From 3064a869cc2594b4f86b51378be34cb160a4f2c1 Mon Sep 17 00:00:00 2001
From: matteodelle <matteo.dellepiane@isti.cnr.it>
Date: Wed, 21 Jul 2010 15:54:31 +0000
Subject: [PATCH] Michele Sottile: added GetFovFromFocal

---
 vcg/math/shot.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/vcg/math/shot.h b/vcg/math/shot.h
index 4d6fe39d..57830806 100644
--- a/vcg/math/shot.h
+++ b/vcg/math/shot.h
@@ -169,6 +169,9 @@ public:
 	/// SET the viewpoint
 	void SetViewPoint(const vcg::Point3<S> & viewpoint);
 
+	/// GET fov from focal
+	float GetFovFromFocal();
+
 	/// look at (point+up)
 	void LookAt(const vcg::Point3<S> & point,const vcg::Point3<S> & up);
 
@@ -264,6 +267,16 @@ void Shot<S,RotationType>::SetViewPoint(const vcg::Point3<S> & viewpoint)
 }
 //---
 
+/// GET fov from focal
+template <class S, class RotationType>
+float Shot<S,RotationType>::GetFovFromFocal()
+{
+	double viewportYMm= Intrinsics.PixelSizeMm[1]* Intrinsics.ViewportPx[1];
+	return 2*(vcg::math::ToDeg(atanf(viewportYMm/(2*Intrinsics.FocalMm))));
+}
+
+//---
+
 /// GET the i-th axis of the coordinate system of the camera
 template <class S, class RotationType>
 vcg::Point3<S>  Shot<S,RotationType>::Axis(const int & i) const