import { BVHVolumeConstraint } from '@three-blocks/core';
import { computeBoundsTree } from 'three-mesh-bvh';

// Triangle mesh constraint (containment)
geometry.computeBoundsTree();
const containerConstraint = new BVHVolumeConstraint({
  geometry,
  mode: 'triangles',
  stiffness: 1000,
  containment: true // Keep particles inside
});

// Point cloud constraint (collision with Gaussian Splats)
pointsGeometry.computeBoundsTree();
const splatsConstraint = new BVHVolumeConstraint({
  geometry: pointsGeometry,
  mode: 'points',
  pointRadius: 0.5, // Shell thickness around each point
  stiffness: 1000,
});

// In simulation loop
await containerConstraint.apply(renderer, positionsBuffer, velocitiesBuffer, particleCount);
await splatsConstraint.apply(renderer, positionsBuffer, velocitiesBuffer, particleCount);