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feat: inc/dec orbiter velocity

This commit is contained in:
Cat Flynn 2024-09-29 00:16:17 +01:00
parent be40086eae
commit 7034b1e70c
2 changed files with 54 additions and 35 deletions
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9
lib/skein/src/particlemap.cpp
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@ -119,7 +119,14 @@ void ParticleMap::setParticleLocalVelocity(const std::string& id, double time, c
newOrbit.setTrueAnomaly(keplerian[astro::trueAnomalyIndex]); newOrbit.setTrueAnomaly(keplerian[astro::trueAnomalyIndex]);
const double newMeanAnomaly = newOrbit.getMeanAnomaly(gravitationalParameter, time); const double newMeanAnomaly = newOrbit.getMeanAnomaly(gravitationalParameter, time);
const double newMeanAnomalyAtEpoch = originalMeanAnomalyAtEpoch - (newMeanAnomaly - originalMeanAnomaly); const double meanAnomalyShift = newMeanAnomaly - originalMeanAnomaly;
const double periapsisShift = newOrbit.getArgumentOfPeriapsis() - orbit.getArgumentOfPeriapsis();
//const double ascendingNodeShift = newOrbit.getLongitudeOfAscendingNode() - orbit.getLongitudeOfAscendingNode();
const double newMeanAnomalyAtEpoch = originalMeanAnomalyAtEpoch
- meanAnomalyShift
- periapsisShift;
//- ascendingNodeShift;
newOrbit.setMeanAnomalyAtEpoch(newMeanAnomalyAtEpoch); newOrbit.setMeanAnomalyAtEpoch(newMeanAnomalyAtEpoch);
setRelationship(parentId, id, newOrbit); setRelationship(parentId, id, newOrbit);

