void command (int cmd)
{
// note: 0.0174532925 radians = 1 degree
dQuaternion q;
dMatrix3 m;
switch(cmd)
{
case 'w':
geom1pos[0]+=0.05;
break;
case 'a':
geom1pos[1]-=0.05;
break;
case 's':
geom1pos[0]-=0.05;
break;
case 'd':
geom1pos[1]+=0.05;
break;
case 'e':
geom1pos[2]-=0.05;
break;
case 'q':
geom1pos[2]+=0.05;
break;
case 'i':
dQFromAxisAndAngle (q, 0, 0, 1,0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
break;
case 'j':
dQFromAxisAndAngle (q, 1, 0, 0,0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
break;
case 'k':
dQFromAxisAndAngle (q, 0, 0, 1,-0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
break;
case 'l':
dQFromAxisAndAngle (q, 1, 0, 0,-0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
break;
case 'm':
(drawmode!=DS_POLYFILL)? drawmode=DS_POLYFILL:drawmode=DS_WIREFRAME;
break;
case 'n':
(geoms!=convex)? geoms=convex:geoms=boxes;
break;
default:
dsPrint ("received command %d (`%c')\n",cmd,cmd);
}
#if 0
dGeomSetPosition (geoms[1],
geom1pos[0],
geom1pos[1],
geom1pos[2]);
dQtoR (geom1quat, m);
dGeomSetRotation (geoms[1],m);
#endif
DumpInfo=true;
}
Kinematic PMoveable::odeToKinematic()
{
Kinematic k;
dQuaternion q_result, q_result1, q_base;
float norm;
const dReal *b_info;
const dReal *q_current = dBodyGetQuaternion(body);
q_base[0] = 0; q_base[1] = 0; q_base[2] = 0; q_base[3] = 1;
dQMultiply0(q_result1, q_current, q_base);
dQMultiply2(q_result, q_result1, q_current);
k.orientation_v = Vec3f(q_result[1], q_result[2], q_result[3]);
norm = sqrt(q_result[1] * q_result[1] + q_result[3] * q_result[3]);
if (norm == 0)
k.orientation = 0;
else
k.orientation = atan2(q_result[1] / norm, q_result[3] / norm);
b_info = dBodyGetPosition(body);
k.pos = Vec3f(b_info[0], b_info[1], b_info[2]);
b_info = dBodyGetLinearVel(body);
k.vel = Vec3f(b_info[0], b_info[1], b_info[2]);
return k;
}
void testQuaternionMultiply()
{
HEADER;
dMatrix3 RA,RB,RC,Rtest;
dQuaternion qa,qb,qc;
dReal diff,maxdiff=0;
for (int i=0; i<100; i++) {
makeRandomRotation (RB);
makeRandomRotation (RC);
dRtoQ (RB,qb);
dRtoQ (RC,qc);
dMultiply0 (RA,RB,RC,3,3,3);
dQMultiply0 (qa,qb,qc);
dQtoR (qa,Rtest);
diff = dMaxDifference (Rtest,RA,3,3);
if (diff > maxdiff) maxdiff = diff;
dMultiply1 (RA,RB,RC,3,3,3);
dQMultiply1 (qa,qb,qc);
dQtoR (qa,Rtest);
diff = dMaxDifference (Rtest,RA,3,3);
if (diff > maxdiff) maxdiff = diff;
dMultiply2 (RA,RB,RC,3,3,3);
dQMultiply2 (qa,qb,qc);
dQtoR (qa,Rtest);
diff = dMaxDifference (Rtest,RA,3,3);
if (diff > maxdiff) maxdiff = diff;
dMultiply0 (RA,RC,RB,3,3,3);
transpose3x3 (RA);
dQMultiply3 (qa,qb,qc);
dQtoR (qa,Rtest);
diff = dMaxDifference (Rtest,RA,3,3);
if (diff > maxdiff) maxdiff = diff;
}
printf ("\tmaximum difference = %e - %s\n",maxdiff,
(maxdiff > tol) ? "FAILED" : "passed");
}
void dxStepBody (dxBody *b, dReal h)
{
// cap the angular velocity
if (b->flags & dxBodyMaxAngularSpeed) {
const dReal max_ang_speed = b->max_angular_speed;
const dReal aspeed = dCalcVectorDot3( b->avel, b->avel );
if (aspeed > max_ang_speed*max_ang_speed) {
const dReal coef = max_ang_speed/dSqrt(aspeed);
dScaleVector3(b->avel, coef);
}
}
// end of angular velocity cap
// handle linear velocity
for (unsigned int j=0; j<3; j++) b->posr.pos[j] += h * b->lvel[j];
if (b->flags & dxBodyFlagFiniteRotation) {
dVector3 irv; // infitesimal rotation vector
dQuaternion q; // quaternion for finite rotation
if (b->flags & dxBodyFlagFiniteRotationAxis) {
// split the angular velocity vector into a component along the finite
// rotation axis, and a component orthogonal to it.
