rotational_model.cpp

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/*
 * rotational_model.cpp
 *
 *  Created on: Oct 22, 2009
 *      Author: sturm
 */

#include "articulation_models/models/rotational_model.h"
#include "articulation_models/utils.h"

using namespace std;
using namespace articulation_msgs;

#include <iomanip>
#define VEC(a) setprecision(5)<<fixed<<a.x()<<" "<<a.y()<<" "<<a.z()<<" "<<a.w()<<" l="<<a.length()
#define VEC2(a) "t=["<<VEC(a.getOrigin())<<"] r=[]"<<VEC(a.getRotation())<<"]"
#define PRINT(a) cout << #a <<"=" << VEC(a)<<endl;
#define PRINT2(a) cout << #a <<"=" << VEC2(a)<<endl;

namespace articulation_models {


RotationalModel::RotationalModel() {
        rot_center = btVector3 (0,0,0);
        rot_axis = btQuaternion (0,0,0,1);
        rot_radius = 1;
        rot_orientation = btQuaternion (0,0,0,1);
        complexity = 3+2+1+3;   // rotation center + rotation axis + radius + orientation
        rot_mode = 0;// use position (=0) or orientation (=1) for configuration estimation
}

// -- params
void RotationalModel::readParamsFromModel() {
        GenericModel::readParamsFromModel();
        getParam("rot_center",rot_center);
        getParam("rot_axis",rot_axis);
        getParam("rot_radius",rot_radius);
        getParam("rot_orientation",rot_orientation);
        getParam("rot_mode",rot_mode);
}

void RotationalModel::writeParamsToModel() {
        GenericModel::writeParamsToModel();
        setParam("rot_center",rot_center,ParamMsg::PARAM);
        setParam("rot_axis",rot_axis,ParamMsg::PARAM);
        setParam("rot_radius",rot_radius,ParamMsg::PARAM);
        setParam("rot_orientation",rot_orientation,ParamMsg::PARAM);
        setParam("rot_mode",rot_mode,ParamMsg::PARAM);
}

V_Configuration RotationalModel::predictConfiguration(geometry_msgs::Pose pose) {
        V_Configuration q(1);

        if(rot_mode==1) {
                // estimate configuration from pose orientation
                btMatrix3x3 m_pose( poseToTransform(pose).getBasis() );
                btMatrix3x3 m_axis(rot_axis);
                btMatrix3x3 m_orient(rot_orientation);

                btMatrix3x3 rot_z = m_axis.inverse() * m_pose * m_orient.inverse();
                btQuaternion rot_z_quat;
                rot_z.getRotation(rot_z_quat);

                q(0) = rot_z_quat.getAngle();
        } else {

                btTransform center(rot_axis,rot_center);

                btTransform rel = center.inverseTimes( poseToTransform(pose) );

                q(0) = -atan2(rel.getOrigin().y(), rel.getOrigin().x());
        }

        return q;
}

geometry_msgs::Pose RotationalModel::predictPose(V_Configuration q) {
        geometry_msgs::Pose pose;

        btTransform center(rot_axis,rot_center);
        btTransform rotZ(btQuaternion(btVector3(0, 0, 1), -q[0]), btVector3(0, 0, 0));
        btTransform r(btQuaternion(0,0,0,1), btVector3(rot_radius, 0, 0));
        btTransform offset(rot_orientation, btVector3(0, 0, 0));

        pose = transformToPose( center * rotZ * r * offset );

        return pose;
}

bool RotationalModel::guessParameters() {
        if(model.track.pose.size() < 3)
                return false;

        size_t i,j,k;
        do{
                i = rand() % getSamples();
                j = rand() % getSamples();
                k = rand() % getSamples();
        } while (i==j || j==k || i==k);

        btTransform pose1 = poseToTransform(model.track.pose[i]);
        btTransform pose2 = poseToTransform(model.track.pose[j]);
        btTransform pose3 = poseToTransform(model.track.pose[k]);


//      if( pose1.getOrigin().distance(pose2.getOrigin())/sigma_position <
//              pose1.getRotation().angle(pose2.getRotation())/sigma_orientation
        if(rand() % 2 == 0)
        {
                rot_mode = 1;
//              cout <<"using rot computation"<<endl;

                // angle between pose 1 and pose 2
                double angle_12 = pose1.inverseTimes(pose2).getRotation().getAngle();

                // distance between pose 1 and pose 2
                double dist_12 = pose1.getOrigin().distance( pose2.getOrigin() );

