public virtual void ComputeViewMatrix()
{
double lat1 = _latitude.Degrees;
double lon1 = _longitude.Degrees;
EyeDiff.X = SMath.DegreesToRadians(_latitude.Degrees - lat1);
EyeDiff.Y = SMath.DegreesToRadians(_longitude.Degrees - lon1);
ReferenceCenter = SMath.SphericalToCartesianV3D(
_latitude.Degrees,
_longitude.Degrees,
WorldRadius);
if (World.Settings.Project == Projection.OrthoGraghics)
{
//lat1 = 0;
//lon1 = 0;
EyeDiff.X = 0;
EyeDiff.Y = 0;
}
Vector3d defaultPosition = SMath.SphericalToCartesianV3D(lat1, lon1, _worldRadius);
m_ViewMatrix = Matrix4d.LookAtRH(
defaultPosition,
Vector3d.Empty,
cameraUpVector);
//TODO JHJ 这是干什么的 有什么用
m_ViewMatrix *= Matrix4d.Translation(0, 0, _worldRadius);
m_ViewMatrix *= Matrix4d.RotationYawPitchRoll(-EyeDiff.Y, EyeDiff.X, 0);
m_ViewMatrix *= Matrix4d.Translation(0, 0, -_worldRadius);
m_ViewMatrix *= Matrix4d.RotationYawPitchRoll(
0,
-_tilt.Radians,
this._heading.Radians);
m_ViewMatrix *= Matrix4d.Translation(0, 0, (-this._distance));
if (World.Settings.Project == Projection.Perspective)
{
m_ViewMatrix *= Matrix4d.RotationZ(this._bank.Radians);
}
else
{
m_ViewMatrix *= Matrix4d.RotationZ(this._bank.Radians);
}
// Extract camera position
Matrix4d cam = Matrix4d.Invert(m_ViewMatrix);
_position = new Vector3d(cam[3, 0], cam[3, 1], cam[3, 2]);
}
public static Matrix4d RotationYawPitchRoll(double yaw, double pitch, double roll)
{
//Matrix4d test = ConvertDX.ToMatrix4d(Microsoft.DirectX.Matrix.RotationYawPitchRoll((float)yaw, (float)pitch, (float)roll));
// This can be simplified to a single matrix constructor by hand if it becomes a performance issue
Matrix4d rollMat = Matrix4d.RotationZ(roll);
Matrix4d pitchMat = Matrix4d.RotationX(pitch);
Matrix4d yawMat = Matrix4d.RotationY(yaw);
Matrix4d solution = rollMat * pitchMat * yawMat;
return(solution);
}
