50void trackball(
double q[4],
double p1x,
double p1y,
double p2x,
double p2y );
60void add_quats(
double *q1,
double *q2,
double *dest );
73void axis_to_quat(
double a[3],
double phi,
double q[4] );
void add_quats(double *q1, double *q2, double *dest)
void build_rotmatrix(float m[4][4], double q[4])
void trackball(double q[4], double p1x, double p1y, double p2x, double p2y)
void axis_to_quat(double a[3], double phi, double q[4])