cocos-engine/tests/physics/volume.ts

import { director, Node, Vec3 } from "../../cocos/core";
import { physics } from "../../exports/physics-framework";

/**
 * This function is used to test the behavior of different volume ratios
 */
export default function (parent: Node, steps = 120, ratios = 0.2) {
    const nodeStatic = new Node('StaticB');
    parent.addChild(nodeStatic);
    nodeStatic.addComponent(physics.BoxCollider);
    nodeStatic.worldScale = new Vec3(20, 0.01, 20);
    nodeStatic.worldPosition = new Vec3(0, -0.005, 0);

    const high = new Node('high');
    parent.addChild(high);
    const highBody = high.addComponent(physics.RigidBody) as physics.RigidBody;
    high.addComponent(physics.BoxCollider);
    const initPos = new Vec3(0, 0.5 + ratios, 0);
    high.worldPosition = initPos;

    const low = new Node('low');
    parent.addChild(low);
    low.addComponent(physics.RigidBody);
    low.addComponent(physics.BoxCollider);
    low.worldScale = new Vec3(ratios, ratios, ratios);
    low.worldPosition = new Vec3(0, ratios / 2, 0);

    const dt = physics.PhysicsSystem.instance.fixedTimeStep;
    for (let i = 0; i < steps; i++) {
        director.tick(dt);
    }

    expect(high.worldPosition.equals(initPos, 0.01)).toBe(true);

    parent.destroyAllChildren();
    parent.removeAllChildren();
}