Camera rotation + model move

Last Update:2015-04-20 Source: Internet

Author: User

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When I first approached unity, I was in the state of what we were learning, and it was a rather stupid way to get a little bit of the Problem.There are two features that you want to accomplish, one is the camera rotates around all the models in the entire scene, the center of the rotation is the origin of the world coordinates, and the second is that the model can move with the mouse regardless of where the camera is Rotated.It is possible to use transform to rotate the camera around the world coordinate Origin independently. Rotatearound (vector3.zero, vector3.down, Mousemovex * time.deltatime). But the problem is, if it's just a single-direction rotation in the horizontal or vertical direction, simply use the Transform. Rotatearound (vector3.zero, vector3.down, Mousemovex * Time.deltatime) is possible, and if you need a mixed rotation in both horizontal and vertical directions, the problem arises, and the problem is Vector3.down. For the user, in the process of dragging and turning the mouse, the screen coordinates are the Subject. That is to say, this vector3.down for the user is the screen coordinates of the y-axis, only the first rotation of the screen coordinates x, y axis and world coordinates x, y axis is coincident, as long as the camera once rotated, screen coordinates and world coordinates will no longer coincide. So when you rotate multiple times, there is Confusion. Not only the rotation, but also the mouse to drag the model will be a serious deviation. This requires that the axis of rotation be corrected before each spin. My method is to add an empty gameobject to the camera in the x direction plus one and the y direction plus one to rotate it synchronously, as a directional marker. Before each rotation, obtain the world coordinates of the camera and two directional markers, and then calculate the direction vector of the screen axis in world coordinates to determine the Camera's rotation axis. The code is as Follows:<pre>1 usingunityengine;2 usingsystem.collections;3 4 public classScencerotate:monobehaviour {5 6Vector2 mousepositionbefore, mousepositionafter;//used to record the position of the mouse in order to calculate the rotation amplitude7 PrivateGameobject camera;//Saving camera Information8 PrivateGameobject xflaggameobject;//save information for x-directional markers9 PrivateGameobject yflaggameobject;//save information for y-directional markersTen PrivateVector3 xdirvector;//the direction vector of screen coordinates x direction in world coordinates one PrivateVector3 ydirvector;//the direction vector of the y-direction of screen coordinates in world coordinates a - //Use this for initialization - voidStart () the { - } - - //Update is called once per frame + voidUpdate () - { + if(input.getmousebuttondown (1))//detects if the right mouse button is pressed a { atXflaggameobject = Gameobject.find ("Xflag (Clone)"); -Yflaggameobject = Gameobject.find ("Yflag (Clone)"); -Camera = Gameobject.find ("Main Camera"); -Xdirvector = xflaggameobject.transform.position-camera.transform.position;//gets the direction vector of the x-direction of the screen coordinates in the world coordinate system -Ydirvector = yflaggameobject.transform.position-camera.transform.position;//gets the direction vector of the y-direction of the screen coordinates in the world coordinate system -Mousepositionbefore =NewVector2 (input.mouseposition.x, input.mouseposition.y);//record mouse position when right mouse button is pressed Mousepositionbefore in } - if(input.getmousebutton (1))//detects if the right mouse button is being pressed to { +Mousepositionafter =NewVector2 (input.mouseposition.x, input.mouseposition.y);//record the mouse position when you drag the right mouse button Mousepositionafter - //start spinning below the floatMousemovex = (mousepositionafter.x-mousepositionbefore.x) *0.1f; * floatMousemovey = (mousepositionafter.y-mousepositionbefore.y) *0.1f; $Transform. Rotatearound (vector3.zero, ydirvector, Mousemovex * time.deltatime);//rotate horizontally in the screen coordinate systemPanax NotoginsengTransform. Rotatearound (vector3.zero,-xdirvector, Mousemovey) * time.deltatime);//rotate in the vertical direction of the screen coordinate system - } the } +}</pre>Put the above script on the Camera. Model movement is the same way<pre>1 usingunityengine;2 usingsystem.collections;3 4 public classMove:monobehaviour5 {6 PrivateGameobject camera;//Saving camera Information7 PrivateGameobject xflaggameobject;//save information for x-directional markers8 PrivateGameobject yflaggameobject;//save information for y-directional markers9 PrivateVector3 xdirvector;//the direction vector of screen coordinates x direction in world coordinatesTen PrivateVector3 ydirvector;//the direction vector of the y-direction of screen coordinates in world coordinates one PrivateVector3 movemodel;//the moving vectors of the model in world coordinates a - //Use this for initialization - the voidStart () - { - - } + - //Update is called once per frame + a voidUpdate () at { - - } - - //The following function is called when the mouse touches a collision body or a rigid body, and my collider setting is mesh collider, and don't forget to add a physical material to the collider - //It is important to note that the world coordinate system is transformed into a screen coordinate system, and the z axis is Invariant. in IEnumerator OnMouseDown () - { toVector3 screenspace = Camera.main.WorldToScreenPoint (transform.position);//Converts an object from a world coordinate system to a screen coordinate system, stored by the VECTOR3 structure variable screenspace, to clarify the position of the z axis of the screen coordinate system +Vector3 offset = Transform.position-camera.main.screentoworldpoint (NewVector3 (input.mouseposition.x, input.mouseposition.y, screenspace.z));//completed two steps, 1 because the mouse coordinate system is 2-dimensional, need to convert to 3-dimensional World coordinate system, 2 only three-dimensional case to calculate the mouse position and object distance, offset is the distance - the //when the left mouse button is pressed * while(input.getmousebutton (0)) $ {Panax NotoginsengVector3 Curscreenspace =NewVector3 (input.mouseposition.x, input.mouseposition.y, screenspace.z);//get the 2-dimensional coordinate system position of the mouse now -Vector3 curposition = Camera.main.ScreenToWorldPoint (curscreenspace);//converts the 2-d position of the current mouse to a three-dimensional position the + //determine the direction of movement aXflaggameobject = Gameobject.find ("Xflag (Clone)"); theYflaggameobject = Gameobject.find ("Yflag (Clone)"); +Camera = Gameobject.find ("Main Camera"); -Xdirvector = xflagGameObject.transform.position-camera.transform.position; $Ydirvector = yflagGameObject.transform.position-camera.transform.position; $movemodel.x = xdirvector.x * offset.x + ydirvector.x *offset.x; -MOVEMODEL.Y = xdirvector.y * offset.y + ydirvector.y *offset.y; -movemodel.z = Xdirvector.z * offset.z + ydirvector.z *offset.z; theTransform.position =NewVector3 (curposition.x + movemodel.x, CURPOSITION.Y + movemodel.y, curposition.z +movemodel.z); - Wuyi //This is important . the yield return Newwaitforfixedupdate (); - } wu } -}</pre>The above is just a beginner's own solution, there should be a better way, the use of coordinate conversion may be OK and simple (i did not get out).Camera rotation + model move

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