37 lines
1 KiB
C++
37 lines
1 KiB
C++
/**
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* Defines an ellispoid, which is a basic interpretaion of the ball when it is
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* bouncing.
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**/
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#include <cstddef>
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#include <cmath>
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#include "Implicit.hpp"
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#include "common_structures.hpp"
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const double PI = 3.141592653589793;
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class Spheroid : public ImplicitSurface {
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public:
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Spheroid(Point& _center, size_t _p, size_t _q);
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void update_center_pos(Point& _center);
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void update_radius();
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void set_stiffness(size_t _stiffness);
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double operator() (double _x, double _y, double _z) {
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return (pow(_x - center.x, 2) / pow(q, 2)
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+ pow(_y - center.y, 2) / pow(q, 2)
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+ pow(_z - center.z, 2) / pow(p, 2) -1);
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}
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private:
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/**
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* p corresponds to the half-height of the ball,
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* q to the radius of the ball,
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* V is the volume. Extremely useful to have a constant volume in the
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* ball
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**/
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size_t stiffness;
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double p, q;
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double V;
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Point& center;
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void _compute_volume();
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};
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