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finished refactoring to have a distinct part for the balloon and the case ; when cutting the rope the balloon becomes an independent vessel ; the balloon can be destroyed by a collision or over heating

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This commit is contained in:
Youen Toupin 2016-03-28 02:13:28 +02:00
parent 057d997626
commit bdda3ed81f
12 changed files with 204 additions and 93 deletions
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23
Parts/HeliumBalloon/heliumBalloon.cfg
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@ -4,24 +4,17 @@ PART
module = Part
author = Youen
mesh = model.mu
scale = 0.1
rescaleFactor = 1
node_stack_bottom = 0.0, -0.020649, 0.0, 0.0, -1.0, 0.0, 1
node_attach = 0.0, -0.020649, 0.0, 0.0, -1.0, 0.0
sound_parachute_open = activate
TechRequired = advLanding
entryCost = 3500
cost = 5000
category = Utility
TechRequired = Unresearcheable
entryCost = 0
cost = 0
category = none
subcategory = 0
title = Balloon
description = A big balloon that can be inflated with helium (sold separately).
attachRules = 1,0,0,1,0
mass = 0.2
mass = 0.050
dragModelType = default
angularDrag = 3
angularDrag = 10
crashTolerance = 12
maxTemp = 2000 // = 3100
maxTemp = 1000
breakingForce = 100
breakingTorque = 50
bodyLiftMultiplier = 0
@ -29,6 +22,6 @@ PART
bulkheadProfiles = size1, srf
MODULE
{
name = ModuleBalloonCase
name = ModuleBalloon
}
}

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34
Parts/HeliumBalloonCase/heliumBalloonCase.cfg Normal file
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@ -0,0 +1,34 @@
PART
{
name = heliumBalloonCase
module = Part
author = Youen
mesh = model.mu
scale = 0.1
rescaleFactor = 1
node_stack_bottom = 0.0, -0.020649, 0.0, 0.0, -1.0, 0.0, 1
node_attach = 0.0, -0.020649, 0.0, 0.0, -1.0, 0.0
sound_parachute_open = activate
TechRequired = advLanding
entryCost = 3500
cost = 5000
category = Utility
subcategory = 0
title = Balloon
description = A big balloon that can be inflated with helium (sold separately).
attachRules = 1,0,0,1,0
mass = 0.2
dragModelType = default
angularDrag = 3
crashTolerance = 12
maxTemp = 2000 // = 3100
breakingForce = 100
breakingTorque = 50
bodyLiftMultiplier = 0
stageOffset = -1
bulkheadProfiles = size1, srf
MODULE
{
name = ModuleBalloonCase
}
}

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93
Plugin/ModuleBalloon.cs
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@ -8,14 +8,29 @@ namespace Aerostats
{
public class ModuleBalloon : PartModule
{
public float MaxBalloonVolume { get; private set; }
public float GasDensity { get; private set; }
public float BalloonDragCoeff { get; private set; }
public float BalloonEmptyMass { get; private set; }
/// <summary>
/// Volume at which the balloon is full. Trying to add more gas, or simply having already stored gas expand due to lower exterior pressure or increased temperature, will cause gas to be vented through the security valve.
