MRAffineXf3.h

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#pragma once
 
#include "MRMatrix3.h"
#include "MRAffineXf.h"
 
namespace MR
{
 
template<typename T>
AffineXf3<T> lookAt( const Vector3<T>& center, const Vector3<T>& eye, const Vector3<T>& up )
{
    const auto f = (center - eye).normalized();
    const auto s = cross( f, up ).normalized();
    const auto u = cross( s, f );
 
    return AffineXf3f{ 
        Matrix3f{ s, u, -f },
        Vector3f{ -dot( s, eye ), -dot( u, eye ), dot( f, eye ) }
    };
}
 
} // namespace MR