dVector3 frv; // finite rotation vector
dReal k = dCalcVectorDot3 (b->finite_rot_axis,b->avel);
frv[0] = b->finite_rot_axis[0] * k;
frv[1] = b->finite_rot_axis[1] * k;
frv[2] = b->finite_rot_axis[2] * k;
irv[0] = b->avel[0] - frv[0];
irv[1] = b->avel[1] - frv[1];
irv[2] = b->avel[2] - frv[2];
// make a rotation quaternion q that corresponds to frv * h.
// compare this with the full-finite-rotation case below.
h *= REAL(0.5);
dReal theta = k * h;
q[0] = dCos(theta);
dReal s = sinc(theta) * h;
q[1] = frv[0] * s;
q[2] = frv[1] * s;
q[3] = frv[2] * s;
}
else {
// make a rotation quaternion q that corresponds to w * h
dReal wlen = dSqrt (b->avel[0]*b->avel[0] + b->avel[1]*b->avel[1] +
b->avel[2]*b->avel[2]);
h *= REAL(0.5);
dReal theta = wlen * h;
q[0] = dCos(theta);
dReal s = sinc(theta) * h;
q[1] = b->avel[0] * s;
q[2] = b->avel[1] * s;
q[3] = b->avel[2] * s;
}
// do the finite rotation
dQuaternion q2;
dQMultiply0 (q2,q,b->q);
for (unsigned int j=0; j<4; j++) b->q[j] = q2[j];
// do the infitesimal rotation if required
if (b->flags & dxBodyFlagFiniteRotationAxis) {
dReal dq[4];
dWtoDQ (irv,b->q,dq);
for (unsigned int j=0; j<4; j++) b->q[j] += h * dq[j];
}
}
else {
// the normal way - do an infitesimal rotation
dReal dq[4];
dWtoDQ (b->avel,b->q,dq);
for (unsigned int j=0; j<4; j++) b->q[j] += h * dq[j];
}
// normalize the quaternion and convert it to a rotation matrix
dNormalize4 (b->q);
dQtoR (b->q,b->posr.R);
// notify all attached geoms that this body has moved
dxWorldProcessContext *world_process_context = b->world->UnsafeGetWorldProcessingContext();
for (dxGeom *geom = b->geom; geom; geom = dGeomGetBodyNext (geom)) {
world_process_context->LockForStepbodySerialization();
dGeomMoved (geom);
world_process_context->UnlockForStepbodySerialization();
}
// notify the user
if (b->moved_callback != NULL) {
b->moved_callback(b);
}
// damping
if (b->flags & dxBodyLinearDamping) {
const dReal lin_threshold = b->dampingp.linear_threshold;
const dReal lin_speed = dCalcVectorDot3( b->lvel, b->lvel );
if ( lin_speed > lin_threshold) {
const dReal k = 1 - b->dampingp.linear_scale;
dScaleVector3(b->lvel, k);
}
}
if (b->flags & dxBodyAngularDamping) {
const dReal ang_threshold = b->dampingp.angular_threshold;
const dReal ang_speed = dCalcVectorDot3( b->avel, b->avel );
if ( ang_speed > ang_threshold) {
const dReal k = 1 - b->dampingp.angular_scale;
dScaleVector3(b->avel, k);
}
}
}
void dxStepBody (dxBody *b, dReal h)
{
int j;
#ifdef DEBUG_VALID
dIASSERT(dValid(b->avel[0])&&dValid(b->avel[1])&&dValid(b->avel[2]));
#endif
// handle linear velocity
for (j=0; j<3; j++) b->pos[j] += h * b->lvel[j];
if (b->flags & dxBodyFlagFiniteRotation) {
dVector3 irv; // infitesimal rotation vector
dQuaternion q; // quaternion for finite rotation
if (b->flags & dxBodyFlagFiniteRotationAxis) {
// split the angular velocity vector into a component along the finite
// rotation axis, and a component orthogonal to it.
