BulletSim: vehicle tweeking.
Add AddTorque() method to BSPrim. Remove some manual motor actions in computing angular force (will eventually be replaced with motor class). Remove some experimental changes.integration
Robert Adams
parent
52be581f71
commit
28e2cd3fa2
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@ -511,21 +511,6 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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// Do any updating needed for a vehicle
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public void Refresh()
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{
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/*
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* Doesnt work unless BSDynamics senses and corrects for all collisions
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if (IsActive)
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BulletSimAPI.AddToCollisionFlags2(Prim.BSBody.ptr, CollisionFlags.CF_KINEMATIC_OBJECT);
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else
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BulletSimAPI.RemoveFromCollisionFlags2(Prim.BSBody.ptr, CollisionFlags.CF_KINEMATIC_OBJECT);
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*/
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/*
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* Doesn't work because with zero inertia, Bullet will not apply any forces to the object.
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if (IsActive)
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{
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BulletSimAPI.SetMassProps2(Prim.BSBody.ptr, Prim.MassRaw, Vector3.Zero);
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BulletSimAPI.UpdateInertiaTensor2(Prim.BSBody.ptr);
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}
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*/
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if (IsActive)
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{
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// Friction effects are handled by this vehicle code
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@ -539,29 +524,21 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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{
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if (!IsActive) return;
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m_lastAngularVelocity = Prim.ForceRotationalVelocity; // DEBUG: account for what Bullet did last time
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// DEBUG
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// Because Bullet does apply forces to the vehicle, our last computed
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// linear and angular velocities are not what is happening now.
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// Vector3 externalAngularVelocity = Prim.ForceRotationalVelocity - m_lastAngularVelocity;
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// m_lastAngularVelocity += (externalAngularVelocity * 0.5f) * pTimestep;
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// m_lastAngularVelocity = Prim.ForceRotationalVelocity; // DEBUG: account for what Bullet did last time
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// m_lastLinearVelocityVector = Prim.ForceVelocity * Quaternion.Inverse(Prim.ForceOrientation); // DEBUG:
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// END DEBUG
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MoveLinear(pTimestep);
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MoveAngular(pTimestep);
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LimitRotation(pTimestep);
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/* Experimental
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// Wonder if Bullet could handle collision penetration while this applies the forces.
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// Apply the computed forces on the vehicle
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Prim.ForcePosition += Prim.ForceVelocity * Prim.MassRaw * pTimestep;
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if (Prim.ForceRotationalVelocity != Vector3.Zero)
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{
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Quaternion newOrientation = Prim.ForceOrientation;
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newOrientation.Normalize();
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Quaternion appliedRotation = new Quaternion((Prim.ForceRotationalVelocity * pTimestep), 0f);
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newOrientation += (appliedRotation * newOrientation) * 0.5f;
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newOrientation.Normalize();
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Prim.ForceOrientation = newOrientation;
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}
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*/
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// DEBUG: Trying to figure out why Bullet goes crazy when the root prim is moved.
