public void Begin()
{
Vector3 pos = new Vector3();
Vector3 dir = new Vector3();
Vector3 point_in_plane = new Vector3();
pos = MdxRender.Camera.Position;
dir = MdxRender.Camera.LookVector;
intersectPlane.A = dir.X;
intersectPlane.B = dir.Y;
intersectPlane.C = dir.Z;
intersectPlane = Plane.Normalize(intersectPlane);
//calculate the coordinate that is 20 units directly in front of camera
point_in_plane.X = pos.X + dir.X * 20;
point_in_plane.Y = pos.Y + dir.Y * 20;
point_in_plane.Z = pos.Z + dir.Z * 20;
Trace.WriteLine("cam_loc = " + pos.ToString());
Trace.WriteLine("cam_dir = " + dir.ToString());
Trace.WriteLine("point in plane = " + point_in_plane.ToString());
//distance here is from the point to the origin, not the nearest distance from plane to origin...need to fix
intersectPlane.D = (point_in_plane.X * intersectPlane.A + point_in_plane.Y * intersectPlane.B + point_in_plane.Z * intersectPlane.C);
Trace.WriteLine("intersect plane = " + intersectPlane.ToString());
//todo: get the optimal intersect plane based on camera orientation
currentState = SelectionBoxState.FindPlane;
}
public void Click(Vector3 origin, Vector3 dir)
{
switch (currentState)
{
case SelectionBoxState.FindPlane:
if (PMath.RayIntersectPlane(origin, dir, intersectPlane, out startCorner))
{
basePlane.D = startCorner.Z;
currentState = SelectionBoxState.FindStartCorner;
}
break;
case SelectionBoxState.FindStartCorner:
PMath.RayIntersectPlane(origin, dir, basePlane, out startCorner);
currentState = SelectionBoxState.FindEndCorner;
break;
case SelectionBoxState.FindEndCorner:
PMath.RayIntersectPlane(origin, dir, basePlane, out endCorner);
currentState = SelectionBoxState.FindHeight;
break;
case SelectionBoxState.FindHeight:
Vector3 temp = new Vector3();
if (PMath.RayIntersectPlane(origin, dir, intersectPlane, out temp))
{
boxHeight = temp.Z - startCorner.Z;
}
//todo: calc new vertical intersectPlane based on endCorner
currentState = SelectionBoxState.Active;
break;
case SelectionBoxState.Active:
//todo: if clicked outside of bounding box model, deselect it
currentState = SelectionBoxState.Inactive;
break;
}
Trace.WriteLine(string.Format("Selection Box State: {0}", currentState));
Trace.WriteLine(string.Format("start: {0} {1} {2}", startCorner.X, startCorner.Y, startCorner.Z));
Trace.WriteLine(string.Format("end : {0} {1} {2}", endCorner.X, endCorner.Y, endCorner.Z));
}
