lovr-ODE/ode/demo/demo_jointPR.cpp

/*************************************************************************
 *                                                                       *
 * Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith.       *
 * All rights reserved.  Email: [email protected]   Web: www.q12.org          *
 *                                                                       *
 * This library is free software; you can redistribute it and/or         *
 * modify it under the terms of EITHER:                                  *
 *   (1) The GNU Lesser General Public License as published by the Free  *
 *       Software Foundation; either version 2.1 of the License, or (at  *
 *       your option) any later version. The text of the GNU Lesser      *
 *       General Public License is included with this library in the     *
 *       file LICENSE.TXT.                                               *
 *   (2) The BSD-style license that is included with this library in     *
 *       the file LICENSE-BSD.TXT.                                       *
 *                                                                       *
 * This library is distributed in the hope that it will be useful,       *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files    *
 * LICENSE.TXT and LICENSE-BSD.TXT for more details.                     *
 *                                                                       *
 *************************************************************************/

/*

This file try to demonstrate how the PR joint is working.

The axisP is draw in red and the axisR is in green

*/


#include <ode/ode.h>
#include <drawstuff/drawstuff.h>
#include <iostream>
#include <math.h>
#include "texturepath.h"


#ifdef _MSC_VER
#pragma warning(disable:4244 4305)  // for VC++, no precision loss complaints
#endif
// select correct drawing functions
#ifdef dDOUBLE
#define dsDrawBox dsDrawBoxD
#endif


// physics parameters
#define BOX1_LENGTH 2    // Size along the X axis
#define BOX1_WIDTH 1     // Size along the Y axis
#define BOX1_HEIGHT 0.4  // Size along the Z axis (up) since gravity is (0,0,-10)
#define BOX2_LENGTH 0.2
#define BOX2_WIDTH 0.1
#define BOX2_HEIGHT 0.4
#define Mass1 10
#define Mass2 0.1


#define PRISMATIC_ONLY 1
#define ROTOIDE_ONLY   2
int flag = 0;


//camera view
static float xyz[3] = {2.0f,-3.5f,2.0000f};
static float hpr[3] = {90.000f,-25.5000f,0.0000f};
//world,space,body & geom
static dWorldID world;
static dSpaceID space;
static dSpaceID box1_space;
static dBodyID box1_body[1];
static dBodyID box2_body[1];
static dJointID joint[1];
static dJointGroupID contactgroup;
static dGeomID ground;
static dGeomID box1[1];
static dGeomID box2[1];


//collision detection
static void nearCallback (void *data, dGeomID o1, dGeomID o2)
{
    int i,n;

    dBodyID b1 = dGeomGetBody(o1);
    dBodyID b2 = dGeomGetBody(o2);
    if (b1 && b2 && dAreConnectedExcluding (b1,b2,dJointTypeContact)) return;
    const int N = 10;
    dContact contact[N];
    n = dCollide (o1,o2,N,&contact[0].geom,sizeof(dContact));
    if (n > 0)
    {
        for (i=0; i<n; i++)
        {
            contact[i].surface.mode = dContactSlip1 | dContactSlip2 |
                                      dContactSoftERP | dContactSoftCFM | dContactApprox1;
            contact[i].surface.mu = 0.1;
            contact[i].surface.slip1 = 0.02;
            contact[i].surface.slip2 = 0.02;
            contact[i].surface.soft_erp = 0.1;
            contact[i].surface.soft_cfm = 0.0001;
            dJointID c = dJointCreateContact (world,contactgroup,&contact[i]);
            dJointAttach (c,dGeomGetBody(contact[i].geom.g1),dGeomGetBody(contact[i].geom.g2));
        }
    }
}