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BulletSimAPI.SetInterpolationVelocity2(Prim.BSBody.ptr, m_newVelocity, m_lastAngularVelocity); // DEBUG DEBUG DEBUG
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// BulletSimAPI.SetInterpolationVelocity2(Prim.BSBody.ptr, m_newVelocity, m_lastAngularVelocity); // DEBUG DEBUG DEBUG
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// remember the position so next step we can limit absolute movement effects
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m_lastPositionVector = Prim.ForcePosition;
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@ -583,7 +560,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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Vector3 vehicleVelocity = Prim.ForceVelocity * Quaternion.Inverse(Prim.ForceOrientation); // DEBUG
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// add drive to body
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Vector3 addAmount = (m_linearMotorDirection - m_lastLinearVelocityVector)/(m_linearMotorTimescale / pTimestep);
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Vector3 addAmount = (m_linearMotorDirection - m_lastLinearVelocityVector)/(m_linearMotorTimescale) * pTimestep;
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// lastLinearVelocityVector is the current body velocity vector
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m_lastLinearVelocityVector += addAmount;
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@ -593,11 +570,12 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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Vector3 frictionFactor = (Vector3.One / m_linearFrictionTimescale) * pTimestep;
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m_lastLinearVelocityVector *= (Vector3.One - frictionFactor);
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VDetailLog("{0},MoveLinear,nonZero,origdir={1},origvel={2},vehVel={3},add={4},decay={5},lmDir={6},lmVel={7}",
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Prim.LocalID, origDir, origVel, vehicleVelocity, addAmount, decayFactor, m_linearMotorDirection, m_lastLinearVelocityVector);
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// convert requested object velocity to object relative vector
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// Rotate new object velocity from vehicle relative to world coordinates
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m_newVelocity = m_lastLinearVelocityVector * Prim.ForceOrientation;
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VDetailLog("{0},MoveLinear,nonZero,origdir={1},origvel={2},vehVel={3},add={4},decay={5},frict={6},lmDir={7},lmVel={8},newVel={9}",
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Prim.LocalID, origDir, origVel, vehicleVelocity, addAmount, decayFactor, frictionFactor,
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m_linearMotorDirection, m_lastLinearVelocityVector, m_newVelocity);
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}
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else
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{
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@ -609,18 +587,15 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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VDetailLog("{0},MoveLinear,zeroed", Prim.LocalID);
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}
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// m_newVelocity is velocity computed from linear motor
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// m_newVelocity is velocity computed from linear motor in world coordinates
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// Add the various forces into m_dir which will be our new direction vector (velocity)
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// add Gravity and Buoyancy
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// Gravity and Buoyancy
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// There is some gravity, make a gravity force vector that is applied after object velocity.
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// m_VehicleBuoyancy: -1=2g; 0=1g; 1=0g;
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// Vector3 grav = Prim.PhysicsScene.DefaultGravity * (Prim.Linkset.LinksetMass * (1f - m_VehicleBuoyancy));
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Vector3 grav = Prim.PhysicsScene.DefaultGravity * (1f - m_VehicleBuoyancy);
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/*
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* RA: Not sure why one would do this
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* RA: Not sure why one would do this unless we are hoping external forces are doing gravity, ...
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// Preserve the current Z velocity
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Vector3 vel_now = m_prim.Velocity;
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m_dir.Z = vel_now.Z; // Preserve the accumulated falling velocity
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@ -676,7 +651,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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else
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{
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float verticalError = pos.Z - m_VhoverTargetHeight;
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// RA: where does the 50 come from>
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// RA: where does the 50 come from?
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float verticalCorrectionVelocity = pTimestep * ((verticalError * 50.0f) / m_VhoverTimescale);
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// Replace Vertical speed with correction figure if significant
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if (Math.Abs(verticalError) > 0.01f)
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@ -784,37 +759,24 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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// m_angularFrictionTimescale // body angular velocity decay rate
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// m_lastAngularVelocity // what was last applied to body
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// Get what the body is doing, this includes 'external' influences
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Vector3 angularVelocity = Prim.ForceRotationalVelocity;
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if (m_angularMotorApply > 0)
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if (m_angularMotorDirection.LengthSquared() > 0.0001)
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{
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// Rather than snapping the angular motor velocity from the old value to
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// a newly set velocity, this routine steps the value from the previous
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// value (m_angularMotorVelocity) to the requested value (m_angularMotorDirection).
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// There are m_angularMotorApply steps.
