verlet-js

A simple Verlet (pronounced 'ver-ley') physics engine written in javascript.

Particles, distance constraints, and angular constraints are all supported by verlet-js. From these primitives it is possible to construct just about anything you can imagine.

License

You may use verlet-js under the terms of the MIT License (See LICENSE).

Examples

1. Shapes (verlet-js Hello world)
2. Fractal Trees
3. Cloth
4. Spiderweb

Code Layout

1. js/verlet-js/vec2.js: 2d vector implementation
2. js/verlet-js/constraint/: constraint code
3. js/verlet-js/verlet.js: verlet-js engine
4. js/verlet-js/objects.js: shapes and objects (triangles, circles, tires..)

Build for npm

npm run build

for automated building

npm run watch-build-test

Areas where speed might be able to be increased

• Line/intersects#28 - I can compile the maxes and minimums before hand
• any file that is named cachable can make lazy and store the information after
• changing loops in verlet.js from for( in ) to while(i--)

Known Issues and the possible solutions

• Problem: Constraints are applied after other constraints get applied
• Solution: make each constraint only return a transform and apply them after all others do
• Problem: Constraints that will force the particle in the same direction get applied ontop of eachother
• Solution: Create a Governer Constraint that creates an average of all transforms done to each particle
• Problem: Area Constraints cannot detect negative area
• Solution: ??
• Problem: Particles May tunnel
• Solution: Make the Collision solver equation based
• Problem: Collisions don't account for accelleration when solving the points new position
• Solution: Make the collision solver equation based
• Problem: Collisions don't solve lateral collisions (p goes behind ab)
• Solution: look for when the lines intersect
• Problem: Collision Solving only solves found collisions in timestep
• Solution: Collision solver goes backward in time to first collision then searches
• Problem: Collisions don't account for area behind a surface area
• Solution: ??
• Problem: points never rest
• Solution: ??