因此，我花了很长时间尝试从头开始为自己的游戏引擎开发碰撞检测系统，但由于时间不足而无果而终。最后我决定尝试使用 Jbullet 来让事情变得更快。现在文档基本上没用了，我在尝试将项目符号代码传输到 java 时遇到了一些困难（或者我传输的内容不起作用）。我一直在扯头发试图搜索库代码，但是我希望节省的时间几乎没有用。所以，我将解释我在做什么，也许你们可以帮助我。我只是在寻找简单的碰撞检测，就像你撞到东西然后现在只打印一行。其余的我可能可以自己解决。
所以我创造了我的世界：
BroadphaseInterface broadphase = new DbvtBroadphase();
CollisionConfiguration collisionConfig = new DefaultCollisionConfiguration();
Dispatcher dispatcher = new CollisionDispatcher(collisionConfig);
ConstraintSolver solver = new SequentialImpulseConstraintSolver();
DynamicsWorld dynamicsWorld = new DiscreteDynamicsWorld(dispatcher, broadphase, solver, collisionConfig);
return dynamicsWorld;
所以我有我的实体类，在那里我有另一个类，用于存储附加到该实体的物理对象的所有信息。这让我可以简单地做： entity.getPhysics().getCollisionObject()/.setPosition() 等等...
然后我在该类中创建我的 CollisionObject：
List<org.lwjgl.util.vector.Vector3f> mesh = model.getModel().getVertices();
ObjectArrayList<javax.vecmath.Vector3f> vertices = new ObjectArrayList<javax.vecmath.Vector3f>();
for(org.lwjgl.util.vector.Vector3f vertex:mesh){
javax.vecmath.Vector3f v = new javax.vecmath.Vector3f(vertex.x, vertex.y, vertex.z);
vertices.add(v);
}
ConvexHullShape shape = new ConvexHullShape(vertices);
ShapeHull hull = new ShapeHull(shape);
hull.buildHull(shape.getMargin());
ConvexHullShape newShape = new ConvexHullShape(hull.getVertexPointer());
CollisionObject result = newShape;
我相信这会从 LWJGL 库的 Vector3f 和 Jbullets Vector3f 转换已经制作的网格，我用它来渲染我的实体。然后它从网格中的这些顶点创建一个 ConvexHullShape，我相信：
hull.buildHull(shape.getMargin());
应该是为了简化网格（来自文档）。然后我只创建碰撞对象。很简单，我觉得...
我创建了我的刚体（虽然我不确定我需要一个刚体还是只是一个碰撞对象，如果有人能让我知道这是不是真的，那就太好了）：
//mass = 0, so that there is not any gravity application?
float mass = 0;
Transform transform = new Transform(new Matrix4f(new Quat4f(rotation.x, rotation.y, rotation.z, 1), position, scale));
this.transform = transform;
MotionState state = new DefaultMotionState(transform);
RigidBodyConstructionInfo info = new RigidBodyConstructionInfo(mass, state, shape);
RigidBody body = new RigidBody(info);
然后我通过我的游戏循环：
dynamicsWorld.stepSimulation(DisplayManager.getFrameTimeSeconds(), 7);
dynamicsWorld.performDiscreteCollisionDetection();
dynamicsWorld.setInternalTickCallback(new InternalTickCallback(){
@Override
public void internalTick(DynamicsWorld world, float delta) {
Dispatcher dispatcher = world.getDispatcher();
int manifoldCount = dispatcher.getNumManifolds();
for(int i = 0; i < manifoldCount; i ++){
PersistentManifold manifold = dispatcher.getManifoldByIndexInternal(i);
RigidBody object1 = (RigidBody)manifold.getBody0();
RigidBody object2 = (RigidBody)manifold.getBody1();
CollisionObject physicsObject1 = (CollisionObject)object1.getUserPointer();
CollisionObject physicsObject2 = (CollisionObject)object2.getUserPointer();
boolean contact = false;
javax.vecmath.Vector3f normal = null;
for (int j = 0; j < manifold.getNumContacts(); j++) {
ManifoldPoint contactPoint = manifold.getContactPoint(j);
if (contactPoint.getDistance() < 0.0f) {
contact = true;
normal = contactPoint.normalWorldOnB;
break;
}
}
if (contact) {
System.out.println("hit");
}
}
}
}, null);
我是从某人那里得到的……不过我忘记了在哪里。所以，基本上什么都没有发生......我不确定，但也许我必须将对象添加到流形中，或者类似的东西。不知道该怎么做。有什么帮助吗？
编辑：我现在所做的是创建碰撞形状，就像一个随机大小的盒子：
CollisionShape result = new BoxShape(new Vector3f(10,10,10));
然后我创建了幽灵身体：
Transform transform = new Transform(new Matrix4f(new Quat4f(rotation.x, rotation.y, rotation.z, 1), position, scale));
this.transform = transform;
transform.origin.set(position);
GhostObject body = new GhostObject();
body.setCollisionShape(shape);
body.setWorldTransform(transform);
那我就照你说的做，它仍然没有返回“命中”；
int overlaps = player.getPhysics().getBody().getNumOverlappingObjects();
for(int i = 0; i < overlaps; i++){
//player.getPhysics().getBody().getOverlappingObject(i).
System.out.println("hit");
}
编辑2：
所以我在我的实体类中像这样创建对象：
if(collision){
physics = new PhysicsEntity(dynamicsWorld, model,new javax.vecmath.Vector3f(position.x, position.y, position.z), new javax.vecmath.Vector3f(rotX, rotY, rotZ), scale);
physics.updatePosition(new javax.vecmath.Vector3f(position.x, position.y, position.z));
physics.updateRotation(new javax.vecmath.Vector3f(rotX, rotY, rotZ));
}
并更新位置和内容：
public void increasePosition(float dx,float dy, float dz){
this.position.x += dx;
this.position.y += dy;
this.position.z += dz;
physics.updatePosition(new javax.vecmath.Vector3f(position.x, position.y, position.z));
}
public void increaseRotation(float dx, float dy, float dz){
this.rotX += dx;
this.rotY += dy;
this.rotZ += dz;
physics.updateRotation(new javax.vecmath.Vector3f(rotX, rotY, rotZ));
}
好的，这是我的 PhysicsEntity 类，我在其中设置它：
public PhysicsEntity(DynamicsWorld world, TexturedModel model, Vector3f position, Vector3f rotation, float scale){
this.model = model;
this.position = position;
this.rotation = rotation;
this.scale = scale;
shape = createShape();
body = createBody();
object = new CollisionObject();
object.setCollisionShape(shape);
world.addCollisionObject(body);
}
private GhostObject createBody(){
Transform transform = new Transform(new Matrix4f(new Quat4f(rotation.x, rotation.y, rotation.z, 1), position, scale));
this.transform = transform;
transform.origin.set(position);
GhostObject body = new GhostObject();
body.setCollisionShape(shape);
body.setWorldTransform(transform);
return body;
}
private CollisionShape createShape(){
CollisionShape result = new BoxShape(new Vector3f(10,10,10));
return result;
}
public void updatePosition(Vector3f position){
transform.origin.set(position);
body.setWorldTransform(transform);
}
public void updateRotation(Vector3f rotation){
transform.basis.set(new Quat4f(rotation.x, rotation.y, rotation.z, 1));
body.setWorldTransform(transform);
}
谢谢，