from the start... checking in ode-0.9

1 files changed, 325 insertions, 0 deletions

diff --git a/libraries/ode-0.9/ode/demo/demo_buggy.cpp b/libraries/ode-0.9/ode/demo/demo_buggy.cpp
new file mode 100644
index 0000000..a482e02
--- /dev/null
+++ b/libraries/ode-0.9/ode/demo/demo_buggy.cpp
@@ -0,0 +1,325 @@
+/*************************************************************************
+ *                                                                       *
+ * Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith.       *
+ * All rights reserved.  Email: russ@q12.org   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.                     *
+ *                                                                       *
+ *************************************************************************/
+
+/*
+
+buggy with suspension.
+this also shows you how to use geom groups.
+
+*/
+
+
+#include <ode/ode.h>
+#include <drawstuff/drawstuff.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
+#define dsDrawSphere dsDrawSphereD
+#define dsDrawCylinder dsDrawCylinderD
+#define dsDrawCapsule dsDrawCapsuleD
+#endif
+
+
+// some constants
+
+#define LENGTH 0.7      // chassis length
+#define WIDTH 0.5       // chassis width
+#define HEIGHT 0.2      // chassis height
+#define RADIUS 0.18     // wheel radius
+#define STARTZ 0.5      // starting height of chassis
+#define CMASS 1         // chassis mass
+#define WMASS 0.2       // wheel mass
+
+
+// dynamics and collision objects (chassis, 3 wheels, environment)
+
+static dWorldID world;
+static dSpaceID space;
+static dBodyID body[4];
+static dJointID joint[3];       // joint[0] is the front wheel
+static dJointGroupID contactgroup;
+static dGeomID ground;
+static dSpaceID car_space;
+static dGeomID box[1];
+static dGeomID sphere[3];
+static dGeomID ground_box;
+
+
+// things that the user controls
+
+static dReal speed=0,steer=0;   // user commands
+
+
+
+// this is called by dSpaceCollide when two objects in space are
+// potentially colliding.
+
+static void nearCallback (void *data, dGeomID o1, dGeomID o2)
+{
+  int i,n;
+
+  // only collide things with the ground
+  int g1 = (o1 == ground || o1 == ground_box);
+  int g2 = (o2 == ground || o2 == ground_box);
+  if (!(g1 ^ g2)) 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 = dInfinity;
+      contact[i].surface.slip1 = 0.1;
+      contact[i].surface.slip2 = 0.1;
+      contact[i].surface.soft_erp = 0.5;
+      contact[i].surface.soft_cfm = 0.3;
+      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()
+{
+  static float xyz[3] = {0.8317f,-0.9817f,0.8000f};
+  static float hpr[3] = {121.0000f,-27.5000f,0.0000f};
+  dsSetViewpoint (xyz,hpr);
+  printf ("Press:\t'a' to increase speed.\n"
+          "\t'z' to decrease speed.\n"
+          "\t',' to steer left.\n"
+          "\t'.' to steer right.\n"
+          "\t' ' to reset speed and steering.\n"
+          "\t'1' to save the current state to 'state.dif'.\n");
+}
+
+
+// called when a key pressed
+
+static void command (int cmd)
+{
+  switch (cmd) {
+  case 'a': case 'A':
+    speed += 0.3;
+    break;
+  case 'z': case 'Z':
+    speed -= 0.3;
+    break;
+  case ',':
+    steer -= 0.5;
+    break;
+  case '.':
+    steer += 0.5;
+    break;
+  case ' ':
+    speed = 0;
+    steer = 0;
+    break;
+  case '1': {
+      FILE *f = fopen ("state.dif","wt");
+      if (f) {
+        dWorldExportDIF (world,f,"");
+        fclose (f);
+      }
+    }
+  }
+}
+
+
+// simulation loop
+
+static void simLoop (int pause)
+{
+  int i;
+  if (!pause) {
+    // motor
+    dJointSetHinge2Param (joint[0],dParamVel2,-speed);
+    dJointSetHinge2Param (joint[0],dParamFMax2,0.1);
+
+    // steering
+    dReal v = steer - dJointGetHinge2Angle1 (joint[0]);
+    if (v > 0.1) v = 0.1;
+    if (v < -0.1) v = -0.1;
+    v *= 10.0;
+    dJointSetHinge2Param (joint[0],dParamVel,v);
+    dJointSetHinge2Param (joint[0],dParamFMax,0.2);
+    dJointSetHinge2Param (joint[0],dParamLoStop,-0.75);
+    dJointSetHinge2Param (joint[0],dParamHiStop,0.75);
+    dJointSetHinge2Param (joint[0],dParamFudgeFactor,0.1);
+
+    dSpaceCollide (space,0,&nearCallback);
+    dWorldStep (world,0.05);