80
src/main.cpp
View File

@ -35,7 +35,8 @@
struct Input struct Input
{ {
bool pauseTime; bool pauseTime;
bool updateOrbit; bool prograde;
bool retrograde;
} input; } input;
@ -44,14 +45,16 @@ void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods
if (action == GLFW_PRESS) if (action == GLFW_PRESS)
{ {
input.pauseTime = key == GLFW_KEY_SPACE; input.pauseTime = key == GLFW_KEY_SPACE;
input.updateOrbit = key == GLFW_KEY_W; input.prograde = key == GLFW_KEY_W;
input.retrograde = key == GLFW_KEY_S;
} }
} }
void clearInput() void clearInput()
{ {
input.pauseTime = false; input.pauseTime = false;
input.updateOrbit = false; input.prograde = false;
input.retrograde = false;
} }
// now should always increase linearly with real world time, this should not be modified by input // now should always increase linearly with real world time, this should not be modified by input
@ -88,36 +91,43 @@ int main()
// set parameters of moon's orbit around earth // set parameters of moon's orbit around earth
Orbit moonOrbit; Orbit moonOrbit;
double moonOrbitSemiMajorAxis = 3.84748e8; //double moonOrbitSemiMajorAxis = 3.84748e8;
double moonOrbitSemiMajorAxis = 1;
moonOrbit.setSemiMajorAxis(moonOrbitSemiMajorAxis); // metres moonOrbit.setSemiMajorAxis(moonOrbitSemiMajorAxis); // metres
moonOrbit.setEccentricity(0.055); //moonOrbit.setEccentricity(0.055);
moonOrbit.setInclination(glm::radians(5.15)); // radians //moonOrbit.setInclination(glm::radians(5.15)); // radians
moonOrbit.setArgumentOfPeriapsis(318.15); // in the case of the moon these last two values are //moonOrbit.setArgumentOfPeriapsis(318.15); // in the case of the moon these last two values are
moonOrbit.setLongitudeOfAscendingNode(60.0); // pretty much constantly changing so use whatever //moonOrbit.setLongitudeOfAscendingNode(60.0); // pretty much constantly changing so use whatever
moonOrbit.setEccentricity(0.01);
moonOrbit.setInclination(0.0);
moonOrbit.setArgumentOfPeriapsis(0.0);
moonOrbit.setLongitudeOfAscendingNode(0.0);
moonOrbit.setTrueAnomaly(0.0); moonOrbit.setTrueAnomaly(0.0);
// set parameters of satellite orbit around moon // set parameters of satellite orbit around moon
Orbit stationOrbit; //Orbit stationOrbit;
stationOrbit.setSemiMajorAxis(5e7); //stationOrbit.setSemiMajorAxis(5e7);
stationOrbit.setEccentricity(0.6); //stationOrbit.setEccentricity(0.6);
stationOrbit.setInclination(glm::radians(89.0)); //stationOrbit.setInclination(glm::radians(89.0));
stationOrbit.setArgumentOfPeriapsis(43.2); //stationOrbit.setArgumentOfPeriapsis(43.2);
stationOrbit.setLongitudeOfAscendingNode(239.7); //stationOrbit.setLongitudeOfAscendingNode(239.7);
stationOrbit.setTrueAnomaly(0.0); //stationOrbit.setTrueAnomaly(0.0);
ParticleMap map; ParticleMap map;
map.setParticle({"earth", 5.9e24}); //map.setParticle({"earth", 5.9e24});
map.setParticle({"moon", 7.3e22}); //map.setParticle({"moon", 7.3e22});
map.setParticle({"station", 1e6}); map.setParticle({"earth", 1});
map.setParticle({"moon", .5});
//map.setParticle({"station", 1e6});
map.setRelationship("earth", "moon", moonOrbit); map.setRelationship("earth", "moon", moonOrbit);
map.setRelationship("moon", "station", stationOrbit); //map.setRelationship("moon", "station", stationOrbit);
float scale = moonOrbitSemiMajorAxis * 1.1; float scale = moonOrbitSemiMajorAxis * 1.1;
ParticleVisualizer earthVis(map, "earth", 0.1, litProgram, unlitProgram, scale); ParticleVisualizer earthVis(map, "earth", 0.1, litProgram, unlitProgram, scale);
ParticleVisualizer moonVis(map, "moon", 0.02, litProgram, unlitProgram, scale); ParticleVisualizer moonVis(map, "moon", 0.02, litProgram, unlitProgram, scale);
ParticleVisualizer stationVis(map, "station", 0.01, litProgram, unlitProgram, scale); //ParticleVisualizer stationVis(map, "station", 0.01, litProgram, unlitProgram, scale);
OrbitVisualizer moonOrbitVis(map, "moon", unlitProgram, scale); OrbitVisualizer moonOrbitVis(map, "moon", unlitProgram, scale);
OrbitVisualizer stationOrbitVis(map, "station", unlitProgram, scale); //OrbitVisualizer stationOrbitVis(map, "station", unlitProgram, scale);
// register input // register input
glfwSetKeyCallback(window, keyCallback); glfwSetKeyCallback(window, keyCallback);
@ -166,16 +176,18 @@ int main()
} }
else else
{ {
if (input.updateOrbit) //glm::dvec3 v = map.getParticleLocalVelocity("station", time);
glm::dvec3 v = map.getParticleLocalVelocity("moon", time);
if (input.prograde)
{ {
v *= 1.01;
const glm::dvec3 p = map.getParticleLocalPosition("station", time);
const glm::dvec3 v = map.getParticleLocalVelocity("station", time);
const glm::dvec3 newVelocity = v * 0.99;
map.setParticleLocalVelocity("station", time, newVelocity);
} }
else if (input.retrograde)
{
v *= 0.99;
}
//map.setParticleLocalVelocity("station", time, v);
map.setParticleLocalVelocity("moon", time, v);
} }
// rendering // rendering
@ -186,17 +198,17 @@ int main()
const Particle& earth = map.getParticle("earth"); const Particle& earth = map.getParticle("earth");
const Particle& moon = map.getParticle("moon"); const Particle& moon = map.getParticle("moon");
moonOrbit = map.getOrbit("moon"); moonOrbit = map.getOrbit("moon");
stationOrbit = map.getOrbit("station"); //stationOrbit = map.getOrbit("station");
moonOrbit.update(time, earth.getGravitationalParameter()); moonOrbit.update(time, earth.getGravitationalParameter());
stationOrbit.update(time, moon.getGravitationalParameter()); //stationOrbit.update(time, moon.getGravitationalParameter());
map.setRelationship("earth", "moon", moonOrbit); map.setRelationship("earth", "moon", moonOrbit);
map.setRelationship("moon", "station", stationOrbit); //map.setRelationship("moon", "station", stationOrbit);
earthVis.render(time); earthVis.render(time);
moonVis.render(time); moonVis.render(time);
stationVis.render(time); //stationVis.render(time);
moonOrbitVis.render(time); moonOrbitVis.render(time);
stationOrbitVis.render(time); //stationOrbitVis.render(time);
glfwSwapBuffers(window); glfwSwapBuffers(window);
} }