Panda3D: 检测两个不规则六面体是否重叠 - 代码示例和解释

以下是使用Panda3D计算两个不规则六面体是否存在重叠部分的完整代码示例：\n\npython\nfrom panda3d.core import Point3, GeomVertexFormat, GeomVertexData, Geom, GeomNode, GeomTriangles, GeomVertexWriter\nfrom panda3d.core import CollisionTraverser, CollisionNode, CollisionHandlerQueue, CollisionRay\n\nfrom direct.showbase.ShowBase import ShowBase\nfrom direct.task import Task\n\n\nclass MyApp(ShowBase):\n def __init__(self):\n ShowBase.__init__(self)\n\n # 创建两个不规则六面体的顶点数据\n vertex_data_1 = GeomVertexData('vertex_data_1', GeomVertexFormat.get_v3(), Geom.UH_static)\n vertex_data_2 = GeomVertexData('vertex_data_2', GeomVertexFormat.get_v3(), Geom.UH_static)\n\n vertex_writer_1 = GeomVertexWriter(vertex_data_1, 'vertex')\n vertex_writer_2 = GeomVertexWriter(vertex_data_2, 'vertex')\n\n # 顶点坐标\n vertices_1 = [\n Point3(-1, -1, -1),\n Point3(1, -1, -1),\n Point3(1, 1, -1),\n Point3(-1, 1, -1),\n Point3(-1, -1, 1),\n Point3(1, -1, 1),\n Point3(1, 1, 1),\n Point3(-1, 1, 1)\n ]\n\n vertices_2 = [\n Point3(-1, -1, -1),\n Point3(1, -1, -1),\n Point3(1, 1, -1),\n Point3(-1, 1, -1),\n Point3(-1, -1, 1),\n Point3(1, -1, 1),\n Point3(1, 1, 1),\n Point3(-1, 1, 1)\n ]\n\n # 写入顶点数据\n for vertex in vertices_1:\n vertex_writer_1.addData3f(vertex)\n\n for vertex in vertices_2:\n vertex_writer_2.addData3f(vertex)\n\n # 创建两个不规则六面体的几何体\n geom_1 = Geom(vertex_data_1)\n geom_2 = Geom(vertex_data_2)\n\n # 创建顶点索引\n prim_1 = GeomTriangles(Geom.UH_static)\n prim_2 = GeomTriangles(Geom.UH_static)\n\n # 顶点索引数据\n prim_1.addVertices(0, 1, 2)\n prim_1.addVertices(2, 3, 0)\n prim_1.addVertices(4, 5, 6)\n prim_1.addVertices(6, 7, 4)\n\n prim_2.addVertices(0, 1, 2)\n prim_2.addVertices(2, 3, 0)\n prim_2.addVertices(4, 5, 6)\n prim_2.addVertices(6, 7, 4)\n\n # 添加几何体\n geom_1.addPrimitive(prim_1)\n geom_2.addPrimitive(prim_2)\n\n # 创建节点\n node_1 = GeomNode('geom_node_1')\n node_2 = GeomNode('geom_node_2')\n\n # 添加几何体到节点\n node_1.addGeom(geom_1)\n node_2.addGeom(geom_2)\n\n # 创建节点路径\n np_1 = render.attachNewNode(node_1)\n np_2 = render.attachNewNode(node_2)\n\n # 移动节点位置\n np_1.setPos(0, 0, 0)\n np_2.setPos(1.5, 0, 0)\n\n # 添加碰撞检测\n self.collision_traverser = CollisionTraverser()\n self.collision_handler = CollisionHandlerQueue()\n\n self.collision_ray_1 = CollisionRay()\n self.collision_ray_1.setOrigin(0, 0, 0)\n self.collision_ray_1.setDirection(1, 0, 0)\n\n self.collision_ray_2 = CollisionRay()\n self.collision_ray_2.setOrigin(1.5, 0, 0)\n self.collision_ray_2.setDirection(-1, 0, 0)\n\n collision_node_1 = CollisionNode('collision_node_1')\n collision_node_1.addSolid(self.collision_ray_1)\n\n collision_node_2 = CollisionNode('collision_node_2')\n collision_node_2.addSolid(self.collision_ray_2)\n\n np_1.attachNewNode(collision_node_1)\n np_2.attachNewNode(collision_node_2)\n\n self.collision_traverser.addCollider(collision_node_1, self.collision_handler)\n self.collision_traverser.addCollider(collision_node_2, self.collision_handler)\n\n # 注册任务\n self.taskMgr.add(self.check_collision, 'check_collision')\n\n def check_collision(self, task):\n self.collision_traverser.traverse(render)\n\n if self.collision_handler.getNumEntries() > 0:\n print("有重叠部分")\n else:\n print("没有重叠部分")\n\n return Task.done\n\n\napp = MyApp()\nApp.run()\n\n\n这段代码使用了Panda3D的几何体、碰撞检测和任务管理功能。它创建了两个不规则六面体的顶点数据，并使用几何体和顶点索引定义了它们的形状。然后，添加了碰撞检测以检测两个不规则六面体之间是否存在重叠部分。最后，通过任务管理器来执行碰撞检测的任务，并根据检测结果输出相应的信息。