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Vector3 origVel = m_angularMotorVelocity;
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Vector3 origDir = m_angularMotorDirection;
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// ramp up to new value
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// new velocity += error / ( time to get there / step interval)
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// requested speed - last motor speed
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m_angularMotorVelocity += (m_angularMotorDirection - m_angularMotorVelocity) / (m_angularMotorTimescale / pTimestep);
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// decay requested direction
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m_angularMotorDirection *= (1.0f - (pTimestep * 1.0f/m_angularMotorDecayTimescale));
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VDetailLog("{0},MoveAngular,angularMotorApply,apply={1},angTScale={2},timeStep={3},origvel={4},origDir={5},vel={6}",
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Prim.LocalID, m_angularMotorApply, m_angularMotorTimescale, pTimestep, origVel, origDir, m_angularMotorVelocity);
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m_angularMotorApply--;
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VDetailLog("{0},MoveAngular,angularMotorApply,angTScale={1},timeStep={2},origvel={3},origDir={4},vel={5}",
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Prim.LocalID, m_angularMotorTimescale, pTimestep, origVel, origDir, m_angularMotorVelocity);
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}
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else
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{
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// No motor recently applied, keep the body velocity
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// and decay the velocity
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if (m_angularMotorVelocity.LengthSquared() < 0.0001)
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m_angularMotorVelocity = Vector3.Zero;
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else
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m_angularMotorVelocity -= m_angularMotorVelocity / (m_angularMotorDecayTimescale / pTimestep);
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} // end motor section
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}
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#region Vertical attactor
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@ -824,22 +786,19 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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if (m_verticalAttractionTimescale < 300 && m_lastAngularVelocity != Vector3.Zero)
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{
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float VAservo = 0.2f;
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float VAservo = pTimestep * 0.2f / m_verticalAttractionTimescale;
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if (Prim.Linkset.LinksetIsColliding)
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VAservo = 0.05f / (m_verticalAttractionTimescale / pTimestep);
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VAservo = pTimestep * 0.05f / (m_verticalAttractionTimescale);
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VAservo *= (m_verticalAttractionEfficiency * m_verticalAttractionEfficiency);
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// get present body rotation
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Quaternion rotq = Prim.ForceOrientation;
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// vector pointing up
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Vector3 verticalError = Vector3.UnitZ;
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// rotate it to Body Angle
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verticalError = verticalError * rotq;
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// verticalError.X and .Y are the World error amounts. They are 0 when there is no error (Vehicle Body is 'vertical'), and .Z will be 1.
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// As the body leans to its side |.X| will increase to 1 and .Z fall to 0. As body inverts |.X| will fall and .Z will go
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// negative. Similar for tilt and |.Y|. .X and .Y must be modulated to prevent a stable inverted body.
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// Create a vector of the vehicle "up" in world coordinates
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Vector3 verticalError = Vector3.UnitZ * Prim.ForceOrientation;
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// verticalError.X and .Y are the World error amounts. They are 0 when there is no
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// error (Vehicle Body is 'vertical'), and .Z will be 1. As the body leans to its
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// side |.X| will increase to 1 and .Z fall to 0. As body inverts |.X| will fall
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// and .Z will go // negative. Similar for tilt and |.Y|. .X and .Y must be
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// modulated to prevent a stable inverted body.
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// Error is 0 (no error) to +/- 2 (max error)
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if (verticalError.Z < 0.0f)
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@ -850,13 +809,15 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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// scale it by VAservo
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verticalError = verticalError * VAservo;
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// As the body rotates around the X axis, then verticalError.Y increases; Rotated around Y then .X increases, so
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// Change Body angular velocity X based on Y, and Y based on X. Z is not changed.
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// As the body rotates around the X axis, then verticalError.Y increases; Rotated around Y
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// then .X increases, so change Body angular velocity X based on Y, and Y based on X.
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// Z is not changed.
