public static Ray HitTestRayFromScreenPos(this ARSCNView sceneView, CGPoint point)
{
//if (sceneView.Session == null || ViewController.CurrentFrame == null)
//{
// return null;
//}
var frame = ARGamePlay.CurrentFrame;
//var frame = ViewController.CurrentFrame;
if (frame == null || frame.Camera == null || frame.Camera.Transform == null)
{
return(null);
}
var cameraPos = SCNVector3Ex.PositionFromTransform(frame.Camera.Transform);
// Note: z: 1.0 will unproject() the screen position to the far clipping plane.
var positionVec = new SCNVector3((float)point.X, (float)point.Y, 1.0f);
var screenPosOnFarClippingPlane = sceneView.UnprojectPoint(positionVec);
var rayDirection = screenPosOnFarClippingPlane - cameraPos; //screenPosOnFarClippingPlane.Subtract(cameraPos);
rayDirection.Normalize();
return(new Ray(cameraPos, rayDirection));
}
public static HitTestRay HitTestRayFromScreenPos(this ARSCNView self, CGPoint point)
{
if (self.Session == null || ViewController.CurrentFrame == null)
{
return(null);
}
var frame = ViewController.CurrentFrame;
if (frame?.Camera?.Transform == null)
{
return(null);
}
SCNVector3 cameraPos;
try
{
//TODO: why iPhone 7 plus crash on this?
cameraPos = SCNVector3Extensions.PositionFromTransform(frame.Camera.Transform);
}
catch (Exception)
{
return(null);
}
// Note: z: 1.0 will unproject() the screen position to the far clipping plane.
var positionVec = new SCNVector3((float)point.X, (float)point.Y, 1.0f);
var screenPosOnFarClippingPlane = self.UnprojectPoint(positionVec);
var rayDirection = screenPosOnFarClippingPlane.Subtract(cameraPos);
rayDirection.Normalize();
return(new HitTestRay(cameraPos, rayDirection));
}
public static HitTestRay?HitTestRayFromScreenPosition(this ARSCNView view, CGPoint point)
{
HitTestRay?result = null;
using (var frame = view.Session.CurrentFrame)
{
if (frame != null)
{
var cameraPosition = frame.Camera.Transform.GetTranslation();
// Note: z: 1.0 will unproject() the screen position to the far clipping plane.
var positionVector = new SCNVector3((float)point.X, (float)point.Y, 1f);
var screenPositionOnFarClippingPlane = view.UnprojectPoint(positionVector);
var rayDirection = SCNVector3.Normalize(screenPositionOnFarClippingPlane - cameraPosition);
result = new HitTestRay {
Origin = cameraPosition, Direction = rayDirection
};
}
}
return(result);
}
