BabylonJS/Babylon.js

Optimize performance for baked vertex animations

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#15,806 opened on Nov 12, 2024

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animationshelp wantedstale

Description

Optimize performances in a "Not using scale" mode (send only translation+quaternion to the shader, not a whole mat4x4).

See:

Contributor guide

Tech stack
typescriptjavascript
Domain
performance
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
WebGL/WebGPU shadersmatrix mathBabylon.js animation system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Examine the current implementation of baked vertex animations in Babylon.js, specifically how transformation matrices are passed to the shader. Look for the code that computes and uploads the matrix4x4 for each vertex animation frame. Implement an alternative path that, when scale is not used, sends only a translation vector and rotation quaternion to the shader. This change likely involves modifying both the animation processing code (e.g., in the engine or mesh classes) and the shader code to accept and decompose the transformation. Review the forum links provided for additional context.