// start simulation - set viewpoint
static void start()
{
    dAllocateODEDataForThread(dAllocateMaskAll);

    dsSetViewpoint (xyz,hpr);
    printf ("Press 'd' to add force along positive x direction.\nPress 'a' to add force along negative x direction.\n");
    printf ("Press 'w' to add force along positive y direction.\nPress 's' to add force along negative y direction.\n");
    printf ("Press 'e' to add torque around positive z direction.\nPress 'q' to add torque around negative z direction.\n");
    printf ("Press 'o' to add force around positive x direction \n");

    printf("Press 'v' to give a defined velocity and add a FMax to the rotoide axis\n");
    printf("Press 'c' to set the velocity to zero and remove the FMax\n");

    printf("Press 'l' to add limits (-0.5 to 0.5rad) on the rotoide axis\n");
    printf("Press 'k' to remove the limits on the rotoide axis\n");

    printf("Press 'i' to get joint info\n");
}

// function to update camera position at each step.
void update()
{
// 		const dReal *a =(dBodyGetPosition (box1_body[0]));
// 		float dx=a[0];
// 		float dy=a[1];
// 		float dz=a[2];
// 		xyz[0]=dx;
// 		xyz[1]=dy-5;
// 		xyz[2]=dz+2;
// 		hpr[1]=-22.5000f;
// 		dsSetViewpoint (xyz,hpr);
}


// called when a key pressed
static void command (int cmd)
{
    switch (cmd)
    {
    case 'w':
    case 'W':
        dBodyAddForce(box2_body[0],0,500,0);
        std::cout<<(dBodyGetPosition(box2_body[0])[1]-dBodyGetPosition(box1_body[0])[1])<<'\n';
        break;
    case 's':
    case 'S':
        dBodyAddForce(box2_body[0],0,-500,0);
        std::cout<<(dBodyGetPosition(box2_body[0])[1]-dBodyGetPosition(box1_body[0])[1])<<'\n';
        break;
    case 'd':
    case 'D':
        dBodyAddForce(box2_body[0],500,0,0);
        std::cout<<(dBodyGetPosition(box2_body[0])[0]-dBodyGetPosition(box1_body[0])[0])<<'\n';
        break;
    case 'a':
    case 'A':
        dBodyAddForce(box2_body[0],-500,0,0);
        std::cout<<(dBodyGetPosition(box2_body[0])[0]-dBodyGetPosition(box1_body[0])[0])<<'\n';
        break;
    case 'e':
    case 'E':
        dBodyAddRelTorque(box2_body[0],0,0,200);
        break;
    case 'q':
    case 'Q':
        dBodyAddRelTorque(box2_body[0],0,0,-200);
        break;
    case 'o':
    case 'O':
        dBodyAddForce(box1_body[0],10000,0,0);
        break;

    case 'v':
    case 'V':
        dJointSetPRParam(joint[0], dParamVel2, 2);
        dJointSetPRParam(joint[0], dParamFMax2, 500);
        break;

    case 'c':
    case 'C':
        dJointSetPRParam(joint[0], dParamVel2, 0);
        dJointSetPRParam(joint[0], dParamFMax2, 0);
        break;

    case 'l':
    case 'L':
        dJointSetPRParam(joint[0], dParamLoStop2, -0.5);
        dJointSetPRParam(joint[0], dParamHiStop2,  0.5);
        break;

    case 'k':
    case 'K':
        dJointSetPRParam(joint[0], dParamLoStop2, -dInfinity);
        dJointSetPRParam(joint[0], dParamHiStop2,  dInfinity);
        break;

    case 'i':
    case 'I':
        dVector3 anchor;
        dJointGetPRAnchor(joint[0], anchor);
        dReal angle = dJointGetPRAngle(joint[0]);
        dReal w = dJointGetPRAngleRate(joint[0]);

        dReal l = dJointGetPRPosition(joint[0]);
        dReal v = dJointGetPRPositionRate(joint[0]);

        printf("Anchor: [%6.4lf, %6.4lf, %6.4lf]\n", anchor[0], anchor[1], anchor[2]);
        printf("Position: %7.4lf, Rate: %7.4lf\n", l, v);
        printf("Angle: %7.4lf, Rate: %7.4lf\n", angle, w);
        break;
    }
}


