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added LookAt,LookToward

This commit is contained in:
ganovelli 2004-10-07 14:24:53 +00:00
parent 23b83d0a7e
commit eaea30aa5e
1 changed files with 64 additions and 20 deletions
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84
vcg/math/shot.h
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@ -23,6 +23,9 @@
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.2 2004/10/05 19:04:25 ganovelli
version 5-10-2004 in progress
Revision 1.1 2004/09/15 22:58:05 ganovelli
re-creation
@ -53,19 +56,35 @@ class Shot {
public:
typedef Camera<S> CameraType;
typedef S ScalarType;
enum {
NOTVALID_BIT = 0x1
};
char flags;
bool IsValid(){ return (flags& NOTVALID_BIT)==0;}
void SetValid(bool v){ if(!v) flags|=NOTVALID_BIT; else flags&=~NOTVALID_BIT;}
Camera<S> & camera; // the camera that shot
vcg::Similarity<S> similarity; // the position from where it did it
vcg::Similarity<S,vcg::Matrix44f> similarity; // the position from where it did it
Shot( Camera<S> & c):camera(c){}
Camera<S> & Camera(){return camera;};
/// take the i-th axis of the coordinate system of the camera
vcg::Point3<S>const & Axis(const int & i)const { vcg::Matrix44<S> m; similarity.rot.ToMatrix(m); return m.Column3(i);}
vcg::Point3<S> Axis(const int & i)const;
/// take the viewpoint
vcg::Point3<S>const & ViewPoint();
vcg::Point3<S> const &ViewPoint();
/// set the viewpoint
void SetViewPoint(const vcg::Point3<S> & viewpoint);
/// look at
void LookAt(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up);
/// look at
void LookTowards(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up);
/// convert a 3d point in camera coordinates
vcg::Point3<S> ConvertToCameraCoordinates(const vcg::Point3<S> & p) const;
@ -80,24 +99,49 @@ public:
template <class S>
vcg::Point3<S>const & Shot<S>::ViewPoint(){
Matrix44 m = similarity.Matrix();
return Point3<S>(m[0][3],m[1][3],m[2][3]);
//Matrix44<S> m = similarity.Matrix();
//return Point3<S>(m[0][3],m[1][3],m[2][3]);
return -similarity.tra;
}
template <class S>
vcg::Point3<S> Shot<S>::Axis(const int & i) const {
vcg::Matrix44<S> m;
similarity.rot.ToMatrix(m);
vcg::Point3f aa = m.Row3(i);
return aa;
}
template <class S>
void Shot<S>::SetViewPoint(const vcg::Point3<S> & viewpoint){
similarity.tra = -viewpoint;
}
template <class S>
void Shot<S>::LookAt(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up){
LookTowards(z_dir-ViewPoint(),up);
}
template <class S>
void Shot<S>::LookTowards(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up){
vcg::Point3<S> x_dir = up ^-z_dir ;
vcg::Point3<S> y_dir = -z_dir ^x_dir ;
Matrix44<S> m;
m.SetIdentity();
*(vcg::Point3<S> *)&m[0][0] = x_dir/x_dir.SquaredNorm();
*(vcg::Point3<S> *)&m[1][0] = y_dir/y_dir.SquaredNorm();
*(vcg::Point3<S> *)&m[2][0] = -z_dir/z_dir.SquaredNorm();
similarity.rot.FromMatrix(m);
}
template <class S>
vcg::Point3<S> Shot<S>::ConvertToCameraCoordinates(const vcg::Point3<S> & p) const{
::QMessageBox mb;
char t[200];
sprintf(t,"shot in %f %f %f",p[0],p[1],p[2]);
mb.setText(t);
mb.exec();
vcg::Point3<S> tmp = similarity.Matrix()*p;
sprintf(t,"shot out %f %f %f",tmp[0],tmp[1],tmp[2]);
mb.setText(t);
mb.exec();
return tmp;
vcg::Point3<S> cp = similarity.Matrix()*p;
// note: the camera reference system is right handed
cp[2]=-cp[2];
return cp;
}
template <class S>
@ -107,7 +151,7 @@ vcg::Point2<S> Shot<S>::Project(const vcg::Point3<S> & p) const{
template <class S>
S Shot<S>::Depth(const vcg::Point3<S> & p)const {
return (camera.Project(ConvertToCameraCoordinates(p))).
return ConvertToCameraCoordinates(p).Z();
}
}