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45 lines
1.1 KiB
45 lines
1.1 KiB
#ifndef PHYSICS_H |
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#define PHYSICS_H |
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// 3D Vector |
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struct Vec3 { |
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double x, y, z; |
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}; |
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// 3x3 Matrix (row-major) |
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struct Mat3 { |
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double m00, m01, m02; |
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double m10, m11, m12; |
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double m20, m21, m22; |
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}; |
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// Gravitational constant (m^3 kg^-1 s^-2) |
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const double G = 6.67430e-11; |
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// Vector math functions |
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Vec3 vec3_add(Vec3 a, Vec3 b); |
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Vec3 vec3_sub(Vec3 a, Vec3 b); |
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Vec3 vec3_cross(Vec3 a, Vec3 b); |
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Vec3 vec3_scale(Vec3 v, double s); |
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double vec3_magnitude(Vec3 v); |
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double vec3_distance(Vec3 a, Vec3 b); |
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Vec3 vec3_normalize(Vec3 v); |
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double vec3_dot(Vec3 a, Vec3 b); |
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// Matrix functions |
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Mat3 mat3_identity(); |
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Mat3 mat3_multiply(Mat3 a, Mat3 b); |
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Vec3 mat3_multiply_vec3(Mat3 m, Vec3 v); |
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Mat3 mat3_rotation_x(double angle); |
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Mat3 mat3_rotation_z(double angle); |
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Mat3 mat3_rotation_orbital(double omega, double i, double Omega); |
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// Physics functions |
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Vec3 calculate_acceleration(Vec3 force, double mass); |
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// Physics integration functions |
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void rk4_step(Vec3* position, Vec3* velocity, double dt, |
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double body_mass, double parent_mass); |
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Vec3 evaluate_acceleration(Vec3 relative_pos, double body_mass, double parent_mass); |
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#endif
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