/// Air density at sea level is about 1.2kg/m^3, which means a 1000m^3 balloon will be able to lift about 1 ton at sea level (after substracting the balloon gas weight)
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float MaxVolume = 15000;
/// <summary>
/// Drag coefficient of the balloon
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float DragCoeff = 0.3f;
public float GasMolarMass { get; private set; }
/// <summary>
/// Mass of the empty balloon, in kg
/// </summary>
public float EmptyMass { get; private set; }
public float LiftingGasQuantity { get; private set; }
public float CurrentVolume { get; private set; }
public float BalloonLift { get; private set; }
public float Lift { get; private set; }
public bool IsVenting { get; private set; }
/// <summary>
@ -25,22 +40,47 @@ namespace Aerostats
public float Radius { get; private set; }
public ModuleBalloonCase AttachedCase { get; private set; }
/// <summary>
/// Must be called right after creating a balloon
/// </summary>
public void Initialize(float emptyMass, Vector3 initialVelocity, float maxVolume, float gasDensity, float dragCoeff)
public void Initialize(ModuleBalloonCase attachedCase, Vector3 initialVelocity, float gasDensity, float initialGasQuantity)
{
MaxBalloonVolume = maxVolume;
GasDensity = gasDensity;
BalloonDragCoeff = dragCoeff;
BalloonEmptyMass = emptyMass;
AttachedCase = attachedCase;
GasMolarMass = gasDensity / GasUtilities.StpVolumeToMoles;
EmptyMass = part.mass * 1000.0f;
// replace mesh and collider by a sphere (hack until proper assets are created)
var sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
gameObject.GetComponentInChildren<MeshFilter>().mesh = sphere.GetComponent<MeshFilter>().mesh;
Destroy(gameObject.collider);
var collider = gameObject.AddComponent<SphereCollider>();
collider.radius = 0.67f; // don't ask me, I don't know why
Destroy(sphere);
gameObject.AddComponent<Rigidbody>();
rigidbody.mass = BalloonEmptyMass;
rigidbody.mass = EmptyMass * 0.001f;
rigidbody.velocity = initialVelocity; // start with the same velocity or everything explodes when deploying from a moving vessel
rigidbody.angularDrag = 10.0f;
rigidbody.position = transform.position;
InjectGas(0.0001f);
InjectGas(initialGasQuantity);
part.OnJustAboutToBeDestroyed += OnPartDestroyed;
}
public void OnDetached()
{
AttachedCase = null;
}
private void OnPartDestroyed()
{
if(AttachedCase != null)
AttachedCase.Cut();
part.OnJustAboutToBeDestroyed -= OnPartDestroyed;
}
/// <summary>
@ -56,7 +96,7 @@ namespace Aerostats
if (LiftingGasQuantity > currentMaxQuantity)
{
IsVenting = true;
Util.PostSingleScreenMessage("security valve", "Some gas has been vented by the balloon security valve");
Util.PostDebugSingleScreenMessage("security valve", "Some gas has been vented by the balloon security valve");
LiftingGasQuantity = currentMaxQuantity;
}
else
@ -73,21 +113,20 @@ namespace Aerostats
float currentGasMoles = GasUtilities.StpVolumeToMoles * LiftingGasQuantity;
CurrentVolume = currentGasMoles * GasUtilities.R * balloonInternalTemperature / externalPressure;
Inflation = CurrentVolume / MaxBalloonVolume;
Inflation = CurrentVolume / MaxVolume;
Util.PostSingleScreenMessage("inflation", "Inflation = " + (Inflation * 100.0f).ToString("0.00") + "%");
Util.PostDebugSingleScreenMessage("inflation", "Inflation = " + (Inflation * 100.0f).ToString("0.00") + "%");
float airDensity = (float)FlightGlobals.getAtmDensity(externalPressure / 1000.0f, externalTemperature, body);
float currentGasDensity = GasDensity * balloonInternalTemperature / GasUtilities.ZeroCelsius / externalPressure * GasUtilities.StandardPressure;
BalloonLift = CurrentVolume * airDensity;
float balloonGasMass = currentGasDensity * CurrentVolume;
Util.PostSingleScreenMessage("lift", "Air density = " + airDensity + "kg/m^3, Lift = " + (BalloonLift - balloonGasMass) + "kg");
Lift = CurrentVolume * airDensity;
