Switch POP

Summary

The Switch POP lets you choose one of the inputs, and outputs the input unchanged. The number of points, vertices and primitives of all of the inputs can be different.

It uses a numeric parameter, Index, to choose the input, with 0 referring to the first input. If Index is fractional - a non-integer, it can blend two inputs: If the inputs have the same number of points, vertices and primitives, they can be blended, two adjacent inputs at a time.

Tip: Since it blends only adjacent inputs (input N with input N+1 or N-1), to blend from the last input to the first input, attach the first input again as the last input, and use CHOPs to loop from 0 to number-of-inputs snap back to 0 when Index reaches number-of-inputs.

If Index is out of range, it clamps.

See the Blend POP to blend arbitrary combinations of inputs.

The Switch POP's architecture for handling multiple inputs is similar to the Attribute Combine POP.

switchPOP_Class

Parameters - Switch Page

Index index - Input index to output.

Extend extend - ⊞ - Determines what to do when the index exceeds the number of inputs. Allows for negative indices.

• Clamp clamp -

• Loop loop -

• ZigZag zigzag -

Blend between Inputs blend - Blends the input POPs attributes when using floating point numbers in the index parameter.

Length Mismatch lengthmismatchnotif - ⊞ - Length mis-match motification action.

• Length Mismatch lengthmismatchnotif -

• Length Mismatch Action lengthmismatchaction - Specify which attribute values to use when sampling outside of the input range.

Point Attribute Scope pointattrscope - ⊞ - The Point attribute scope to blend.

• * * -

Primitive Attribute Scope primattrscope - ⊞ - The Primitive attribute scope to blend.

• * * -

Vertex Attribute Scope vertattrscope - ⊞ - The Vertex attribute scope to blend.

• * * -

Input input - Start of Sequential Parameter Blocks managing the inputs of the POP.

In POP(s) input0pop - Input POPs for the current sequence block.

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 Switch 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.

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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.

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.

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 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.