math-utility

[skim0119]

TL;DR

Added 3x3 matrix operations and quaternion-director conversion utilities for VR math calculations.

What changed?

Created two new math utility modules:

matrix3.js - Provides core 3x3 matrix operations:

• identity3x3() - Creates a 3x3 identity matrix
• transpose3x3() - Transposes a 3x3 matrix
• multiply3x3() - Multiplies two 3x3 matrices

quaternions.js - Handles conversions between quaternions and director matrices:

• quaternionFromRowwiseDirector() - Converts row-wise director matrix to THREE.js quaternion
• columnwiseDirectorFromQuaternion() - Converts quaternion to column-wise director matrix using manual quaternion-to-rotation-matrix math
• rowwiseDirectorFromQuaternion() - Converts quaternion to row-wise director matrix for elastica representation

How to test?

Import the functions and verify:

• Matrix operations produce mathematically correct results
• Quaternion conversions maintain proper orientation relationships
• Director matrices are in the expected format for elastica representation
• Integration with THREE.js quaternions works correctly

Why make this change?

These utilities enable proper coordinate system conversions between VR controller orientations (quaternions) and the elastica physics simulation format (director matrices), which is essential for translating user input into physics-based rod deformations.

[skim0119]

• spectator view sharing other session objects #50
• restructure app code for modularizing and organization #49
• math-utility #48 👈 (View in Graphite)
• Add CSS styles for VR client interface: Move inline styles from index.html to a new app.css file #47
• Add VR client functionality: Implement app.js for the VR client, including WebSocket connection handling, scene setup with Three.js, and basic event listeners for VR interaction. This file lays the groundwork for character mode selection and input handl #46
• Enhance add VR README for the VR directory, detailing setup, usage, and publishing instructions #44
• meta2quest-integration

This stack of pull requests is managed by Graphite. Learn more about stacking.

[skim0119]

Merge activity

• Apr 15, 1:56 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Apr 15, 1:59 AM UTC: Graphite rebased this pull request as part of a merge.
• Apr 15, 2:00 AM UTC: @skim0119 merged this pull request with Graphite.