christoph/cpp-masssprings
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implement verlet integration - much more stable

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Christoph Urlacher
2026-02-16 00:37:37 +01:00
parent d1b115a7c3
commit d6ce1a94f5
4 changed files with 50 additions and 12 deletions
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2
include/config.hpp
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@ -10,7 +10,7 @@ constexpr float VERTEX_SIZE = 5.0;
constexpr Color VERTEX_COLOR = {27, 188, 104, 255};
constexpr Color EDGE_COLOR = {20, 133, 38, 255};
constexpr float SIM_SPEED = 2.0;
constexpr float SIM_SPEED = 4.0;
constexpr float CAMERA_DISTANCE = 2.2;
constexpr float DEFAULT_SPRING_CONSTANT = 1.5;

18
include/mass_springs.hpp
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@ -3,27 +3,34 @@
#include <cstddef>
#include <raylib.h>
#include <raymath.h>
#include <vector>
class Mass {
public:
float mass;
Vector3 position;
Vector3 previous_position; // for verlet integration
Vector3 velocity;
Vector3 force;
bool fixed;
public:
Mass(float mass, Vector3 position, bool fixed)
: mass(mass), position(position), fixed(fixed) {}
: mass(mass), position(position), previous_position(position),
velocity(Vector3Zero()), force(Vector3Zero()), fixed(fixed) {}
Mass(const Mass &copy)
: mass(copy.mass), position(copy.position), fixed(copy.fixed) {};
: mass(copy.mass), position(copy.position),
previous_position(copy.previous_position), velocity(copy.velocity),
force(copy.force), fixed(copy.fixed) {};
Mass &operator=(const Mass &copy) = delete;
Mass(Mass &&move)
: mass(move.mass), position(move.position), fixed(move.fixed) {};
: mass(move.mass), position(move.position),
previous_position(move.previous_position), velocity(move.velocity),
force(move.force), fixed(move.fixed) {};
Mass &operator=(Mass &&move) = delete;
@ -35,6 +42,8 @@ public:
auto CalculateVelocity(const float delta_time) -> void;
auto CalculatePosition(const float delta_time) -> void;
auto VerletUpdate(const float delta_time) -> void;
};
using MassList = std::vector<Mass>;
@ -43,7 +52,6 @@ class Spring {
public:
Mass &massA;
Mass &massB;
int indexB;
float spring_constant;
float dampening_constant;
float rest_length;
@ -110,6 +118,8 @@ public:
auto IntegrateVelocities(const float delta_time) -> void;
auto IntegratePositions(const float delta_time) -> void;
auto VerletUpdate(const float delta_time) -> void;
};
#endif