[OgreVersion( 1, 7, 2790, "Slightly different" )]public void GetCameraToViewportRay( float screenX, float screenY, out Ray ray ){var inverseVP = ( _projectionMatrix*_viewMatrix ).Inverse();#if !AXIOM_NO_VIEWPORT_ORIENTATIONMODE// We need to convert screen point to our oriented viewport (temp solution)Real tX = screenX;Real a = (int)OrientationMode*System.Math.PI*0.5f;screenX = System.Math.Cos( a )*( tX - 0.5f ) + System.Math.Sin( a )*( screenY - 0.5f ) + 0.5f;screenY = System.Math.Sin( a )*( tX - 0.5f ) + System.Math.Cos( a )*( screenY - 0.5f ) + 0.5f;if ( ( ( (int)OrientationMode ) & 1 ) == 1 ){screenY = 1.0f - screenY;}
#endifReal nx = ( 2.0f*screenX ) - 1.0f;Real ny = 1.0f - ( 2.0f*screenY );var nearPoint = new Vector3( nx, ny, -1.0f );// Use midPoint rather than far point to avoid issues with infinite projectionvar midPoint = new Vector3( nx, ny, 0.0f );// Get ray origin and ray target on near plane in world spacevar rayOrigin = inverseVP*nearPoint;var rayTarget = inverseVP*midPoint;var rayDirection = rayTarget - rayOrigin;rayDirection.Normalize();ray = new Ray( rayOrigin, rayDirection );}

        public void HitTest(Ray ray){foreach (var p in this){Sphere sphere = new Sphere(this.Parent.PointNode.FullTransform * p.VertexInfo.Position, this.Scale);var result = Utility.Intersects(ray, sphere);if (result.Hit){this.SelectPoint = p;break;}}}

        /// <summary>/// 3D数学基础:图形与游戏开发 里的算法,二射线相交检测/// </summary>/// <param name="ray1"></param>/// <param name="ray2"></param>/// <param name="deviation">ray1与ray2最近距离误差范围</param>/// <returns></returns>public static Tuple<bool, Real, Real, Vector3, Vector3> RayIntersectsRay(this Ray ray1, Ray ray2, float deviation){var OfO = ray2.Origin - ray1.Origin;var DxD = ray1.Direction.Cross(ray2.Direction);//平行if (DxD == Vector3.Zero){//1重合,2不重合,重合也相当于hit.float limit = 0.00001f;var t = ray2.Origin.x - ray1.Origin.x;var v = ray1.Origin + ray1.Direction * t;//查看ray2.Origin是否在ray1.Origin射线中if (v.DifferenceLessThan(ray2.Origin, limit)){return Tuple.Create(true, (Real)t, (Real)0, v, ray2.Origin);}return Tuple.Create(false, (Real)0, (Real)0, Vector3.Invalid, Vector3.Invalid);}else{var t1 = OfO.Cross(ray2.Direction).Dot(DxD) / DxD.Dot(DxD);var t2 = OfO.Cross(ray1.Direction).Dot(DxD) / DxD.Dot(DxD);var p1 = ray1.Origin + ray1.Direction * t1;var p2 = ray2.Origin + ray2.Direction * t2;bool bHit = (p1 - p2).Length < deviation;return Tuple.Create(bHit, t1, t2, p1, p2);}}

       public void HitTest(Ray ray){foreach (var line in this){var p1 = this.Parent.LineNode.FullTransform * this.Parent[line.Index[0]];var p2 = this.Parent.LineNode.FullTransform * this.Parent[line.Index[1]];//3D数学基础:图形与游戏开发 里的算法,二射线相交检测//s1 ray s2 (p1 + (p2-p1)*t)Ray ray0 = new Ray(p1, (p2 - p1).ToNormalized());var hitResult = ray0.RayIntersectsRay(ray, this.Scale);if (hitResult.Item1){var t = hitResult.Item2;if (t >= 0 && t <= (p2 - p1).Length){this.SelectLine = line;break;}}}}

       public void HitTest(Ray ray){foreach (var surface in this){foreach (var tri in surface.Triangles){var matrix = this.Parent.LineNode.FullTransform;var p1 = matrix * this.Parent[tri.sharedVertIndex[0]];var p2 = matrix * this.Parent[tri.sharedVertIndex[1]];var p3 = matrix * this.Parent[tri.sharedVertIndex[2]];var result = ray.RayIntersectsTriangle(p1, p2, p3);if (result.Item1){this.SelectSurface = surface;break;}}}}public static System.Tuple<bool, Vector3> RayIntersectsTriangle(this Ray ray, Vector3 a, Vector3 b, Vector3 c){// Place the end beyond any conceivable triangle, 1000 meters awayvar start = ray.Origin;var end = start + ray.Direction * 1000000f;var pq = end - start;var pa = a - start;var pb = b - start;var pc = c - start;// Test if pq is inside the edges bc, ca and ab. Done by testing// that the signed tetrahedral volumes, computed using scalar triple// products, are all positivevar result = Tuple.Create(false, Vector3.Invalid);float u = pq.Cross(pc).Dot(pb);if (u < 0.0f){return result;}float v = pq.Cross(pa).Dot(pc);if (v < 0.0f){return result;}float w = pq.Cross(pb).Dot(pa);if (w < 0.0f){return result;}var denom = 1.0f / (u + v + w);// Finally fill in the intersection pointvar where = (u * a + v * b + w * c) * denom;return Tuple.Create(true, where);}

if (EngineCore.Instance.ActionType != ActionType.None)
{EngineCore.Instance.Select = true;//hitD = this.Camera;this.viewZ = this.Camera.FrustumPlanes[0].GetDistance(node.DerivedPosition);}

        public override void MouseMove(MouseEventArgs e){int offsetX = e.X - prePoint.X;int offsetY = e.Y - prePoint.Y;if (offsetX == 0 && offsetY == 0)return;if (Control.MouseButtons == MouseButtons.Left){if (EngineCore.Instance.Select){var node = EngineCore.Instance.ViewNode;if (EngineCore.Instance.ActionType == ActionType.Translate){var ray = this.CreateViewportRay(e.X, e.Y);var pos = ray.Origin + ray.Direction * this.viewZ;node.DerivedPosition = pos;}else if (EngineCore.Instance.ActionType == ActionType.Rotate){node.Yaw((Real)(new Degree((Real)(offsetX * 0.15f))));node.Pitch((Real)(new Degree((Real)(offsetY * 0.15f))));}else if (EngineCore.Instance.ActionType == ActionType.Scale){}}else{Real dist = (this.camera.Position - EngineCore.Instance.ViewNode.DerivedPosition).Length;this.camera.Position = EngineCore.Instance.ViewNode.DerivedPosition;this.camera.Yaw((Real)(new Degree((Real)(-offsetX * 0.25f))));this.camera.Pitch((Real)(new Degree((Real)(-offsetY * 0.25f))));this.camera.MoveRelative(new Vector3(0, 0, dist));EngineCore.Instance.AxisNode.Yaw((Real)(new Degree((Real)(-offsetX * 0.25f))));EngineCore.Instance.AxisNode.Pitch((Real)(new Degree((Real)(-offsetY * 0.25f))));}}this.renderWindow.Update();prePoint = e.Location;base.MouseMove(e);}