schteppe/cannon.js
Cannon.js
cannon.js 是一个 JavaScript 3D 物理引擎，旨在计算三维空间中的刚体动力学和碰撞。它作为一个刚体动力学引擎，对质量、摩擦力和速度进行建模以确定物体运动，同时为应用物理约束和关节提供了数学框架。
该引擎支持多种碰撞体积，包括球体、盒子、凸多面体、用于地形模拟的高度场以及复杂的三角形网格。它提供了用于识别这些形状之间交集并计算物理交互接触精确区域的工具。
该系统涵盖了广泛的模拟功能，包括用于计算网格属性的几何分析、应用物理约束以创建机械装配，以及将物理模拟数据与外部 3D 网格同步以进行可视化。
Features
- 3D Physics Engines - Implements a 3D physics engine in JavaScript for calculating real-time rigid body dynamics and collisions.
- Rigid Body Physics Engines - Provides a comprehensive mathematical engine for calculating real-time collisions and physical forces for 3D spatial objects.
- Collision Detection - Identifies intersections between 3D shapes using discrete collision detection and interaction filters.
- 3D Collision Detection Frameworks - Provides a framework for calculating geometric intersections between spheres, boxes, polyhedrons, and meshes.
- Overlap Detection - Detects overlaps between physical bodies and identifies specific contact points.
- Mechanical Joint Constraints - Supports linking physical bodies with joint constraints such as hinges and distance locks to build mechanical assemblies.
- Rigid Body Solvers - Implements a rigid body solver to resolve physical interactions and maintain geometric constraints.
- Physics Simulations - Provides a mathematical framework for simulating physical collisions and constraints in 3D environments.
- Rigid Body Dynamics - Models the motion and interaction of solid 3D objects using mass, friction, and restitution.
- Separating Axis Theorem Collisions - Implements the Separating Axis Theorem to detect intersections between convex 3D shapes.
- Local-to-World Coordinate Transformations - Converts shape-relative vertices into global scene coordinates to determine accurate intersection points.
- Mesh-Based Collision Geometry - Uses indexed vertex arrays to define complex 3D geometry for precise collision detection.
- Sequential Impulse Solvers - Calculates rigid body movement using sequential impulse solvers to resolve constraints and collisions.
- Quaternion Rotations - Handles 3D orientation and angular velocity using quaternions to avoid gimbal lock.
- Fixed-Step Integrators - Uses fixed-step integration to ensure stability and determinism in the physics simulation.
- Mesh Property Calculators - Computes critical geometric data including face normals and approximate volume for triangle meshes to support physics calculations.
- Game Physics Integration - Integrates physics simulation data with 3D meshes to visualize movement and collisions in a browser.
- Physical Heightfield Simulations - Generates physical surfaces from height data to create interactive floors and landscapes.
- Mesh and BVH Queries - Provides utilities to query mesh elements by transforming local vertices into world space coordinates.
- Render Mapping - Implements capabilities to map rigid body position and orientation data to external 3D objects for visualization.
- Visual State Synchronizations - Provides a mechanism to synchronize physics simulation state with 3D meshes for real-time visual updates.
- Mass Property Calculation - Calculates mass, centroids, and rotational inertia based on the geometry of convex polyhedrons.
- Fixture Shape Definitions - Provides definitions for 3D rectangular prisms used for collision detection and mass calculations.
- Heightfield Generators - Generates 3D terrain surfaces from height data points for use as physical boundaries in simulations.
- Static Surface Definitions - Allows the definition of infinite flat surfaces to simulate floors and walls.
- Collision Hull Clipping - Trims faces and shapes against hulls and planes to determine exact areas of overlap for physics responses.
- Graphic Libraries - Physics engine for 3D web applications.
