https://github.com/dbraun/matrixchop

Matrix Multiply CHOP
https://github.com/dbraun/matrixchop

touchdesigner touchdesigner-components touchdesigner-tool touchdesigner-tools

Last synced: 2 months ago
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Matrix Multiply CHOP

• Host: GitHub
• URL: https://github.com/dbraun/matrixchop
• Owner: DBraun
• License: mit
• Created: 2019-08-30T17:30:08.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-09-27T22:40:53.000Z (over 5 years ago)
• Last Synced: 2024-11-01T12:52:11.411Z (3 months ago)
• Topics: touchdesigner, touchdesigner-components, touchdesigner-tool, touchdesigner-tools
• Language: C++
• Size: 83 KB
• Stars: 22
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# MatrixCHOP (Matrix Multiply CHOP)

The MatrixCHOP produces the screen-space coordinates of points based on a camera and an aspect ratio. The inputs:

* Positions (XYZ): 3 channels and any number of samples

* Camera View and Projection Matrix : 16 channels and one sample. Check the demo project for an easy example.

The output:

* The UV-coordinates of the positions in the camera's view. UVs are typically between [0,0] and [1,1] if they're inside the camera's view, but the MatrixCHOP does not clamp values or delete out-of-bounds samples.

# Demo

In this image we render a white rectangle at an oblique angle. The MatrixCHOP takes the world-space positions of the rectangle's points, the camera's full view-projection-matrix, and then produces 4 new points. These 4 points are then depicted in a separate render of red squares. These squares land exactly on the corners in the first render, confirming that the MatrixCHOP outputs correct screen-space coordinates.

![](MatrixCHOP/images/demo.png)

## Instructions

[Build the dll yourself](https://docs.derivative.ca/Write_a_CPlusPlus_Plugin), or use a compiled DLL file. `MatrixCHOP/MatrixCHOP/Plugins/MatrixCHOP.dll` has been compiled as a [Custom Operator](https://docs.derivative.ca/Custom_Operators) for TouchDesigner 2019.19160.

## Changelog

* 2019-09-27 Optimization

* 2019-09-19 Public release