// simulation loop
static void simLoop (int pause)
{
    if (!pause)
    {
        //draw 2 boxes
        dVector3 ss;
        dsSetTexture (DS_WOOD);

        const dReal *posBox2 = dGeomGetPosition(box2[0]);
        const dReal *rotBox2 = dGeomGetRotation(box2[0]);
        dsSetColor (1,1,0);
        dGeomBoxGetLengths (box2[0],ss);
        dsDrawBox (posBox2, rotBox2, ss);

        const dReal *posBox1 = dGeomGetPosition(box1[0]);
        const dReal *rotBox1 = dGeomGetRotation(box1[0]);
        dsSetColor (1,1,2);
        dGeomBoxGetLengths (box1[0], ss);
        dsDrawBox (posBox1, rotBox1, ss);

        dVector3 anchorPos;
        dJointGetPRAnchor (joint[0], anchorPos);

        // Draw the axisP
        if (ROTOIDE_ONLY != flag )
        {
            dsSetColor (1,0,0);
            dVector3 sizeP = {0, 0.1, 0.1};
            for (int i=0; i<3; ++i)
                sizeP[0] += (anchorPos[i] - posBox1[i])*(anchorPos[i] - posBox1[i]);
            sizeP[0] = sqrt(sizeP[0]);
            dVector3 posAxisP;
            for (int i=0; i<3; ++i)
                posAxisP[i] = posBox1[i] + (anchorPos[i] - posBox1[i])/2.0;
            dsDrawBox (posAxisP, rotBox1, sizeP);
        }


        // Draw the axisR
        if (PRISMATIC_ONLY != flag )
        {
            dsSetColor (0,1,0);
            dVector3 sizeR = {0, 0.1, 0.1};
            for (int i=0; i<3; ++i)
                sizeR[0] += (anchorPos[i] - posBox2[i])*(anchorPos[i] - posBox2[i]);
            sizeR[0] = sqrt(sizeR[0]);
            dVector3 posAxisR;
            for (int i=0; i<3; ++i)
                posAxisR[i] = posBox2[i] + (anchorPos[i] - posBox2[i])/2.0;
            dsDrawBox (posAxisR, rotBox2, sizeR);
        }

        dSpaceCollide (space,0,&nearCallback);
        dWorldQuickStep (world,0.0001);
        update();
        dJointGroupEmpty (contactgroup);
    }
}


void Help(char **argv)
{
    printf("%s ", argv[0]);
    printf(" -h | --help : print this help\n");
    printf(" -b | --both : Display how the complete joint works\n");
    printf("               Default behavior\n");
    printf(" -p | --prismatic-only : Display how the prismatic part works\n");
    printf("                         The anchor pts is set at the center of body 2\n");
    printf(" -r | --rotoide-only   : Display how the rotoide part works\n");
    printf("                         The anchor pts is set at the center of body 1\n");
    printf(" -t | --texture-path path  : Path to the texture.\n");
    printf("                             Default = %s\n", DRAWSTUFF_TEXTURE_PATH);
    printf("--------------------------------------------------\n");
    printf("Hit any key to continue:");
    getchar();

    exit(0);
}

int main (int argc, char **argv)
{
    // setup pointers to drawstuff callback functions
    dsFunctions fn;
    fn.version = DS_VERSION;
    fn.start = &start;
    fn.step = &simLoop;
    fn.command = &command;
    fn.stop = 0;
    fn.path_to_textures = DRAWSTUFF_TEXTURE_PATH;

    if (argc >= 2 )
    {
        for (int i=1; i < argc; ++i)
        {
            if (  0 == strcmp("-h", argv[i]) || 0 == strcmp("--help", argv[i]) )
                Help(argv);

            if (!flag && (0 == strcmp("-p", argv[i]) ||0 == strcmp("--prismatic-only", argv[i])) )
                flag = PRISMATIC_ONLY;

            if (!flag && (0 == strcmp("-r", argv[i]) || 0 == strcmp("--rotoide-only", argv[i])) )
                flag = ROTOIDE_ONLY;

            if (0 == strcmp("-t", argv[i]) || 0 == strcmp("--texture-path", argv[i]))
            {
                int j = i+1;
                if ( j+1 > argc      ||  // Check if we have enough arguments
                        argv[j] == '\0' ||  // We should have a path here
                        argv[j][0] == '-' ) // We should have a path not a command line
                    Help(argv);
                else
                    fn.path_to_textures = argv[++i]; // Increase i since we use this argument
            }
        }
    }

    dInitODE2(0);

