group group - If there are input groups, specifying a group name in this field will cause this POP to act only upon the group specified.

Input Attribute Scope A inputattrscopea - Input attribute or attribute components for functions argument A.

Input Attribute Scope B inputattrscopeb - Input attribute or attribute components for functions argument B.

Operation operation - ⊞ - Selects the operation to perform.

• None none -

• cos(A) cos -

• sin(A) sin -

• tan(A) tan -

• acos(A) acos -

• asin(A) asin -

• atan(A) atan -

• atan2(A,B) atan2 -

• cosh(A) cosh -

• sinh(A) sinh -

• tanh(A) tanh -

• None none -

• cos(A) cos -

• sin(A) sin -

• tan(A) tan -

• acos(A) acos -

• asin(A) asin -

• atan(A) atan -

• atan2(A,B) atan2 -

• cosh(A) cosh -

• sinh(A) sinh -

• tanh(A) tanh -

From Angle Units fromunit - ⊞ - Controls the angle unit when the selected operation takes an angle as argument.

• Degrees deg -

• Radians rad -

• Cycles cycle -

To Angle Units tounit - ⊞ - Determines the angles units after the operation.

• Degrees deg -

• Radians rad -

• Cycles cycle -

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 Trig 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.

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 Group in POPs and SOPs is a named subset of points or primitives. It is created with the Group POP or Group SOP. Numerous operations in POPs and SOPs (using a Group parameter) can be restricted to affect the points or primitives in selected groups, and not affect others.

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.