dVector3 frv; // finite rotation vector
dReal k = dDOT (b->finite_rot_axis,b->avel);
frv[0] = b->finite_rot_axis[0] * k;
frv[1] = b->finite_rot_axis[1] * k;
frv[2] = b->finite_rot_axis[2] * k;
irv[0] = b->avel[0] - frv[0];
irv[1] = b->avel[1] - frv[1];
irv[2] = b->avel[2] - frv[2];
// make a rotation quaternion q that corresponds to frv * h.
// compare this with the full-finite-rotation case below.
h *= REAL(0.5);
dReal theta = k * h;
q[0] = dCos(theta);
dReal s = sinc(theta) * h;
q[1] = frv[0] * s;
q[2] = frv[1] * s;
q[3] = frv[2] * s;
}
else {
// make a rotation quaternion q that corresponds to w * h
dReal wlen = dSqrt (b->avel[0]*b->avel[0] + b->avel[1]*b->avel[1] +
b->avel[2]*b->avel[2]);
h *= REAL(0.5);
dReal theta = wlen * h;
q[0] = dCos(theta);
dReal s = sinc(theta) * h;
q[1] = b->avel[0] * s;
q[2] = b->avel[1] * s;
q[3] = b->avel[2] * s;
}
// do the finite rotation
dQuaternion q2;
dQMultiply0 (q2,q,b->q);
for (j=0; j<4; j++) b->q[j] = q2[j];
// do the infitesimal rotation if required
if (b->flags & dxBodyFlagFiniteRotationAxis) {
dReal dq[4];
dWtoDQ (irv,b->q,dq);
for (j=0; j<4; j++) b->q[j] += h * dq[j];
}
}
else {
// the normal way - do an infitesimal rotation
dReal dq[4];
dWtoDQ (b->avel,b->q,dq);
for (j=0; j<4; j++) b->q[j] += h * dq[j];
}
// normalize the quaternion and convert it to a rotation matrix
dNormalize4 (b->q);
dQtoR (b->q,b->R);
// notify all attached geoms that this body has moved
for (dxGeom *geom = b->geom; geom; geom = dGeomGetBodyNext (geom))
dGeomMoved (geom);
#ifdef DEBUG_VALID
dIASSERT(dValid(b->avel[0])&&dValid(b->avel[1])&&dValid(b->avel[2]));
#endif
}
static inline void
moveAndRotateBody (dxBody * b, dReal h)
{
int j;
// handle linear velocity
for (j = 0; j < 3; j++)
b->posr.pos[j] += dMUL(h,b->lvel[j]);
if (b->flags & dxBodyFlagFiniteRotation)
{
dVector3 irv; // infitesimal rotation vector
dQuaternion q; // quaternion for finite rotation
if (b->flags & dxBodyFlagFiniteRotationAxis)
{
// split the angular velocity vector into a component along the finite
// rotation axis, and a component orthogonal to it.
dVector3 frv; // finite rotation vector
dReal k = dDOT (b->finite_rot_axis, b->avel);
frv[0] = dMUL(b->finite_rot_axis[0],k);
frv[1] = dMUL(b->finite_rot_axis[1],k);
frv[2] = dMUL(b->finite_rot_axis[2],k);
irv[0] = b->avel[0] - frv[0];
irv[1] = b->avel[1] - frv[1];
irv[2] = b->avel[2] - frv[2];
// make a rotation quaternion q that corresponds to frv * h.