+
+    // remove all contact joints
+    dJointGroupEmpty (contactgroup);
+  }
+
+  dsSetColor (0,1,1);
+  dsSetTexture (DS_WOOD);
+  dReal sides[3] = {LENGTH,WIDTH,HEIGHT};
+  dsDrawBox (dBodyGetPosition(body[0]),dBodyGetRotation(body[0]),sides);
+  dsSetColor (1,1,1);
+  for (i=1; i<=3; i++) dsDrawCylinder (dBodyGetPosition(body[i]),
+                                       dBodyGetRotation(body[i]),0.02f,RADIUS);
+
+  dVector3 ss;
+  dGeomBoxGetLengths (ground_box,ss);
+  dsDrawBox (dGeomGetPosition(ground_box),dGeomGetRotation(ground_box),ss);
+
+  /*
+  printf ("%.10f %.10f %.10f %.10f\n",
+          dJointGetHingeAngle (joint[1]),
+          dJointGetHingeAngle (joint[2]),
+          dJointGetHingeAngleRate (joint[1]),
+          dJointGetHingeAngleRate (joint[2]));
+  */
+}
+
+
+int main (int argc, char **argv)
+{
+  int i;
+  dMass m;
+
+  // 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/textures";
+  if(argc==2)
+    {
+        fn.path_to_textures = argv[1];
+    }
+
+  // create world
+  dInitODE();
+  world = dWorldCreate();
+  space = dHashSpaceCreate (0);
+  contactgroup = dJointGroupCreate (0);
+  dWorldSetGravity (world,0,0,-0.5);
+  ground = dCreatePlane (space,0,0,1,0);
+
+  // chassis body
+  body[0] = dBodyCreate (world);
+  dBodySetPosition (body[0],0,0,STARTZ);
+  dMassSetBox (&m,1,LENGTH,WIDTH,HEIGHT);
+  dMassAdjust (&m,CMASS);
+  dBodySetMass (body[0],&m);
+  box[0] = dCreateBox (0,LENGTH,WIDTH,HEIGHT);
+  dGeomSetBody (box[0],body[0]);
+
+  // wheel bodies
+  for (i=1; i<=3; i++) {
+    body[i] = dBodyCreate (world);
+    dQuaternion q;
+    dQFromAxisAndAngle (q,1,0,0,M_PI*0.5);
+    dBodySetQuaternion (body[i],q);
+    dMassSetSphere (&m,1,RADIUS);
+    dMassAdjust (&m,WMASS);
+    dBodySetMass (body[i],&m);
+    sphere[i-1] = dCreateSphere (0,RADIUS);
+    dGeomSetBody (sphere[i-1],body[i]);
+  }
+  dBodySetPosition (body[1],0.5*LENGTH,0,STARTZ-HEIGHT*0.5);
+  dBodySetPosition (body[2],-0.5*LENGTH, WIDTH*0.5,STARTZ-HEIGHT*0.5);
+  dBodySetPosition (body[3],-0.5*LENGTH,-WIDTH*0.5,STARTZ-HEIGHT*0.5);
+
+  // front wheel hinge
+  /*
+  joint[0] = dJointCreateHinge2 (world,0);
+  dJointAttach (joint[0],body[0],body[1]);
+  const dReal *a = dBodyGetPosition (body[1]);
+  dJointSetHinge2Anchor (joint[0],a[0],a[1],a[2]);
+  dJointSetHinge2Axis1 (joint[0],0,0,1);
+  dJointSetHinge2Axis2 (joint[0],0,1,0);
+  */
+
+  // front and back wheel hinges
+  for (i=0; i<3; i++) {
+    joint[i] = dJointCreateHinge2 (world,0);
+    dJointAttach (joint[i],body[0],body[i+1]);
+    const dReal *a = dBodyGetPosition (body[i+1]);
+    dJointSetHinge2Anchor (joint[i],a[0],a[1],a[2]);
+    dJointSetHinge2Axis1 (joint[i],0,0,1);
+    dJointSetHinge2Axis2 (joint[i],0,1,0);
+  }
+
+  // set joint suspension
+  for (i=0; i<3; i++) {
+    dJointSetHinge2Param (joint[i],dParamSuspensionERP,0.4);
+    dJointSetHinge2Param (joint[i],dParamSuspensionCFM,0.8);
+  }
+
+  // lock back wheels along the steering axis
+  for (i=1; i<3; i++) {
+    // set stops to make sure wheels always stay in alignment
+    dJointSetHinge2Param (joint[i],dParamLoStop,0);
+    dJointSetHinge2Param (joint[i],dParamHiStop,0);
+    // the following alternative method is no good as the wheels may get out
+    // of alignment:
+    //   dJointSetHinge2Param (joint[i],dParamVel,0);
+    //   dJointSetHinge2Param (joint[i],dParamFMax,dInfinity);
+  }
+
+  // create car space and add it to the top level space
+  car_space = dSimpleSpaceCreate (space);
+  dSpaceSetCleanup (car_space,0);
+  dSpaceAdd (car_space,box[0]);
+  dSpaceAdd (car_space,sphere[0]);
+  dSpaceAdd (car_space,sphere[1]);
+  dSpaceAdd (car_space,sphere[2]);
+
+  // environment
+  ground_box = dCreateBox (space,2,1.5,1);
+  dMatrix3 R;
+  dRFromAxisAndAngle (R,0,1,0,-0.15);
+  dGeomSetPosition (ground_box,2,0,-0.34);
+  dGeomSetRotation (ground_box,R);
+
+  // run simulation
+  dsSimulationLoop (argc,argv,352,288,&fn);
+
+  dGeomDestroy (box[0]);
+  dGeomDestroy (sphere[0]);
+  dGeomDestroy (sphere[1]);
+  dGeomDestroy (sphere[2]);
+  dJointGroupDestroy (contactgroup);
+  dSpaceDestroy (space);
+  dWorldDestroy (world);
+  dCloseODE();
+  return 0;
+}