                // rot axis between pose 1 and pose 2
                btVector3 rot_12 = pose1.getBasis() * pose1.inverseTimes(pose2).getRotation().getAxis() * -1;
//              PRINT(rot_12);

                rot_center = btVector3(0.5,0.5,0.5);
                rot_axis = btQuaternion(0,0,0,1);
                rot_orientation = btQuaternion(0,0,0,1);
                rot_radius = 0.0;

                rot_radius = (dist_12 * 0.5) / sin( angle_12 * 0.5 );

//              PRINT(pose1.getOrigin());
//              PRINT(pose2.getOrigin());
                btVector3 c1 = (pose1.getOrigin() + pose2.getOrigin())/2;
//              PRINT(c1);
                btVector3 v1 = (pose2.getOrigin() - pose1.getOrigin());
//              PRINT(v1);
                v1.normalize();
//              PRINT(v1);
                v1 = v1 - rot_12.dot(v1)*rot_12;
//              PRINT(v1);
                v1.normalize();
//              PRINT(v1);
//              PRINT(rot_12);
                rot_center = c1 + v1.cross(rot_12) * rot_radius * cos(angle_12/2);
//              PRINT(rot_center);

                btVector3 d(1,0,0);
                d = pose1.getOrigin() - rot_center;
                d.normalize();
//              PRINT(d);

                btVector3 rot_z = rot_12;
                btVector3 rot_x = d - rot_z.dot(d)*rot_z;
                rot_x.normalize();
                btVector3 rot_y = rot_z.cross(rot_x);
//              rot_x = btVector3(-1,0,0);
//              rot_y = btVector3(0,-1,0);
//              rot_z = btVector3(0,0,-1);
                btMatrix3x3(
                                rot_x.x(),rot_y.x(),rot_z.x(),
                                rot_x.y(),rot_y.y(),rot_z.y(),
                                rot_x.z(),rot_y.z(),rot_z.z()).getRotation(rot_axis);
//              PRINT(rot_x);
//              PRINT(rot_y);
//              PRINT(rot_z);
//              PRINT(rot_axis);
//              rot_axis=btQuaternion(0,0,0,1);

                rot_orientation = rot_axis.inverse() * pose1.getRotation();

                // eval ---------------------
                btTransform t_rotaxis(rot_axis,btVector3(0,0,0));
                btTransform t_radius(btQuaternion(0,0,0,1),btVector3(rot_radius,0,0));
                btTransform t_orient(rot_orientation,btVector3(0,0,0));
                btTransform t_rotcenter(btQuaternion(0,0,0,1),rot_center);

                // show diff to ppose1 and ppose2
                btTransform diff;
                btTransform pp1 =
                                t_rotcenter *
                                t_rotaxis *
                                btTransform(btQuaternion(btVector3(0,0,1),0.00),btVector3(0,0,0)) *
                                t_radius *
                                t_orient;
                diff = pose1.inverseTimes(pp1);
//              cout <<"pp1: angle=" <<0.00<<" poserr="<<diff.getOrigin().length()<<" orienterr="<<diff.getRotation().getAngle()<<endl;

                btTransform pp2 =
                                t_rotcenter *
                                t_rotaxis *
                                btTransform(btQuaternion(btVector3(0,0,1),angle_12),btVector3(0,0,0)) *
                                t_radius *
                                t_orient;
                diff = pose2.inverseTimes(pp2);
//              cout <<"pp2: angle=" <<angle_12<<" poserr="<<diff.getOrigin().length()<<" orienterr="<<diff.getRotation().getAngle()<<endl;

                for(size_t a=0;a<getSamples();a++) {
                        V_Configuration q =predictConfiguration(model.track.pose[a]);
                        btTransform p2 = poseToTransform(predictPose(q));
                        diff = poseToTransform(model.track.pose[a]).inverseTimes(p2);
//                      cout <<"angle=" <<q[0]<<" poserr="<<diff.getOrigin().length()<<" orienterr="<<diff.getRotation().getAngle()<<endl;
//                      btTransform pp =
//                                      t_rotcenter *
//                                      t_rotaxis *
//                                      btTransform(btQuaternion(btVector3(0,0,1),-q[0]),btVector3(0,0,0)) *
//                                      t_radius *
//                                      t_orient;
//                      diff = poseToTransform(model.track.pose[a]).inverseTimes(pp);
//                      cout <<"vs angle=" <<q[0]<<" poserr="<<diff.getOrigin().length()<<" orienterr="<<diff.getRotation().getAngle()<<endl;
                }
        } else {
                rot_mode = 0;
//              cout<<"using plane computation"<<endl;
                // first, find the plane
                btVector3 plane_pos = pose1.getOrigin();
                btVector3 plane_v = pose2.getOrigin() - pose1.getOrigin();
                btVector3 plane_w = pose3.getOrigin() - pose1.getOrigin();
        //      PRINT(plane_pos);
        //      PRINT(plane_v);
        //      PRINT(plane_w);
                plane_v.normalize();
                plane_w.normalize();