// compare this with the full-finite-rotation case below.
h = dMUL(h,REAL (0.5));
dReal theta = dMUL(k,h);
q[0] = dCos (theta);
dReal s = dMUL(sinc (theta),h);
q[1] = dMUL(frv[0],s);
q[2] = dMUL(frv[1],s);
q[3] = dMUL(frv[2],s);
}
else
{
// make a rotation quaternion q that corresponds to w * h
dReal wlen = dSqrt (dMUL(b->avel[0],b->avel[0]) + dMUL(b->avel[1],b->avel[1]) + dMUL(b->avel[2],b->avel[2]));
h = dMUL(h,REAL (0.5));
dReal theta = dMUL(wlen,h);
q[0] = dCos (theta);
dReal s = dMUL(sinc (theta),h);
q[1] = dMUL(b->avel[0],s);
q[2] = dMUL(b->avel[1],s);
q[3] = dMUL(b->avel[2],s);
}
// do the finite rotation
dQuaternion q2;
dQMultiply0 (q2, q, b->q);
for (j = 0; j < 4; j++)
b->q[j] = q2[j];
// do the infitesimal rotation if required
if (b->flags & dxBodyFlagFiniteRotationAxis)
{
dReal dq[4];
dWtoDQ (irv, b->q, dq);
for (j = 0; j < 4; j++)
b->q[j] += dMUL(h,dq[j]);
}
}
else
{
// the normal way - do an infitesimal rotation
dReal dq[4];
dWtoDQ (b->avel, b->q, dq);
for (j = 0; j < 4; j++)
b->q[j] += dMUL(h,dq[j]);
}
// normalize the quaternion and convert it to a rotation matrix
dNormalize4 (b->q);
dQtoR (b->q, b->posr.R);
// notify all attached geoms that this body has moved
for (dxGeom * geom = b->geom; geom; geom = dGeomGetBodyNext (geom))
dGeomMoved (geom);
}
void
dxJointUniversal::getAngles( dReal *angle1, dReal *angle2 )
{
if ( node[0].body )
{
// length 1 joint axis in global coordinates, from each body
dVector3 ax1, ax2;
dMatrix3 R;
dQuaternion qcross, qq, qrel;
getAxes( ax1, ax2 );
// It should be possible to get both angles without explicitly
// constructing the rotation matrix of the cross. Basically,
// orientation of the cross about axis1 comes from body 2,
// about axis 2 comes from body 1, and the perpendicular
// axis can come from the two bodies somehow. (We don't really
// want to assume it's 90 degrees, because in general the
// constraints won't be perfectly satisfied, or even very well
// satisfied.)
//
// However, we'd need a version of getHingeAngleFromRElativeQuat()
// that CAN handle when its relative quat is rotated along a direction
// other than the given axis. What I have here works,
// although it's probably much slower than need be.
dRFrom2Axes( R, ax1[0], ax1[1], ax1[2], ax2[0], ax2[1], ax2[2] );
dRtoQ( R, qcross );
// This code is essentialy the same as getHingeAngle(), see the comments
// there for details.
// get qrel = relative rotation between node[0] and the cross
dQMultiply1( qq, node[0].body->q, qcross );
dQMultiply2( qrel, qq, qrel1 );
*angle1 = getHingeAngleFromRelativeQuat( qrel, axis1 );
// This is equivalent to
// dRFrom2Axes(R, ax2[0], ax2[1], ax2[2], ax1[0], ax1[1], ax1[2]);
// You see that the R is constructed from the same 2 axis as for angle1
// but the first and second axis are swapped.
