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

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This commit is contained in:
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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16
src/main.cpp
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@ -1,5 +1,7 @@
#include "mass_springs.hpp"
#define VERLET_UPDATE
#include <iostream>
#include <raylib.h>
#include <raymath.h>
@ -28,15 +30,11 @@ auto main(int argc, char *argv[]) -> int {
MassSpringSystem mass_springs;
mass_springs.AddMass(1.0, Vector3(-0.5, 0.5, 0.0), true);
mass_springs.AddMass(1.0, Vector3(0.5, 0.5, 0.0), false);
mass_springs.AddMass(1.0, Vector3(0.5, 0.0, 0.0), false);
mass_springs.AddSpring(0, 1, DEFAULT_SPRING_CONSTANT,
DEFAULT_DAMPENING_CONSTANT, DEFAULT_REST_LENGTH);
Mass &massA = mass_springs.masses[0];
Mass &massB = mass_springs.masses[1];
std::cout << "Position: A: (" << massA.position.x << ", " << massA.position.y
<< ", " << massA.position.z << ")" << std::endl;
std::cout << "Position: B: (" << massB.position.x << ", " << massB.position.y
<< ", " << massB.position.z << ")" << std::endl;
mass_springs.AddSpring(1, 2, DEFAULT_SPRING_CONSTANT,
DEFAULT_DAMPENING_CONSTANT, DEFAULT_REST_LENGTH);
Renderer renderer(WIDTH, HEIGHT);
@ -47,8 +45,12 @@ auto main(int argc, char *argv[]) -> int {
frametime = GetFrameTime();
mass_springs.ClearForces();
mass_springs.CalculateSpringForces();
#ifdef VERLET_UPDATE
mass_springs.VerletUpdate(frametime * SIM_SPEED);
#else
mass_springs.IntegrateVelocities(frametime * SIM_SPEED);
mass_springs.IntegratePositions(frametime * SIM_SPEED);
#endif
// std::cout << "Calculating Spring Forces: A: (" << massA.force.x << ", "
// << massA.force.y << ", " << massA.force.z << ") B: ("