turtlebasket
/
micromissiles-unity
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix drag acceleration calculation

more-targets
Titan Yuan 2024-09-12 22:31:14 -07:00
parent d0ef6c3fc4
commit 23de73662c
1 changed files with 9 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Assets/Scripts/Missile.cs
View File

@ -68,12 +68,12 @@ public class Missile : Agent
accelerationInput -= gravityProjection; accelerationInput -= gravityProjection;
} }
Vector3 airDrag = CalculateDrag(); float airDrag = CalculateDrag();
Vector3 liftInducedDrag = CalculateLiftInducedDrag(accelerationInput); float liftInducedDrag = CalculateLiftInducedDrag(accelerationInput);
Vector3 dragAcceleration = -(airDrag + liftInducedDrag); float dragAcceleration = -(airDrag + liftInducedDrag);
// Project the drag acceleration onto the forward direction // Project the drag acceleration onto the forward direction
Vector3 dragAccelerationAlongRoll = Vector3.Dot(dragAcceleration, transform.forward) * transform.forward; Vector3 dragAccelerationAlongRoll = dragAcceleration * transform.forward;
return accelerationInput + gravity + dragAccelerationAlongRoll; return accelerationInput + gravity + dragAccelerationAlongRoll;
} }
@ -131,22 +131,21 @@ public class Missile : Agent
gravityProjectionYawCoefficient * yawAxis; gravityProjectionYawCoefficient * yawAxis;
} }
private Vector3 CalculateDrag() private float CalculateDrag()
{ {
float dragCoefficient = StaticConfig.liftDragConfig.dragCoefficient; float dragCoefficient = StaticConfig.liftDragConfig.dragCoefficient;
float crossSectionalArea = StaticConfig.bodyConfig.crossSectionalArea; float crossSectionalArea = StaticConfig.bodyConfig.crossSectionalArea;
float mass = StaticConfig.bodyConfig.mass; float mass = StaticConfig.bodyConfig.mass;
float dynamicPressure = (float)GetDynamicPressure(); float dynamicPressure = (float)GetDynamicPressure();
float dragForce = dragCoefficient * dynamicPressure * crossSectionalArea; float dragForce = dragCoefficient * dynamicPressure * crossSectionalArea;
return dragForce / mass * Vector3.one; return dragForce / mass;
} }
private Vector3 CalculateLiftInducedDrag(Vector3 accelerationInput) private float CalculateLiftInducedDrag(Vector3 accelerationInput)
{ {
Vector3 principalAxes = transform.forward; float liftAcceleration = Vector3.Dot(accelerationInput, transform.forward);
float liftAcceleration = Vector3.Dot(accelerationInput, principalAxes);
float liftDragRatio = StaticConfig.liftDragConfig.liftDragRatio; float liftDragRatio = StaticConfig.liftDragConfig.liftDragRatio;
return Mathf.Abs(liftAcceleration / liftDragRatio) * Vector3.one; return Mathf.Abs(liftAcceleration / liftDragRatio);
} }