ammo.js softbody demo on p5 editor cannon ball game Lv1 sample source linked


here is sample source https://editor.p5js.org/setapolo/sketches/e7xZ2cfjV https://preview.p5js.org/setapolo/present/e7xZ2cfjV


Visual impression: A jelly-like blob squashes on impact and quickly regains its shape, bouncing with a soft, lively feel.
Technique names: Ammo.js (Bullet Physics, wasm) btSoftBody with Three.js; mixed rigid/soft-body simulation; ray-cast projectile.
Explanation: The scene runs in a btSoftRigidDynamicsWorld with gravity, advanced each frame by stepSimulation. The soft object is built from a triangle mesh via CreateFromTriMesh and solved as a mass-spring network of nodes and links. Volume feel is sustained by set_kPR (internal pressure). Return speed and damping are tuned with set_kDP and surface friction with set_kDF. Material stiffness uses set_m_kLST / set_m_kAST. Soft–soft and soft–rigid contacts are enabled by set_collisions(0x11). For rendering, Three.js updates the mesh each frame by mapping geometry vertices to soft-body nodes (get_m_nodes) and writing back positions and normals; vertices are pre-merged with BufferGeometryUtils.mergeVertices so indexing matches. On click, a ray gives direction, a rigid ball is created (btSphereShape) and launched using setLinearVelocity. Camera and lights are standard Three.js, drawing every frame in sync with the physics step to show smooth deformation and recovery.

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