private Matrix3d computeDesiredFootRotation(
double angleToDestination, RobotSide swingLegSide, ReferenceFrame supportFootFrame) {
RigidBodyTransform supportFootToWorldTransform =
supportFootFrame.getTransformToDesiredFrame(ReferenceFrame.getWorldFrame());
Matrix3d supportFootToWorldRotation = new Matrix3d();
supportFootToWorldTransform.get(supportFootToWorldRotation);
double maxTurnInAngle = 0.25;
double maxTurnOutAngle = 0.4;
double amountToYaw;
switch (blindWalkingDirection.getEnumValue()) {
case BACKWARD:
{
amountToYaw = AngleTools.computeAngleDifferenceMinusPiToPi(angleToDestination, Math.PI);
break;
}
case LEFT:
{
amountToYaw =
AngleTools.computeAngleDifferenceMinusPiToPi(angleToDestination, Math.PI / 2.0);
break;
}
case RIGHT:
{
amountToYaw =
AngleTools.computeAngleDifferenceMinusPiToPi(angleToDestination, -Math.PI / 2.0);
break;
}
case FORWARD:
{
amountToYaw = angleToDestination;
break;
}
default:
{
throw new RuntimeException("Shouldn't get here!");
}
}
if (swingLegSide == RobotSide.LEFT) {
amountToYaw = MathTools.clipToMinMax(amountToYaw, -maxTurnInAngle, maxTurnOutAngle);
} else {
amountToYaw = MathTools.clipToMinMax(amountToYaw, -maxTurnOutAngle, maxTurnInAngle);
}
Matrix3d yawRotation = new Matrix3d();
yawRotation.rotZ(amountToYaw);
Matrix3d ret = new Matrix3d();
ret.mul(yawRotation, supportFootToWorldRotation);
return ret;
}
public Matrix3d getViewMatrix(int index) {
Matrix3d m = new Matrix3d();
switch (index) {
case 0:
m.setIdentity(); // C4 vertex-centered
break;
case 1:
m.rotX(-0.5 * TETRAHEDRAL_ANGLE); // C3 face-centered 2.0*Math.PI/3
Matrix3d m1 = new Matrix3d();
m1.rotZ(Math.PI / 4);
m.mul(m1);
break;
case 2:
m.rotY(Math.PI / 4); // side face-centered
break;
default:
throw new IllegalArgumentException("getViewMatrix: index out of range:" + index);
}
return m;
}