christoph/cpp-masssprings
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rebuild the repulsion force grid every n frames

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This commit is contained in:
Christoph Urlacher
2026-02-18 23:12:02 +01:00
parent 1dad350f7d
commit 55ff0f3490
5 changed files with 47 additions and 17 deletions
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5
include/config.hpp
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@ -27,12 +27,13 @@ constexpr float ROT_SPEED = 1.0;
// Physics Engine
constexpr float MASS = 1.0;
constexpr float SPRING_CONSTANT = 1.0;
constexpr float SPRING_CONSTANT = 1.5;
constexpr float DAMPENING_CONSTANT = 0.8;
constexpr float REST_LENGTH = 1.0;
constexpr float REPULSION_FORCE = 0.1;
constexpr float REPULSION_RANGE = 3.0 * REST_LENGTH;
constexpr float VERLET_DAMPENING = 0.02; // [0, 1]
constexpr int REPULSION_GRID_REFRESH = 5; // Frames between grid rebuilds
constexpr float VERLET_DAMPENING = 0.01; // [0, 1]
// Graph Drawing
constexpr float VERTEX_SIZE = 0.1;

14
include/mass_springs.hpp
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@ -5,6 +5,7 @@
#include <raymath.h>
#include <string>
#include <unordered_map>
#include <vector>
class Mass {
public:
@ -83,12 +84,20 @@ public:
};
class MassSpringSystem {
private:
std::vector<Mass *> mass_vec;
std::vector<int> indices;
std::vector<int64_t> cell_ids;
int last_build;
int last_masses_count;
int last_springs_count;
public:
std::unordered_map<std::string, Mass> masses;
std::unordered_map<std::string, Spring> springs;
public:
MassSpringSystem() {};
MassSpringSystem() : last_build(1000) {};
MassSpringSystem(const MassSpringSystem &copy) = delete;
MassSpringSystem &operator=(const MassSpringSystem &copy) = delete;
@ -97,6 +106,9 @@ public:
~MassSpringSystem() {};
private:
auto BuildGrid() -> void;
public:
auto AddMass(float mass, Vector3 position, bool fixed,
const std::string &state) -> void;