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vertattr.X = verticalError.Y;
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vertattr.Y = - verticalError.X;
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vertattr.Z = 0f;
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// scaling appears better usingsquare-law
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Vector3 angularVelocity = Prim.ForceRotationalVelocity;
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float bounce = 1.0f - (m_verticalAttractionEfficiency * m_verticalAttractionEfficiency);
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vertattr.X += bounce * angularVelocity.X;
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vertattr.Y += bounce * angularVelocity.Y;
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@ -956,15 +917,22 @@ namespace OpenSim.Region.Physics.BulletSPlugin
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VDetailLog("{0},MoveAngular,zeroSmallValues,lastAngular={1}", Prim.LocalID, m_lastAngularVelocity);
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}
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// apply friction
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Vector3 decayamount = Vector3.One / (m_angularFrictionTimescale / pTimestep);
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m_lastAngularVelocity -= m_lastAngularVelocity * decayamount;
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// Apply to the body
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// The above calculates the absolute angular velocity needed
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Prim.ForceRotationalVelocity = m_lastAngularVelocity;
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// Prim.ForceRotationalVelocity = m_lastAngularVelocity;
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VDetailLog("{0},MoveAngular,done,decay={1},lastAngular={2}", Prim.LocalID, decayamount, m_lastAngularVelocity);
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// Apply a force to overcome current angular velocity
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Vector3 applyAngularForce = (m_lastAngularVelocity - Prim.ForceRotationalVelocity) * Prim.Linkset.LinksetMass;
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// Vector3 applyAngularForce = (m_lastAngularVelocity - Prim.ForceRotationalVelocity);
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// Prim.AddAngularForce(applyAngularForce, false);
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Prim.ApplyTorqueImpulse(applyAngularForce, false);
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// Apply friction for next time
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Vector3 decayamount = (Vector3.One / m_angularFrictionTimescale) * pTimestep;
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m_lastAngularVelocity *= Vector3.One - decayamount;
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VDetailLog("{0},MoveAngular,done,applyAForce={1},decay={2},lastAngular={3}",
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Prim.LocalID, applyAngularForce, decayamount, m_lastAngularVelocity);
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} //end MoveAngular
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internal void LimitRotation(float timestep)
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@ -299,7 +299,7 @@ public sealed class BSLinksetConstraints : BSLinkset
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// DEBUG: see of inter-linkset collisions are causing problems
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// BulletSimAPI.SetCollisionFilterMask2(LinksetRoot.BSBody.ptr,
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// (uint)CollisionFilterGroups.LinksetFilter, (uint)CollisionFilterGroups.LinksetMask);
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DetailLog("{0},BSLinksetConstraint.RecomputeLinksetConstraints,setCenterOfMass,rBody={1},linksetMass={2}",
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DetailLog("{0},BSLinksetConstraint.RecomputeLinksetConstraints,set,rBody={1},linksetMass={2}",
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LinksetRoot.LocalID, LinksetRoot.BSBody.ptr.ToString("X"), linksetMass);
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foreach (BSPhysObject child in m_children)
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@ -378,7 +378,9 @@ public sealed class BSPrim : BSPhysObject
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{
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OMV.Vector3 localInertia = BulletSimAPI.CalculateLocalInertia2(BSShape.ptr, physMass);
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BulletSimAPI.SetMassProps2(BSBody.ptr, physMass, localInertia);
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BulletSimAPI.UpdateInertiaTensor2(BSBody.ptr);
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// center of mass is at the zero of the object
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BulletSimAPI.SetCenterOfMassByPosRot2(BSBody.ptr, ForcePosition, ForceOrientation);
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// BulletSimAPI.UpdateInertiaTensor2(BSBody.ptr);
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DetailLog("{0},BSPrim.UpdateMassProperties,mass={1},localInertia={2}", LocalID, physMass, localInertia);
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}
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}
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@ -462,9 +464,16 @@ public sealed class BSPrim : BSPhysObject
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// Called from Scene when doing simulation step so we're in taint processing time.
