/// <summary>
/// Find the Perspective viewport in the 3dm file and sets up the default view.
/// </summary>
public void LoadCamera()
{
if (App.Manager.CurrentModel == null)
{
return;
}
Camera = new ViewportInfo();
bool cameraIsInitialized = false;
int viewCount = App.Manager.CurrentModel.ModelFile.Views.Count;
// find first perspective viewport projection in file
if (viewCount > 0)
{
foreach (var view in App.Manager.CurrentModel.ModelFile.Views)
{
if (view.Viewport.IsPerspectiveProjection)
{
cameraIsInitialized = true;
Camera = view.Viewport;
Camera.TargetPoint = view.Viewport.TargetPoint;
Camera.SetScreenPort(0, (int)View.Bounds.Size.Width, 0, (int)View.Bounds.Size.Height, 1, 1000);
Camera.FrustumAspect = Camera.ScreenPortAspect;
Camera.SetFrustumNearFar(App.Manager.CurrentModel.BBox);
break;
}
}
}
// If there isn't one, then cook up a viewport from scratch...
if (!cameraIsInitialized)
{
Camera.SetScreenPort(0, (int)View.Bounds.Size.Width, 0, (int)View.Bounds.Size.Height, 1, 1000);
Camera.TargetPoint = new Rhino.Geometry.Point3d(0, 0, 0);
var plane = new Rhino.Geometry.Plane(Rhino.Geometry.Point3d.Origin, new Rhino.Geometry.Vector3d(-1, -1, -1));
Camera.SetCameraLocation(new Rhino.Geometry.Point3d(10, 10, 10));
var dir = new Rhino.Geometry.Vector3d(-1, -1, -1);
dir.Unitize();
Camera.SetCameraDirection(dir);
Camera.SetCameraUp(plane.YAxis);
Camera.SetFrustum(-1, 1, -1, 1, 0.1, 1000);
Camera.FrustumAspect = Camera.ScreenPortAspect;
Camera.IsPerspectiveProjection = true;
Camera.Camera35mmLensLength = 50;
if (App.Manager.CurrentModel != null)
{
if (App.Manager.CurrentModel.AllMeshes != null)
{
Camera.DollyExtents(App.Manager.CurrentModel.AllMeshes, 1.0);
}
}
}
}
/// <summary>
/// Rotates a viewport about an axis relative to a center point
/// </summary>
public static void RotateView(this ViewportInfo viewport, Rhino.Geometry.Vector3d axis, Rhino.Geometry.Point3d center, double angle)
{
Rhino.Geometry.Point3d cameraLocation = viewport.CameraLocation;
Rhino.Geometry.Vector3d cameraY = viewport.CameraY;
Rhino.Geometry.Vector3d cameraZ = viewport.CameraZ;
Rhino.Geometry.Transform rotation = Rhino.Geometry.Transform.Rotation(angle, axis, center);
cameraLocation = rotation * cameraLocation;
cameraY = rotation * cameraY;
cameraZ = -(rotation * cameraZ);
viewport.SetCameraLocation(cameraLocation);
viewport.SetCameraDirection(cameraZ);
viewport.SetCameraUp(cameraY);
}
/// <summary>
/// Sets the viewport's camera location, target and up vector
/// </summary>
public static void SetTarget(this ViewportInfo viewport, Rhino.Geometry.Point3d targetLocation, Rhino.Geometry.Point3d cameraLocation, Rhino.Geometry.Vector3d cameraUp)
{
Rhino.Geometry.Vector3d cameraDirection = targetLocation - cameraLocation;
cameraDirection.Unitize();
if (!viewport.CameraDirection.IsTiny())
{
Rhino.Geometry.Vector3d cameraDirection0 = -viewport.CameraZ;
Rhino.Geometry.Vector3d cameraY = viewport.CameraY;
const double tiltAngle = 0;
viewport.SetCameraLocation(cameraLocation);
viewport.SetCameraDirection(cameraDirection);
bool didSetTarget = false;
didSetTarget = viewport.SetCameraUp(cameraUp);
if (!didSetTarget)
{
didSetTarget = viewport.SetCameraUp(cameraY);
cameraUp = cameraY;
}
if (!didSetTarget)
{
Rhino.Geometry.Vector3d rotationAxis = Rhino.Geometry.Vector3d.CrossProduct(cameraDirection0, cameraDirection);
double sinAngle = rotationAxis.Length;
double cosAngle = cameraDirection0 * cameraDirection;
Rhino.Geometry.Transform rot = Rhino.Geometry.Transform.Rotation(sinAngle, cosAngle, rotationAxis, Rhino.Geometry.Point3d.Origin);
cameraUp = rot * cameraY;
didSetTarget = viewport.SetCameraUp(cameraUp);
}
if (didSetTarget)
{
// Apply tilt angle to new camera and target location
if (Math.Abs(tiltAngle) > 1.0e-6)
{
Rhino.Geometry.Transform rot = Rhino.Geometry.Transform.Rotation(tiltAngle, -cameraDirection0, cameraLocation);
cameraUp = rot * cameraUp;
didSetTarget = viewport.SetCameraUp(cameraUp);
}
if (didSetTarget)
{
viewport.TargetPoint = targetLocation;
}
}
}
}
/// <summary>
/// Rotates the viewport around an axis by an angle
/// </summary>
public static void RotateCameraAround(this ViewportInfo viewport, Rhino.Geometry.Vector3d axis, double angle)
{
Rhino.Geometry.Point3d cameraLocation = viewport.CameraLocation;
double targetDistance = (cameraLocation - viewport.TargetPoint) * viewport.CameraZ;
Rhino.Geometry.Transform rotationTransform = Rhino.Geometry.Transform.Rotation(angle, axis, cameraLocation);
Rhino.Geometry.Vector3d cameraDirection = -(rotationTransform * viewport.CameraZ);
if (cameraDirection.Z >= -0.99 && cameraDirection.Z <= 0.99) // avoid gimbal "lock"
{
Rhino.Geometry.Point3d target = cameraLocation + targetDistance * cameraDirection;
viewport.TargetPoint = target;
viewport.SetCameraLocation(cameraLocation);
viewport.SetCameraDirection(cameraDirection);
viewport.SetCameraUp(Rhino.Geometry.Vector3d.ZAxis);
}
}