MRSphere.h

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#pragma once
 
#include "MRMeshFwd.h" // To fix `attribute declaration must precede definition` on `Sphere`.
 
namespace MR
{
 
template <typename V>
struct Sphere
{
    using T = typename V::ValueType;
 
    V center;
    T radius = 0;
 
    constexpr Sphere() noexcept = default;
    constexpr Sphere( const V & c, T r ) noexcept : center( c ), radius( r ) { }
 
    // Here `V == U` doesn't seem to cause any issues in the C++ code, but we're still disabling it because it somehow gets emitted
    //   when generating the bindings, and results in duplicate functions in C#.
    template <typename U> MR_REQUIRES_IF_SUPPORTED( !std::is_same_v<V, U> )
    constexpr explicit Sphere( const Sphere<U> & l ) noexcept : center( l.center ), radius( T( l.radius ) ) { }
 
    [[nodiscard]] V project( const V & x ) const { return center + radius * ( x - center ).normalized(); }
 
    [[nodiscard]] T distance( const V & x ) const { return ( x - center ).length() - radius; }
 
    [[nodiscard]] T distanceSq( const V & x ) const { return sqr( distance( x ) ); }
 
    friend bool operator == ( const Sphere & a, const Sphere & b ) = default;
};
 
} // namespace MR