float balloonGasMass = GasMolarMass * currentGasMoles;
Util.PostDebugSingleScreenMessage("lift", "Air density = " + airDensity + "kg/m^3, Lift = " + (Lift - balloonGasMass) + "kg");
// V = 4/3*pi*r^3
Radius = Mathf.Pow(CurrentVolume * 0.75f / Mathf.PI, 0.333f);
float scale = Radius * 2.0f + 0.1f;
float scale = Radius + 0.1f;
transform.localScale = new Vector3(scale, scale, scale);
rigidbody.mass = (BalloonEmptyMass + balloonGasMass) * 0.001f;
rigidbody.mass = (EmptyMass + balloonGasMass) * 0.001f;
return LiftingGasQuantity;
}
@ -103,9 +142,9 @@ namespace Aerostats
float externalTemperature = (float)FlightGlobals.getExternalTemperature(worldPos, body);
float balloonInternalTemperature = externalTemperature;
float externalPressure = Math.Max((float)FlightGlobals.getStaticPressure(worldPos, body) * 1000.0f, 0.00001f);
Util.PostSingleScreenMessage("external atmo", "Temperature = " + externalTemperature + "K, Pressure=" + externalPressure + "Pa");
Util.PostDebugSingleScreenMessage("external atmo", "Temperature = " + externalTemperature + "K, Pressure=" + externalPressure + "Pa");
float currentMaxQuantity = MaxBalloonVolume / GasUtilities.R / balloonInternalTemperature * externalPressure / GasUtilities.StpVolumeToMoles;
float currentMaxQuantity = MaxVolume / GasUtilities.R / balloonInternalTemperature * externalPressure / GasUtilities.StpVolumeToMoles;
return currentMaxQuantity;
}
@ -115,6 +154,8 @@ namespace Aerostats
Vector3d worldPos = vessel.GetWorldPos3D();
CelestialBody body = vessel.mainBody;
rigidbody.WakeUp();
InjectGas(0); // update security valve venting
var gravityAccel = FlightGlobals.getGeeForceAtPosition(worldPos);
@ -125,14 +166,14 @@ namespace Aerostats
float externalPressure = Math.Max((float)FlightGlobals.getStaticPressure(worldPos, body) * 1000.0f, 0.00001f);
float airDensity = (float)FlightGlobals.getAtmDensity(externalPressure / 1000.0f, externalTemperature, body);
rigidbody.AddForce(-gravityAccel * BalloonLift / 1000.0f, ForceMode.Force);
rigidbody.AddForce(-gravityAccel * Lift / 1000.0f, ForceMode.Force);
// balloon drag
var airVelocity = rigidbody.velocity + Krakensbane.GetFrameVelocity() /*- vessel.mainBody.getRFrmVel(vessel.GetWorldPos3D())*/;
float sqVel = (float)airVelocity.magnitude;
sqVel *= sqVel;
float dragForce = 0.5f * airDensity * sqVel * BalloonDragCoeff * (Mathf.PI * Radius * Radius);
Util.PostSingleScreenMessage("balloon drag", "Drag = " + dragForce + "N");
float dragForce = 0.5f * airDensity * sqVel * DragCoeff * (Mathf.PI * Radius * Radius);
Util.PostDebugSingleScreenMessage("balloon drag", "Drag = " + dragForce + "N");
rigidbody.AddForce(-airVelocity.normalized * dragForce / 1000.0f, ForceMode.Force);
}
}

139
Plugin/ModuleBalloonCase.cs
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@ -20,13 +20,6 @@ namespace Aerostats
[KSPField(isPersistant = false, guiActive = false)]
public float MaxGasVentRate = 500;
/// <summary>
/// Volume at which the balloon is full. Trying to add more gas, or simply having already stored gas expand due to lower exterior pressure or increased temperature, will cause gas to be vented through the security valve.
/// Air density at sea level is about 1.2kg/m^3, which means a 1000m^3 balloon will be able to lift about 1 ton at sea level (after substracting the balloon gas weight)
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float MaxBalloonVolume = 15000;
/// <summary>
/// Weight, in kilograms, of 1m^3 of gas at 100kPa and 0°C
/// Helium is 179g/m^3
@ -43,24 +36,12 @@ namespace Aerostats
[UI_FloatRange(minValue = 0, maxValue = 20000.0f, stepIncrement = 100.0f)]
public float LiftingGasTargetQuantity = 100.0f;
/// <summary>
/// Mass of the empty balloon, in kg
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float BalloonEmptyMass = 50.0f;
/// <summary>
/// Minimum amount of gas that will be used to inflate the balloon at the beginning. The balloon can not be deflated below this amount.
