private void OnCameraRotateStarted(object sender, EventArgs e)
{
var mousePosition = Mouse.GetPosition(ViewportBorder);
Point3D rotatedPosition; // Hit position or position on horizontal plane
var hitTestResult = VisualTreeHelper.HitTest(MainViewport, mousePosition) as RayMeshGeometry3DHitTestResult;
if (hitTestResult != null)
{
rotatedPosition = hitTestResult.PointHit;
}
else
{
// Get intersection of ray created from mouse position and the horizontal plane (position: 0,0,0; normal: 0,1,0)
bool hasIntersection = Camera1.GetMousePositionOnPlane(mousePosition, Constants.ZeroPoint3D, Constants.YAxis, out rotatedPosition);
if (!hasIntersection)
{
return;
}
}
PositionCross.Position = rotatedPosition;
PositionCross.IsVisible = true;
ShowCameraRotationHelpers();
}
private void UpdateSpherePosition(MouseEventArgs e)
{
Point mousePosition = e.GetPosition(MainViewport);
MousePositionValueTextBlock.Text = string.Format("{0:0}", mousePosition);
Point3D intersectionPoint;
// Get intersection of ray created from mouse position and the current plane
bool hasIntersection = Camera1.GetMousePositionOnPlane(mousePosition, _pointOnPlane, _planeNormal, out intersectionPoint);
// The GetMousePositionOnPlane uses the CreateMouseRay3D that creates a ray from a current camera and mouse position.
// You can also use that method file the following code:
//Point3D rayOrigin;
//Vector3D rayDirection;
//// Calculate the 3D ray that goes from the mouse position into the 3D scene
//bool success = Camera1.CreateMouseRay3D(mousePosition, out rayOrigin, out rayDirection);
if (hasIntersection)
{
double planeLimits = PlaneVisual.Size.Width / 2;
// We limit the area where we can position the sphere to the area defined by PlaneVisual
if (Math.Abs(intersectionPoint.Z) > planeLimits || Math.Abs(intersectionPoint.X) > planeLimits)
{
PlanePositionValueTextBlock.Text = "(out of bounds)";
Sphere1.IsVisible = false;
}
else
{
// Position the sphere
// NOTE:
// We are using transform to position the sphere
// This is much more efficient than changing the Sphere's CenterPosition - this would recreate the whole geometry
SphereTransform.OffsetX = intersectionPoint.X;
SphereTransform.OffsetY = intersectionPoint.Y;
SphereTransform.OffsetZ = intersectionPoint.Z;
Sphere1.IsVisible = true;
PlanePositionValueTextBlock.Text = string.Format("{0:0}", intersectionPoint);
}
}
else
{
Sphere1.IsVisible = false;
PlanePositionValueTextBlock.Text = "(no intersection)";
}
}
