public override MBoolResponse Initialize(MAvatarDescription avatarDescription, Dictionary <string, string> properties)
{
base.Initialize(avatarDescription, properties);
//Setuo the skeleton access
this.SkeletonAccess = new IntermediateSkeleton();
this.SkeletonAccess.InitializeAnthropometry(avatarDescription);
//Initial rotations
this.initialHeadRotation = SkeletonAccess.GetLocalJointRotation(AvatarDescription.AvatarID, MJointType.HeadJoint);
this.initialNeckRotation = SkeletonAccess.GetLocalJointRotation(AvatarDescription.AvatarID, MJointType.C4C5Joint);
return(new MBoolResponse(true));
}
/// <summary>
/// Default do step routine
/// </summary>
/// <param name="time"></param>
/// <param name="simulationState"></param>
/// <returns></returns>
public override MSimulationResult DoStep(double time, MSimulationState simulationState)
{
//Create a new simulation result
MSimulationResult result = new MSimulationResult()
{
Events = simulationState.Events ?? new List <MSimulationEvent>(),
Constraints = simulationState.Constraints ?? new List <MConstraint>(),
SceneManipulations = simulationState.SceneManipulations ?? new List <MSceneManipulation>(),
Posture = simulationState.Current
};
//Set the channel data to reflect to current posture
SkeletonAccess.SetChannelData(simulationState.Current);
//Set the default rotation of the head and neck joints
SkeletonAccess.SetLocalJointRotation(AvatarDescription.AvatarID, MJointType.HeadJoint, initialHeadRotation);
SkeletonAccess.SetLocalJointRotation(AvatarDescription.AvatarID, MJointType.C4C5Joint, initialNeckRotation);
//Create a transform representing the current head location
MTransform currentTransform = new MTransform()
{
ID = "",
Position = SkeletonAccess.GetGlobalJointPosition(AvatarDescription.AvatarID, MJointType.HeadJoint),
Rotation = SkeletonAccess.GetGlobalJointRotation(AvatarDescription.AvatarID, MJointType.HeadJoint)
};
//Create a transform representing the parent location (neck)
MTransform parentTransform = new MTransform()
{
ID = "",
Position = SkeletonAccess.GetGlobalJointPosition(AvatarDescription.AvatarID, MJointType.C4C5Joint),
Rotation = SkeletonAccess.GetGlobalJointRotation(AvatarDescription.AvatarID, MJointType.C4C5Joint)
};
//The current head forward vector
MVector3 currentHeadForward = new MVector3(-1, 0, 0);
//Compute the local position of the desired object (relative to the neck)
MVector3 localPosition = parentTransform.InverseTransformPoint(this.gazeTarget.Position);
//Get the xz distance in local space
float distance = new MVector3(localPosition.X, 0, localPosition.Z).Magnitude();
float height = (float)localPosition.Y;
//Compute the current angle
float currentAngle = (float)(Math.Atan(height / distance) * 180 / Math.PI);
//Limit if below lower limit
if (currentAngle < lowerLimit)
{
localPosition.Y = Math.Tan(lowerLimit * Math.PI / 180) * distance;
}
//Limit if above upper angle limit
if (currentAngle > upperLimit)
{
localPosition.Y = Math.Tan(upperLimit * Math.PI / 180) * distance;
}
float maxYAngle = 80f;
//Limit xz position
float yAngle = (float)MVector3Extensions.Angle(currentHeadForward, new MVector3(localPosition.X, 0, localPosition.Z));
if (yAngle > maxYAngle)
{
//The interpolated direction
MVector3 interpolatedDirection = MVector3Extensions.Lerp(currentHeadForward, new MVector3(localPosition.X, 0, localPosition.Z).Normalize(), (maxYAngle / yAngle)).Normalize();
//Perform correction
MVector3 newLocalPositionsXZ = interpolatedDirection.Multiply(distance);
localPosition.X = newLocalPositionsXZ.X;
localPosition.Z = newLocalPositionsXZ.Z;
}
//Compute the desired and current facing direction
MVector3 desiredHeadForward = localPosition.Normalize();
//Estimate the rotation that is required to rotate from the current head direction towards the desired one
MQuaternion deltaRotation = FromToRotation(currentHeadForward, new MVector3(desiredHeadForward.X, -desiredHeadForward.Y, desiredHeadForward.Z));
//Gather the current location rotation
MQuaternion currentLocalRotation = SkeletonAccess.GetLocalJointRotation(AvatarDescription.AvatarID, MJointType.HeadJoint);
//Update the local joint rotation to adjust the facing direction to the desired values
SkeletonAccess.SetLocalJointRotation(AvatarDescription.AvatarID, MJointType.HeadJoint, currentLocalRotation.Multiply(deltaRotation));
//Set the updated postures
result.Posture = SkeletonAccess.RecomputeCurrentPostureValues(AvatarDescription.AvatarID);
//Return the simulation results
return(result);
}