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float MinimumFillQuantity = 10.0f;
/// <summary>
/// Drag coefficient of the balloon
/// </summary>
[KSPField(isPersistant = false, guiActive = false)]
public float BalloonDragCoeff = 0.3f;
/// <summary>
/// Length of spring that can not be extended (no force applied under this length)
/// </summary>
@ -80,6 +61,8 @@ namespace Aerostats
private bool Destroyed;
private Vector3 EstimatedNextFramePosition;
/// <summary>
/// Gas quantity currently inside the balloon
/// </summary>
@ -92,26 +75,60 @@ namespace Aerostats
private ModuleBalloon Balloon;
private LineRenderer Spring;
private Vector3 EstimatedNextFramePosition;
public static void RemoveAttachJointBetween(Part part1, Part part2)
{
if (part1.attachJoint && ((part1.attachJoint.Host == part1 && part1.attachJoint.Target == part2) || (part1.attachJoint.Host == part2 && part1.attachJoint.Target == part1)))
{
part1.attachJoint.DestroyJoint();
}
if (part2.attachJoint && ((part2.attachJoint.Host == part2 && part2.attachJoint.Target == part1) || (part2.attachJoint.Host == part1 && part2.attachJoint.Target == part2)))
{
part2.attachJoint.DestroyJoint();
}
}
[KSPEvent(guiActive = true, active = true, externalToEVAOnly = false, guiActiveUnfocused = true, guiName = "Deploy balloon", unfocusedRange = 5)]
public void Deploy()
{
[KSPEvent(guiActive = true, active = true, externalToEVAOnly = false, guiActiveUnfocused = true, guiName = "Deploy balloon", unfocusedRange = 5)]
public void Deploy()
{
if (Destroyed || Deployed)
return;
Deployed = true;
UnityEngine.Debug.Log("Aerostats: staged");
Util.PostScreenMessage("staged");
Util.PostDebugScreenMessage("staged");
var balloonObject = GameObject.CreatePrimitive(PrimitiveType.Sphere);
/*var balloonObject = GameObject.CreatePrimitive(PrimitiveType.Sphere);
balloonObject.SetActive(false);
balloonObject.transform.position = part.Rigidbody.position + part.Rigidbody.transform.up;
Balloon = balloonObject.AddComponent<ModuleBalloon>();
Balloon.part = part; // TODO: remove this hack and properly instantiate a new vessel?
Balloon.Initialize(BalloonEmptyMass, part.rigidbody.velocity, MaxBalloonVolume, GasDensity, BalloonDragCoeff);
var balloonPart = balloonObject.AddComponent<Part>();
balloonPart.children = new List<Part>();
balloonPart.partTransform = balloonObject.transform;
balloonPart.name = "heliumBalloon";
new GameObject("model").transform.parent = balloonPart.partTransform;
balloonPart.SetHierarchyRoot(balloonPart);
balloonPart.vessel = vessel;
balloonPart.setParent(part);*/
LiftingGasQuantity = Balloon.InjectGas(part.RequestResource("Helium", MinimumFillQuantity));
AvailablePart avPart = PartLoader.Instance.parts.Single(p => p.name == "heliumBalloon");
var balloonPart = (Part)UnityEngine.Object.Instantiate(avPart.partPrefab);
var balloonObject = balloonPart.gameObject;
balloonObject.transform.position = part.Rigidbody.position + part.Rigidbody.transform.up * 3.0f;
//balloonObject.transform.rotation = part.Rigidbody.rotation;
balloonPart.SetHierarchyRoot(balloonPart);
balloonPart.vessel = vessel;
balloonPart.setParent(part);
Balloon = balloonObject.GetComponent<ModuleBalloon>();
Balloon.part = balloonPart;
float initialGasQuantity = Mathf.Min(0.1f, part.RequestResource("Helium", MinimumFillQuantity));
balloonObject.SetActive(true);
GameEvents.onVesselWasModified.Fire(vessel);
Balloon.Initialize(this, part.rigidbody.velocity, GasDensity, initialGasQuantity);
LiftingGasQuantity = Balloon.LiftingGasQuantity;
Spring = part.gameObject.AddComponent<LineRenderer>();
Spring.useWorldSpace = true;
@ -122,27 +139,33 @@ namespace Aerostats
part.OnJustAboutToBeDestroyed += OnPartDestroyed;
EstimatedNextFramePosition = part.Rigidbody.position;
EstimatedNextFramePosition = part.Rigidbody.position;
}
[KSPEvent(guiActive = true, active = true, externalToEVAOnly = false, guiActiveUnfocused = true, guiName = "Cut rope", unfocusedRange = 5)]
public void Cut()
{
if (Destroyed || !Deployed)
[KSPEvent(guiActive = true, active = true, externalToEVAOnly = false, guiActiveUnfocused = true, guiName = "Cut rope", unfocusedRange = 5)]
public void Cut()
{
if (Destroyed || !Deployed)
return;
Balloon = null;
if (Balloon != null)
{
Balloon.OnDetached();