                btVector3 plane_x = plane_v;
                btVector3 plane_y = plane_w - (plane_w.dot(plane_v))*plane_v;
                plane_x.normalize();
                plane_y.normalize();
                btVector3 plane_z = plane_x.cross(plane_y);
        //      PRINT(plane_x);
        //      PRINT(plane_y);
        //      PRINT(plane_z);


                btMatrix3x3 plane_rot(
                                plane_x.x(),plane_y.x(),plane_z.x(),
                                plane_x.y(),plane_y.y(),plane_z.y(),
                                plane_x.z(),plane_y.z(),plane_z.z()
                                );

                btTransform plane(plane_rot,plane_pos);

                btTransform onplane_pose1 = plane.inverseTimes(pose1);
                btTransform onplane_pose2 = plane.inverseTimes(pose2);
                btTransform onplane_pose3 = plane.inverseTimes(pose3);
        //      cout <<"onplane_pose1"<<VEC2(onplane_pose1)<<endl;
        //      cout <<"onplane_pose2"<<VEC2(onplane_pose2)<<endl;
        //      cout <<"onplane_pose3"<<VEC2(onplane_pose3)<<endl;

                //http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
                btVector3 p1 = (onplane_pose1.getOrigin() + onplane_pose2.getOrigin())/2;
                btVector3 p21 = (onplane_pose2.getOrigin() - onplane_pose1.getOrigin()).rotate(btVector3(0,0,1),M_PI/2);;

                btVector3 p3 = (onplane_pose1.getOrigin() + onplane_pose3.getOrigin())/2;
                btVector3 p43 = (onplane_pose3.getOrigin() - onplane_pose1.getOrigin()).rotate(btVector3(0,0,1),M_PI/2);;

                btVector3 p13 = p1 - p3;

                double u =      ( p43.x()*p13.y() - p43.y()*p13.x() ) /
                                        ( p43.y()*p21.x() - p43.x()*p21.y() );
                btVector3 onplane_center = p1 + u*p21;

                btTransform rotcenter(plane_rot,plane * onplane_center);
                rot_center = rotcenter.getOrigin();
                rot_axis = rotcenter.getRotation();

                rot_radius = rotcenter.inverseTimes(pose1).getOrigin().length();
                rot_orientation = btQuaternion(0,0,0,1);
                V_Configuration q = predictConfiguration( model.track.pose[i]);
        //      cout <<"q="<<q[0]<<endl;
                btTransform pred1 = poseToTransform( predictPose(q) );
        //      PRINT2(pose1);
        //      PRINT2(pred1);
                rot_orientation = pred1.inverseTimes(pose1).getRotation();
        }

//      cout<<"rot_radius="<<rot_radius<<endl;
//      PRINT(rot_center);
//      PRINT(rot_axis);
//      PRINT(rot_orientation);

        if(!check_values(rot_center)) return false;
        if(!check_values(rot_axis)) return false;
        if(!check_values(rot_radius)) return false;
        if(!check_values(rot_orientation)) return false;

        return true;
}

void RotationalModel::updateParameters(std::vector<double> delta) {
        rot_center = rot_center + btVector3(delta[0],delta[1],delta[2]);
        btQuaternion q;
        q.setRPY(delta[3],delta[4],0.00);
        rot_axis = rot_axis * q;

        rot_radius = rot_radius + delta[5];

        btQuaternion q2;
        q2.setRPY(delta[6],delta[7],delta[8]);
        rot_orientation = rot_orientation * q2;
}

bool RotationalModel::normalizeParameters() {
//      if(model.track.pose.size()>2) {
//              {
//                      V_Configuration q = predictConfiguration(model.track.pose.front());
//                      rot_axis = rot_axis * btQuaternion(btVector3(0, 0, 1), -q[0]);
//              }
//              if(predictConfiguration(model.track.pose.back())[0]<0)
//                      rot_axis = rot_axis * btQuaternion(btVector3(1,0,0),M_PI);
//
//              rot_orientation = rot_axis.inverse() * poseToTransform(model.track.pose.front()).getRotation();
//      }
        return true;
}
}

---

articulation_models
Author(s): Juergen Sturm
autogenerated on Fri Jan 11 10:06:58 2013