/// <summary>
/// Rotates a Visual3D object around the z-axis.
/// </summary>
/// <remarks>
/// The successive transformation operations (translation, scaling or rotation) are cumulative (the last one is relative to its previous one).
/// </remarks>
/// <param name="visual">A Visual3D object to rotate.</param>
/// <param name="angle">The angle of the z-axis rotation, in degrees.</param>
public void RotateZ(Visual3D visual, double angle)
{
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
Quaternion q = new Quaternion(new Vector3D(0, 0, 1) * matrix, angle);
matrix.RotateAt(q, (Point3D)visual.GetValue(PositionProperty));
visual.SetValue(MatrixPropertyKey, matrix);
ApplyTransform(visual);
}
/// <summary>
/// Scales a Visual3D object.
/// </summary>
/// <remarks>
/// The successive transformation operations (translation, scaling or rotation) are cumulative (the last one is relative to its previous one).
/// </remarks>
/// <param name="visual">A Visual3D object to scale.</param>
/// <param name="v">A vector containing the x-, y- and z-axis scale factors.</param>
public void Scale(Visual3D visual, Vector3D v)
{
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
matrix.ScaleAt(
v,
(Point3D)visual.GetValue(PositionProperty));
visual.SetValue(MatrixPropertyKey, matrix);
ApplyTransform(visual);
}
/// <summary>
/// Rotates a Visual3D object around the z-, y- and then x-axis.
/// </summary>
/// <remarks>
/// The successive transformation operations (translation, scaling or rotation) are cumulative (the last one is relative to its previous one).
/// </remarks>
/// <param name="visual">A Visual3D object to rotate.</param>
/// <param name="angleX">The angle of the x-axis rotation, in degrees.</param>
/// <param name="angleY">The angle of the y-axis rotation, in degrees.</param>
/// <param name="angleZ">The angle of the z-axis rotation, in degrees.</param>
public void RotateZYX(Visual3D visual, double angleX, double angleY, double angleZ)
{
Point3D position = (Point3D)visual.GetValue(PositionProperty);
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
matrix.RotateAt(new Quaternion(new Vector3D(0, 0, 1) * matrix, angleZ), position);
matrix.RotateAt(new Quaternion(new Vector3D(0, 1, 0) * matrix, angleY), position);
matrix.RotateAt(new Quaternion(new Vector3D(1, 0, 0) * matrix, angleX), position);
visual.SetValue(MatrixPropertyKey, matrix);
ApplyTransform(visual);
}
/// <summary>
/// Translates a Visual3D object.
/// </summary>
/// <remarks>
/// The successive transformation operations (translation, scaling or rotation) are cumulative (the last one is relative to its previous one).
/// </remarks>
/// <param name="visual">A Visual3D object to scale.</param>
/// <param name="v">A vector containing the x-, y- and z-axis offsets.</param>
public void Translate(Visual3D visual, Vector3D v)
{
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
matrix.Translate(v);
visual.SetValue(MatrixPropertyKey, matrix);
ApplyTransform(visual);
Point3D position = (Point3D)visual.GetValue(PositionProperty) + v;
visual.SetValue(PositionPropertyKey, position);
}
private HitTestResultBehavior HitTestCallback(HitTestResult result)
{
RayMeshGeometry3DHitTestResult rayHit = result as RayMeshGeometry3DHitTestResult;
ProjectionCamera camera = _viewport3D.Viewport.Camera as ProjectionCamera;
HitTestResultBehavior result2;
if (rayHit != null && rayHit.ModelHit != null)
{
Model3D model = rayHit.ModelHit;
Visual3D visual3D = rayHit.VisualHit;
if (visual3D != null)
{
if (string.Compare(Convert.ToString(visual3D.GetValue(FrameworkElement.NameProperty)), "CurveVisual") != 0)
{
result2 = HitTestResultBehavior.Continue;
return(result2);
}
}
MeshGeometry3D mesh = rayHit.MeshHit;
if (mesh != null)
{
Point3D p = mesh.Positions[rayHit.VertexIndex1];
Point3D p2 = mesh.Positions[rayHit.VertexIndex2];
Point3D p3 = mesh.Positions[rayHit.VertexIndex3];
double x = p.X * rayHit.VertexWeight1 + p2.X * rayHit.VertexWeight2 + p3.X * rayHit.VertexWeight3;