Balloon.part.decouple(); // after that, the balloon becomes an independent vessel
Balloon.part.vessel.vesselName = vessel.vesselName + " balloon";
Balloon = null;
}
Destroy(Spring);
Spring = null;
part.OnJustAboutToBeDestroyed -= OnPartDestroyed;
Destroyed = true;
Destroyed = true;
}
public override void OnStart(PartModule.StartState state)
{
if (!HighLogic.LoadedSceneIsEditor && !HighLogic.LoadedSceneIsFlight) { return; }
Util.PostScreenMessage("Aerostat loaded");
Util.PostDebugScreenMessage("Aerostat loaded");
part.stagingIcon = "PARACHUTES";
}
@ -151,6 +174,19 @@ namespace Aerostats
Cut();
}
private void CheckKrakensbane()
{
// detect Krakensbane teleportation, and fix up the balloon position (otherwise it results in instant ship disintegration due to extreme forces on the spring)
if ((part.Rigidbody.position - EstimatedNextFramePosition).magnitude > 1000.0f)
{
Util.PostDebugScreenMessage("Krakensbane teleportation detected! (dist=" + (part.Rigidbody.position - EstimatedNextFramePosition).magnitude + ")");
var offset = part.rigidbody.position - EstimatedNextFramePosition;
Balloon.rigidbody.position += offset;
Balloon.transform.position = Balloon.rigidbody.position;
}
EstimatedNextFramePosition = part.rigidbody.position + part.rigidbody.velocity * Time.fixedDeltaTime;
}
private void FixedUpdate()
{
if (Destroyed)
@ -167,15 +203,10 @@ namespace Aerostats
if (Deployed)
{
// detect Krakensbane teleportation, and fix up the balloon position (otherwise it results in instant ship disintegration due to extreme forces on the spring)
if ((part.Rigidbody.position - EstimatedNextFramePosition).magnitude > 1000.0f)
{
Util.PostScreenMessage("Krakensbane teleportation detected! (dist=" + (part.Rigidbody.position - EstimatedNextFramePosition).magnitude+")");
var offset = part.rigidbody.position - EstimatedNextFramePosition;
Balloon.rigidbody.position += offset;
Balloon.transform.position = Balloon.rigidbody.position;
}
EstimatedNextFramePosition = part.rigidbody.position + part.rigidbody.velocity * Time.fixedDeltaTime;
// makes sure the balloon can move freely relatively to the vessel (apparently, KSP creates a joint when attaching a part)
RemoveAttachJointBetween(Balloon.part, part);
CheckKrakensbane();
float currentMaxQuantity = Balloon.GetCurrentMaxQuantity();
@ -209,7 +240,7 @@ namespace Aerostats
Status = "full (venting)";
}
VolumeStatus = Mathf.Round(Balloon.CurrentVolume) + " / " + Mathf.Round(MaxBalloonVolume);
VolumeStatus = Mathf.Round(Balloon.CurrentVolume) + " / " + Mathf.Round(Balloon.MaxVolume);
// spring between balloon and base
float restLength = SpringRestLength + Balloon.Radius;
@ -225,7 +256,7 @@ namespace Aerostats
part.rigidbody.AddForce(springForce, ForceMode.Force);
Balloon.rigidbody.AddForceAtPosition(-springForce, balloonAttachPoint, ForceMode.Force);
}
Util.PostSingleScreenMessage("spring force", "Spring force = " + springForceMag + "N");
Util.PostDebugSingleScreenMessage("spring force", "Spring force = " + springForceMag + "N");
}
else
{
@ -241,11 +272,23 @@ namespace Aerostats
if (Deployed)
{
CheckKrakensbane();
var balloonAttachPoint = Balloon.rigidbody.position - Balloon.transform.up.normalized * Balloon.Radius;
Spring.SetPosition(0, part.transform.position);
Spring.SetPosition(1, balloonAttachPoint);
}
}
private void Update()
{
if (Destroyed)
return;
if (Deployed)
{
CheckKrakensbane();
}
}
}
}

4
Plugin/Util.cs
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@ -13,7 +13,7 @@ namespace Aerostats
{
private static Dictionary<string, ScreenMessage> messages = new Dictionary<string, ScreenMessage>();
public static void PostSingleScreenMessage(string id, string message)
public static void PostDebugSingleScreenMessage(string id, string message)
{
#if ENABLE_ONSCREEN_DEBUG
if (messages.ContainsKey(id))
@ -22,7 +22,7 @@ namespace Aerostats
#endif
}
public static void PostScreenMessage(string message)
public static void PostDebugScreenMessage(string message)
{
#if ENABLE_ONSCREEN_DEBUG
ScreenMessages.PostScreenMessage(message);

4
todo.txt
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@ -1,4 +1,4 @@
save/load balloon state
test in orbit
button to deploy
button to cut the rope
test reentry (before and after deploying the balloon)
test with RSS / RO