(obj.v0.up<0&&obj.flag_standonground==0&&((obj.py0-obj.mesh.position.y)<(-obj.mchange.up)/5)) 5 { 6 obj.v0.up=0; 7 obj.flag_standonground=1;//表示接触地面 obj.vm.up=5; 10 obj.vm.down=5; 11 } (obj.flag_standonground==1&&((obj.py0-obj.mesh.position.y)>(-obj.mchange.up)/5))//遇到了一个坑 13 { 14 obj.flag_standonground=0; 15 obj.witha.up=-9.82; 16 obj.vm.up=100; 17 obj.vm.down=100; 18 } 19 obj.witha2.up = obj.witha.up; obj.vt.up = obj.v0.up + obj.witha2.up * schange;((0 < obj.vt.up && obj.vt.up < obj.vm.up) || (0 > obj.vt.up && obj.vt.up > -obj.vm.down)) { } (obj.vm.up <= obj.vt.up) { 27 obj.vt.up = obj.vm.up; 28 obj.mchange.up = obj.vt.up * schange; 29 } (-obj.vm.down >= obj.vt.up) { 31 obj.vt.up = -obj.vm.down; 32 obj.mchange.up = obj.vt.up * schange; 33 } 34 } 35 else { 36 obj.mchange.up = obj.v0.up * schange; 37 }

　　Babylon初级教程中提供了两种现成的碰撞检测方法，其中一种能够较精确的检测到物体掉落在地面上，但不支持事件响应或者回调函数；另一种支持事件响应，但物体的碰撞检测边界太过粗糙，无法精确检测碰撞。所以我只好用“有没有在该方向上移动应有的距离”来暂时代替碰撞检测。

4、应用位移：

obj.v0.forward = obj.vt.forward; 3 obj.v0.left = obj.vt.left; 4 obj.v0.up = obj.vt.up; (obj.v0.forward < 0.002 && obj.v0.forward > -0.002) { 7 obj.v0.forward = 0; 8 obj.mchange.forward=0; 9 } 10 if (obj.v0.left < 0.002 && obj.v0.left > -0.002) { 11 obj.v0.left = 0; 12 obj.mchange.left=0; 13 } 14 if (obj.v0.up < 0.002 && obj.v0.up > -0.002) { 15 obj.v0.up = 0; 16 obj.mchange.up=0; 17 } 18 if(obj.mchange.forward<0.002&& obj.mchange.forward > -0.002) 19 { 20 obj.mchange.forward=0; 21 } 22 if(obj.mchange.left<0.002&& obj.mchange.left > -0.002) 23 { 24 obj.mchange.left=0; 25 } 26 if(obj.mchange.up<0.002&& obj.mchange.up > -0.002) 27 { 28 obj.mchange.up=0; 29 } obj.py0=obj.mesh.position.y; 32 var vectir1=(new BABYLON.Vector3(parseFloat(Math.sin(parseFloat(obj.mesh.rotation.y))) * obj.mchange.forward * obj.flag_runfast, 33 0, parseFloat(Math.cos(parseFloat(obj.mesh.rotation.y))) * obj.mchange.forward * obj.flag_runfast)).negate(); 34 var vectir2=new BABYLON.Vector3(-parseFloat(Math.cos(parseFloat(obj.mesh.rotation.y))) * obj.mchange.left * obj.flag_runfast, 35 0, parseFloat(Math.sin(parseFloat(obj.mesh.rotation.y))) * obj.mchange.left * obj.flag_runfast).negate(); 36 var vectir3=new BABYLON.Vector3(0, obj.mchange.up * obj.flag_runfast, 0); 37 obj.vmove = vectir1.add(vectir2).add(vectir3); ((obj.vmove.x!=0||obj.vmove.y!=0||obj.vmove.z!=0)) 40 { }