// So we can take the first R and rapply a rotation to it.
// The rotation is around the axis between the 2 axes (ax1 and ax2).
// We do a rotation of 180deg.
dQuaternion qcross2;
// Find the vector between ax1 and ax2 (i.e. in the middle)
// We need to turn around this vector by 180deg
// The 2 axes should be normalize so to find the vector between the 2.
// Add and devide by 2 then normalize or simply normalize
// ax2
// ^
// |
// |
/// *------------> ax1
// We want the vector a 45deg
//
// N.B. We don't need to normalize the ax1 and ax2 since there are
// normalized when we set them.
// We set the quaternion q = [cos(theta), dir*sin(theta)] = [w, x, y, Z]
qrel[0] = 0; // equivalent to cos(Pi/2)
qrel[1] = ax1[0] + ax2[0]; // equivalent to x*sin(Pi/2); since sin(Pi/2) = 1
qrel[2] = ax1[1] + ax2[1];
qrel[3] = ax1[2] + ax2[2];
dReal l = dRecip( sqrt( qrel[1] * qrel[1] + qrel[2] * qrel[2] + qrel[3] * qrel[3] ) );
qrel[1] *= l;
qrel[2] *= l;
qrel[3] *= l;
dQMultiply0( qcross2, qrel, qcross );
if ( node[1].body )
{
dQMultiply1( qq, node[1].body->q, qcross2 );
dQMultiply2( qrel, qq, qrel2 );
}
else
{
// pretend joint->node[1].body->q is the identity
dQMultiply2( qrel, qcross2, qrel2 );
}
*angle2 = - getHingeAngleFromRelativeQuat( qrel, axis2 );
}
else
{
*angle1 = 0;
*angle2 = 0;
}
}
void dJointSetUniversalAxis2Offset( dJointID j, dReal x, dReal y, dReal z,
dReal offset1, dReal offset2 )
{
dxJointUniversal* joint = ( dxJointUniversal* )j;
dUASSERT( joint, "bad joint argument" );
checktype( joint, Universal );
if ( joint->flags & dJOINT_REVERSE )
{
setAxes( joint, x, y, z, joint->axis1, NULL );
offset1 = -offset2;
offset2 = -offset1;
}
else
setAxes( joint, x, y, z, NULL, joint->axis2 );
joint->computeInitialRelativeRotations();
// It is easier to retreive the 2 axes here since
// when there is only one body B2 (the axes switch position)
// Doing this way eliminate the need to write the code differently
// for both case.
dVector3 ax1, ax2;
joint->getAxes(ax1, ax2 );
dQuaternion qAngle;
dQFromAxisAndAngle(qAngle, ax1[0], ax1[1], ax1[2], offset1);
dMatrix3 R;
dRFrom2Axes( R, ax1[0], ax1[1], ax1[2], ax2[0], ax2[1], ax2[2]);
dQuaternion qcross;
dRtoQ( R, qcross );
dQuaternion qOffset;
dQMultiply0(qOffset, qAngle, qcross);
dQMultiply1( joint->qrel1, joint->node[0].body->q, qOffset );
// Calculating the second offset
dQFromAxisAndAngle(qAngle, ax2[0], ax2[1], ax2[2], offset2);
dRFrom2Axes( R, ax2[0], ax2[1], ax2[2], ax1[0], ax1[1], ax1[2]);
dRtoQ( R, qcross );
dQMultiply1(qOffset, qAngle, qcross);
if ( joint->node[1].body )
{
dQMultiply1( joint->qrel2, joint->node[1].body->q, qOffset );
}
else
{
joint->qrel2[0] = qcross[0];
joint->qrel2[1] = qcross[1];
joint->qrel2[2] = qcross[2];
joint->qrel2[3] = qcross[3];
}
}
void dJointSetUniversalAxis1Offset( dJointID j, dReal x, dReal y, dReal z,