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public override void StepVehicle(float timeStep)
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{
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if (IsPhysical)
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if (IsPhysical && _vehicle.IsActive)
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{
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_vehicle.Step(timeStep);
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/* // TEST TEST DEBUG DEBUG -- trying to reduce the extra action of Bullet simulation step
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PhysicsScene.PostTaintObject("BSPrim.StepVehicles", LocalID, delegate()
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{
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// This resets the interpolation values and recomputes the tensor variables
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BulletSimAPI.SetCenterOfMassByPosRot2(BSBody.ptr, ForcePosition, ForceOrientation);
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});
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*/
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}
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}
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@ -502,7 +511,9 @@ public sealed class BSPrim : BSPhysObject
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}
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public override OMV.Vector3 Torque {
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get { return _torque; }
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set { _torque = value;
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set {
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_torque = value;
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AddAngularForce(_torque, false, false);
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// DetailLog("{0},BSPrim.SetTorque,call,torque={1}", LocalID, _torque);
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}
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}
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@ -831,7 +842,7 @@ public sealed class BSPrim : BSPhysObject
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// m_log.DebugFormat("{0}: RotationalVelocity={1}", LogHeader, _rotationalVelocity);
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PhysicsScene.TaintedObject("BSPrim.setRotationalVelocity", delegate()
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{
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// DetailLog("{0},BSPrim.SetRotationalVel,taint,rotvel={1}", LocalID, _rotationalVelocity);
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DetailLog("{0},BSPrim.SetRotationalVel,taint,rotvel={1}", LocalID, _rotationalVelocity);
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BulletSimAPI.SetAngularVelocity2(BSBody.ptr, _rotationalVelocity);
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});
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}
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@ -972,14 +983,31 @@ public sealed class BSPrim : BSPhysObject
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}
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m_accumulatedAngularForces.Clear();
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}
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// DetailLog("{0},BSPrim.AddAngularForce,taint,aForce={1}", LocalID, fSum);
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DetailLog("{0},BSPrim.AddAngularForce,taint,aForce={1}", LocalID, fSum);
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if (fSum != OMV.Vector3.Zero)
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{
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BulletSimAPI.ApplyTorque2(BSBody.ptr, fSum);
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_torque = fSum;
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}
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};
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if (inTaintTime)
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addAngularForceOperation();
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else
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PhysicsScene.TaintedObject("BSPrim.AddForce", addAngularForceOperation);
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PhysicsScene.TaintedObject("BSPrim.AddAngularForce", addAngularForceOperation);
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}
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// A torque impulse.
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public void ApplyTorqueImpulse(OMV.Vector3 impulse, bool inTaintTime)
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{
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OMV.Vector3 applyImpulse = impulse;
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BSScene.TaintCallback applyTorqueImpulseOperation = delegate()
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{
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DetailLog("{0},BSPrim.ApplyTorqueImpulse,taint,tImpulse={1}", LocalID, applyImpulse);
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BulletSimAPI.ApplyTorqueImpulse2(BSBody.ptr, applyImpulse);
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};
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if (inTaintTime)
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applyTorqueImpulseOperation();
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else
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PhysicsScene.TaintedObject("BSPrim.ApplyTorqueImpulse", applyTorqueImpulseOperation);
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}
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public override void SetMomentum(OMV.Vector3 momentum) {
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// DetailLog("{0},BSPrim.SetMomentum,call,mom={1}", LocalID, momentum);
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@ -1418,8 +1446,9 @@ public sealed class BSPrim : BSPhysObject
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PositionSanityCheck(true);
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DetailLog("{0},BSPrim.UpdateProperties,call,pos={1},orient={2},vel={3},accel={4},rotVel={5}",
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LocalID, _position, _orientation, _velocity, _acceleration, _rotationalVelocity);
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OMV.Vector3 direction = OMV.Vector3.UnitX * _orientation;
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DetailLog("{0},BSPrim.UpdateProperties,call,pos={1},orient={2},dir={3},vel={4},rotVel={5}",
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LocalID, _position, _orientation, direction, _velocity, _rotationalVelocity);
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// BulletSimAPI.DumpRigidBody2(PhysicsScene.World.ptr, BSBody.ptr); // DEBUG DEBUG DEBUG
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