    // create world
    world = dWorldCreate();
    space = dHashSpaceCreate (0);
    contactgroup = dJointGroupCreate (0);
    dWorldSetGravity (world,0,0,-10);
    ground = dCreatePlane (space,0,0,1,0);

    //create two boxes
    dMass m;
    box1_body[0] = dBodyCreate (world);
    dMassSetBox (&m,1,BOX1_LENGTH,BOX1_WIDTH,BOX1_HEIGHT);
    dMassAdjust (&m,Mass1);
    dBodySetMass (box1_body[0],&m);
    box1[0] = dCreateBox (0,BOX1_LENGTH,BOX1_WIDTH,BOX1_HEIGHT);
    dGeomSetBody (box1[0],box1_body[0]);

    box2_body[0] = dBodyCreate (world);
    dMassSetBox (&m,10,BOX2_LENGTH,BOX2_WIDTH,BOX2_HEIGHT);
    dMassAdjust (&m,Mass2);
    dBodySetMass (box2_body[0],&m);
    box2[0] = dCreateBox (0,BOX2_LENGTH,BOX2_WIDTH,BOX2_HEIGHT);
    dGeomSetBody (box2[0],box2_body[0]);

    //set the initial positions of body1 and body2
    dMatrix3 R;
    dRSetIdentity(R);
    dBodySetPosition (box1_body[0],0,0,BOX1_HEIGHT/2.0);
    dBodySetRotation (box1_body[0], R);

    dBodySetPosition (box2_body[0],
                      2.1,
                      0.0,
                      BOX2_HEIGHT/2.0);
    dBodySetRotation (box2_body[0], R);


    //set PR joint
    joint[0] = dJointCreatePR(world,0);
    dJointAttach (joint[0],box1_body[0],box2_body[0]);
    switch (flag)
    {
    case PRISMATIC_ONLY:
        dJointSetPRAnchor (joint[0],
                           2.1,
                           0.0,
                           BOX2_HEIGHT/2.0);
        dJointSetPRParam (joint[0],dParamLoStop, -0.5);
        dJointSetPRParam (joint[0],dParamHiStop, 1.5);
        break;

    case ROTOIDE_ONLY:
        dJointSetPRAnchor (joint[0],
                           0.0,
                           0.0,
                           BOX2_HEIGHT/2.0);
        dJointSetPRParam (joint[0],dParamLoStop, 0.0);
        dJointSetPRParam (joint[0],dParamHiStop, 0.0);
        break;

    default:
        dJointSetPRAnchor (joint[0],
                           1.1,
                           0.0,
                           BOX2_HEIGHT/2.0);
        dJointSetPRParam (joint[0],dParamLoStop, -0.5);
        dJointSetPRParam (joint[0],dParamHiStop, 1.5);
        break;
    }

    dJointSetPRAxis1(joint[0],1,0,0);
    dJointSetPRAxis2(joint[0],0,0,1);
// We position  the 2 body
// The position of the rotoide joint is on the second body so it can rotate on itself
// and move along the X axis.
// With this anchor
// - A force in X will move only the body 2 inside the low and hi limit
//   of the prismatic
// - A force in Y will make the 2 bodies to rotate around on the plane

    box1_space = dSimpleSpaceCreate (space);
    dSpaceSetCleanup (box1_space,0);
    dSpaceAdd(box1_space,box1[0]);

    // run simulation
    dsSimulationLoop (argc,argv,400,300,&fn);
    dJointGroupDestroy (contactgroup);
    dSpaceDestroy (space);
    dWorldDestroy (world);
    dCloseODE();
    return 0;
}