dReal offset1, dReal offset2 )
{
dxJointUniversal* joint = ( dxJointUniversal* )j;
dUASSERT( joint, "bad joint argument" );
checktype( joint, Universal );
if ( joint->flags & dJOINT_REVERSE )
{
setAxes( joint, x, y, z, NULL, joint->axis2 );
offset1 = -offset1;
offset2 = -offset2;
}
else
setAxes( joint, x, y, z, joint->axis1, NULL );
joint->computeInitialRelativeRotations();
dVector3 ax2;
getAxis2( joint, ax2, joint->axis2 );
{
dVector3 ax1;
joint->getAxes(ax1, ax2);
}
dQuaternion qAngle;
dQFromAxisAndAngle(qAngle, x, y, z, offset1);
dMatrix3 R;
dRFrom2Axes( R, x, y, z, ax2[0], ax2[1], ax2[2] );
dQuaternion qcross;
dRtoQ( R, qcross );
dQuaternion qOffset;
dQMultiply0(qOffset, qAngle, qcross);
dQMultiply1( joint->qrel1, joint->node[0].body->q, qOffset );
// Calculating the second offset
dQFromAxisAndAngle(qAngle, ax2[0], ax2[1], ax2[2], offset2);
dRFrom2Axes( R, ax2[0], ax2[1], ax2[2], x, y, z );
dRtoQ( R, qcross );
dQMultiply1(qOffset, qAngle, qcross);
if ( joint->node[1].body )
{
dQMultiply1( joint->qrel2, joint->node[1].body->q, qOffset );
}
else
{
joint->qrel2[0] = qcross[0];
joint->qrel2[1] = qcross[1];
joint->qrel2[2] = qcross[2];
joint->qrel2[3] = qcross[3];
}
}
void command (int cmd)
{
// note: 0.0174532925 radians = 1 degree
dQuaternion q;
dMatrix3 m;
bool changed = false;
switch(cmd)
{
case 'w':
geom1pos[0]+=0.05;
changed = true;
break;
case 'a':
geom1pos[1]-=0.05;
changed = true;
break;
case 's':
geom1pos[0]-=0.05;
changed = true;
break;
case 'd':
geom1pos[1]+=0.05;
changed = true;
break;
case 'e':
geom1pos[2]-=0.05;
changed = true;
break;
case 'q':
geom1pos[2]+=0.05;
changed = true;
break;
case 'i':
dQFromAxisAndAngle (q, 0, 0, 1,0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
changed = true;
break;
case 'j':
dQFromAxisAndAngle (q, 1, 0, 0,0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
changed = true;
break;
case 'k':
dQFromAxisAndAngle (q, 0, 0, 1,-0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
changed = true;
break;
case 'l':
dQFromAxisAndAngle (q, 1, 0, 0,-0.0174532925);
dQMultiply0(geom1quat,geom1quat,q);
changed = true;
break;
case 'm':
(drawmode!=DS_POLYFILL)? drawmode=DS_POLYFILL:drawmode=DS_WIREFRAME;
break;
case 'n':
(geoms!=convex)? geoms=convex:geoms=boxes;
if(geoms==convex)
{
printf("CONVEX------------------------------------------------------>\n");
}
else
{
printf("BOX--------------------------------------------------------->\n");
}
break;
default:
dsPrint ("received command %d (`%c')\n",cmd,cmd);
}
#if 0
dGeomSetPosition (geoms[1],
geom1pos[0],
geom1pos[1],
geom1pos[2]);
dQtoR (geom1quat, m);
dGeomSetRotation(geoms[1],m);
if(changed)
{
printf("POS: %f,%f,%f\n",geom1pos[0],geom1pos[1],geom1pos[2]);
printf("ROT:\n%f,%f,%f,%f\n%f,%f,%f,%f\n%f,%f,%f,%f\n",
m[0],m[1],m[2],m[3],
m[4],m[5],m[6],m[7],
m[8],m[9],m[10],m[11]);
}
#endif
DumpInfo=true;
}