/*public void OrbitTargetUpDownNatural( double theta_degrees )
* {
* float fn = Forward.Val % NaturalUp.Val;
* if( ( theta_degrees < 0.0 && fn >= 0.95f ) || ( theta_degrees > 0.0 && fn <= -0.95f ) ) return;
*
* double theta = theta_degrees * Math.PI / 180.0;
* Vec3f posreltar = Position.Val - Target.Val;
* Vec3f right = Forward.Val ^ NaturalUp.Val;
* float dist = (Target.Val - Position.Val).Length;
*
* Properties.DeferPropertyChanged = true;
* bIgnoreChanges = true;
* Position.Set( Target.Val + Vec3f.Normalize( VecExtensions.RotateVectorAroundAxis( posreltar, right, (float) theta ) ) * dist );
* Up.Set( VecExtensions.RotateVectorAroundAxis( Up.Val, right, (float) theta ) );
* bIgnoreChanges = false;
* Target.Set( Target.Val );
* Properties.DeferPropertyChanged = false;
* }*/
public void OrbitTargetUpDown(double theta_degrees, bool clampflips)
{
double theta = theta_degrees * Math.PI / 180.0;
Quatf newrot = qrot * Quatf.AxisAngleToQuatf(GetRight(), (float)theta);
if (clampflips)
{
// prevent camera from flipping over!
Vec3f newup = Vec3f.Normalize(newrot.Rotate(Vec3f.Y));
float dot = FMath.PI / 2.0f - Vec3f.AngleBetween(newup, NaturalUp.Val);
if (dot < 0)
{
Vec3f newforward = Vec3f.Normalize(newrot.Rotate(-Vec3f.Z));
Vec3f newright = newforward ^ newup;
float sign = -Math.Sign(newforward % NaturalUp.Val);
newrot = newrot * Quatf.RotAxisAngleToQuatf(newright, dot * sign);
}
}
Set(Target.Val, newrot, dist);
}