double y = p.Y * rayHit.VertexWeight1 + p2.Y * rayHit.VertexWeight2 + p3.Y * rayHit.VertexWeight3;
double z = p.Z * rayHit.VertexWeight1 + p2.Z * rayHit.VertexWeight2 + p3.Z * rayHit.VertexWeight3;
// point in local coordinates
Point3D localPoint = new Point3D(x, y, z);
Point3D p4 = localPoint;
// transform to global coordinates
// first transform the Model3D hierarchy
GeneralTransform3D t2 = Viewport3DHelper.GetTransform(rayHit.VisualHit, rayHit.ModelHit);
if (t2 != null)
{
p4 = t2.Transform(p4);
}
// then transform the Visual3D hierarchy up to the Viewport3D ancestor
GeneralTransform3D t3 = Viewport3DHelper.GetTransform(_viewport3D.Viewport, rayHit.VisualHit);
if (t3 != null)
{
p4 = t3.Transform(p4);
}
double distance = (camera.Position - p4).LengthSquared;
if (distance < _minimumDistance)
{
_minimumDistance = distance;
_nearestPt = localPoint;
_nearestNormal = Vector3D.CrossProduct(p2 - p, p3 - p);
_rayhit = rayHit;
}
}
}
result2 = HitTestResultBehavior.Continue;
return(result2);
}
private void ApplyTransform(Visual3D visual)
{
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
MatrixTransform3D previousMatrixTransform = (MatrixTransform3D)visual.GetValue(MatrixTransformProperty);
visual.SetValue(PreviousMatrixTransformPropertyKey, previousMatrixTransform);
// new instance because MatrixTransform3D may be frozen and can't accept a new matrix
MatrixTransform3D matrixTransform = new MatrixTransform3D(matrix);
visual.SetValue(MatrixTransformPropertyKey, matrixTransform);
if (visual.Transform != null)
{
if (visual.Transform is Transform3DGroup)
{
Transform3DGroup transformGroup = (Transform3DGroup)visual.Transform;
if (!transformGroup.Children.Contains(previousMatrixTransform))
{
transformGroup.Children.Add(matrixTransform);
}
else
{
int previousIndex = transformGroup.Children.IndexOf(previousMatrixTransform);
transformGroup.Children[previousIndex] = matrixTransform;
}
}
else
{
Transform3DGroup transformGroup = new Transform3DGroup();
transformGroup.Children.Add(visual.Transform);
transformGroup.Children.Add(matrixTransform);
visual.Transform = transformGroup;
}
}
else
{
visual.Transform = matrixTransform;
}
}
/// <summary>
/// Moves a Visual3D object to a new position. It updates the Position property.
/// </summary>
/// <remarks>
/// The successive transformation operations (translation, scaling or rotation) are cumulative (the last one is relative to its previous one).
/// </remarks>
/// <param name="visual">A Visual3D object to move.</param>
/// <param name="p">A Point3D object designing the new position.</param>
public void MoveTo(Visual3D visual, Point3D p)
{
Matrix3D matrix = (Matrix3D)visual.GetValue(MatrixProperty);
matrix.OffsetX = p.X;
matrix.OffsetY = p.Y;
matrix.OffsetZ = p.Z;
visual.SetValue(MatrixPropertyKey, matrix);
ApplyTransform(visual);
visual.SetValue(PositionPropertyKey, p);
}
/// <summary>
/// Gets the object space to world space transformation for the given Visual3D
/// </summary>
/// <param name="visual3DStart">The visual whose world space transform should be found</param>
/// <param name="viewport">The containing Viewport3D for the Visual3D</param>
/// <returns>The world space transformation</returns>
internal static Matrix3D GetWorldTransformationMatrix(Visual3D visual3DStart, out Viewport3DVisual viewport)
{
DependencyObject dependencyObject = visual3DStart;
Matrix3D worldTransform = Matrix3D.Identity;
while (dependencyObject != null)
{
Visual3D visual3D = dependencyObject as Visual3D;
// we reached the top
if (visual3D == null)
{
break;
}
Transform3D transform = (Transform3D)visual3D.GetValue(Visual3D.TransformProperty);
if (transform != null)
{
transform.Append(ref worldTransform);
}
dependencyObject = VisualTreeHelper.GetParent(dependencyObject);
}
if (dependencyObject != null)
{
viewport = (Viewport3DVisual)dependencyObject;
}
else
{
viewport = null;
}
return(worldTransform);
}
public static SelectablePrimitive GetPrimitiveData(Visual3D target)
{
return((SelectablePrimitive)target.GetValue(PrimitiveDataProperty));
}
