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Matte T3D

Summary

The Matte T3D blends Input 1 and Input 2 by a mask from the third input, as the Matte TOP does: where the chosen Matte Channel is 0 the output is Input 1, where it is 1 Input 2, and in between a linear mix. All three inputs are sampled at the same normalised position, so they need not share a resolution.

Parameters - Matte Page

Matte Channel Mattechannel ⊞ - The value of the third input that blends the two volumes, from 0 (Input 1) to 1 (Input 2). Menu · default Red

Parameters - Common Page

Output Resolution Outputresolution ⊞ - Where the output's width, height and depth come from. With nothing connected to the first input the operator always uses Resolution, whichever option is set. Menu · default Use Input

  • Use Input useinput - The first input's width, height and depth.
  • Custom custom - The Resolution parameter.

Resolution Resolution1 Resolution2 Resolution3 ⊞ - Width, height and depth of the output in voxels. Used when Output Resolution is Custom, or when the first input is not connected. Memory is width × height × depth × bytes per voxel of the Pixel Format: 256³ at 16-bit float RGBA is 128 MiB. Int × 3 · default 64 · min 1

Input Smoothness Inputfiltertype ⊞ - Filtering of the internal GLSL TOPs' input samplers, as TouchDesigner's Input Smoothness. Inputs are read at normalised coordinates, so this matters whenever the input and output resolutions differ or an input is transformed. Nearest Pixel returns voxels unblended; Interpolate Pixels is trilinear. Menu · default Interpolate Pixels

  • Nearest Pixel nearest
  • Interpolate Pixels linear
  • Mipmap Pixels mipmap

Passes Npasses - Runs the operation this many times, each pass taking the previous pass's result in place of the first input. Cost scales linearly with the number of passes. Int · default 1

Pixel Format Format ⊞ - Pixel format of the output. Use Input takes the first input's format. With nothing connected, Use Input resolves to 8-bit fixed (RGBA), which clamps values to 0–1 and quantises them to 1/255: set a float format for signed distances, densities above 1, velocities or anything else outside 0–1. Menu · default Use Input

Bypass Bypass - Passes the first input through unchanged and skips the operator's work. With nothing connected the output is a single black voxel. Toggle · default Off

Version Version - T3D version of this operator. Read-only information; include it when reporting a problem. Str

Operator Inputs

  • Input 0: Input 1 T3D_in1 - Shown where the matte is 0. Sets the output resolution.
  • Input 1: Input 2 T3D_in2 - Shown where the matte is 1.
  • Input 2: Matte T3D_in3 - The mask; Matte Channel picks the value used.

Operator Outputs

  • Output 0: Output T3D_output - Input 1 and Input 2 blended by the matte.

Performance

GPU time when the operator recooks: 0.016 ms at 64³, 0.024 ms at 128³, all of its passes summed (GeForce RTX 4090, TouchDesigner 2025.33230). An operator whose inputs and parameters are unchanged does not recook and costs nothing.