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scummvm-cursorfix/engines/hpl1/engine/libraries/newton/physics/dgBilateralConstraint.cpp
Leon Krieg 5b11698731 Initial commit
2026-02-02 04:50:13 +01:00

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/* Copyright (c) <2003-2011> <Julio Jerez, Newton Game Dynamics>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "dgBody.h"
#include "hpl1/engine/libraries/newton/core/dg.h"
#include "dgBilateralConstraint.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
#define DG_JOINT_STIFFNESS_RANGE (dgFloat32(5.0f))
#define DG_VEL_DAMP (dgFloat32(100.0f))
#define DG_POS_DAMP (dgFloat32(1500.0f))
dgBilateralConstraint::dgBilateralConstraint() : dgConstraint() {
NEWTON_ASSERT((sizeof(dgBilateralConstraint) & 15) == 0);
NEWTON_ASSERT((((dgUnsigned64)&m_localMatrix0) & 15) == 0);
// dgConstraint::Init ();
m_maxDOF = 6;
m_destructor = NULL;
m_localMatrix0 = dgGetIdentityMatrix();
m_localMatrix1 = dgGetIdentityMatrix();
// SetStiffness (90.0f/99.0f);
SetStiffness(dgFloat32(0.9f));
memset(m_jointForce, 0, sizeof(m_jointForce));
memset(m_rowIsMotor, 0, sizeof(m_rowIsMotor));
memset(m_motorAcceleration, 0, sizeof(m_motorAcceleration));
}
dgBilateralConstraint::~dgBilateralConstraint() {
if (m_destructor) {
m_destructor(reinterpret_cast<NewtonJoint *>(this));
}
}
bool dgBilateralConstraint::IsBilateral() const {
return true;
}
dgFloat32 dgBilateralConstraint::GetStiffness() const {
return (DG_JOINT_STIFFNESS_RANGE - m_stiffness) / (DG_JOINT_STIFFNESS_RANGE - dgFloat32(1.0f));
}
void dgBilateralConstraint::SetStiffness(dgFloat32 stiffness) {
stiffness = ClampValue(stiffness, dgFloat32(0.0f), dgFloat32(1.0f));
m_stiffness = DG_JOINT_STIFFNESS_RANGE - stiffness * (DG_JOINT_STIFFNESS_RANGE - dgFloat32(1.0f));
}
void dgBilateralConstraint::SetDestructorCallback(
OnConstraintDestroy destructor) {
m_destructor = destructor;
}
void dgBilateralConstraint::CalculateMatrixOffset(const dgVector &pivot,
const dgVector &dir, dgMatrix &matrix0, dgMatrix &matrix1) {
dgFloat32 length;
NEWTON_ASSERT(m_body0);
NEWTON_ASSERT(m_body1);
const dgMatrix &body0_Matrix = m_body0->GetMatrix();
length = dir % dir;
length = dgSqrt(length);
NEWTON_ASSERT(length > dgFloat32(0.0f));
// matrix0.m_front = body0_Matrix.UnrotateVector (dir.Scale (dgFloat32 (1.0f) / length));
// Create__Basis (matrix0.m_front, matrix0.m_up, matrix0.m_right);
matrix0 = dgMatrix(
body0_Matrix.UnrotateVector(dir.Scale(dgFloat32(1.0f) / length)));
matrix0.m_posit = body0_Matrix.UntransformVector(pivot);
matrix0.m_front.m_w = dgFloat32(0.0f);
matrix0.m_up.m_w = dgFloat32(0.0f);
matrix0.m_right.m_w = dgFloat32(0.0f);
matrix0.m_posit.m_w = dgFloat32(1.0f);
// dgMatrix body1_Matrix (dgGetIdentityMatrix());
// if (m_body1) {
// body1_Matrix = m_body1->GetMatrix();
// }
const dgMatrix &body1_Matrix = m_body1->GetMatrix();
matrix1 = matrix0 * body0_Matrix * body1_Matrix.Inverse();
}
void dgBilateralConstraint::SetPivotAndPinDir(const dgVector &pivot,
const dgVector &pinDirection) {
CalculateMatrixOffset(pivot, pinDirection, m_localMatrix0, m_localMatrix1);
}
void dgBilateralConstraint::SetPivotAndPinDir(const dgVector &pivot,
const dgVector &pinDirection0, const dgVector &pinDirection1) {
NEWTON_ASSERT(m_body0);
NEWTON_ASSERT(m_body1);
const dgMatrix &body0_Matrix = m_body0->GetMatrix();
NEWTON_ASSERT((pinDirection0 % pinDirection0) > dgFloat32(0.0f));
m_localMatrix0.m_front = pinDirection0.Scale(
dgFloat32(1.0f) / dgSqrt(pinDirection0 % pinDirection0));
m_localMatrix0.m_right = m_localMatrix0.m_front * pinDirection1;
m_localMatrix0.m_right =
m_localMatrix0.m_right.Scale(
dgFloat32(
1.0f) /
dgSqrt(m_localMatrix0.m_right % m_localMatrix0.m_right));
m_localMatrix0.m_up = m_localMatrix0.m_right * m_localMatrix0.m_front;
m_localMatrix0.m_posit = pivot;
m_localMatrix0.m_front.m_w = dgFloat32(0.0f);
m_localMatrix0.m_up.m_w = dgFloat32(0.0f);
m_localMatrix0.m_right.m_w = dgFloat32(0.0f);
m_localMatrix0.m_posit.m_w = dgFloat32(1.0f);
// dgMatrix body1_Matrix (dgGetIdentityMatrix());
// if (m_body1) {
// body1_Matrix = m_body1->GetMatrix();
// }
const dgMatrix &body1_Matrix = m_body1->GetMatrix();
m_localMatrix1 = m_localMatrix0 * body1_Matrix.Inverse();
m_localMatrix0 = m_localMatrix0 * body0_Matrix.Inverse();
}
dgVector dgBilateralConstraint::CalculateGlobalMatrixAndAngle(
dgMatrix &globalMatrix0, dgMatrix &globalMatrix1) const {
NEWTON_ASSERT(m_body0);
NEWTON_ASSERT(m_body1);
const dgMatrix &body0Matrix = m_body0->GetMatrix();
const dgMatrix &body1Matrix = m_body1->GetMatrix();
// dgMatrix body1Matrix (dgGetIdentityMatrix());
// if (m_body1) {
// body1Matrix = m_body1->GetMatrix();
// }
globalMatrix0 = m_localMatrix0 * body0Matrix;
globalMatrix1 = m_localMatrix1 * body1Matrix;
dgMatrix relMatrix(globalMatrix1 * globalMatrix0.Inverse());
NEWTON_ASSERT(
dgAbsf(dgFloat32(1.0f) - (relMatrix.m_front % relMatrix.m_front)) < 1.0e-5f);
NEWTON_ASSERT(
dgAbsf(dgFloat32(1.0f) - (relMatrix.m_up % relMatrix.m_up)) < 1.0e-5f);
NEWTON_ASSERT(
dgAbsf(dgFloat32(1.0f) - (relMatrix.m_right % relMatrix.m_right)) < 1.0e-5f);
// NEWTON_ASSERT ((relMatrix.m_posit % relMatrix.m_posit) < 1.0e-3f);
return relMatrix.CalcPitchYawRoll();
}
void dgBilateralConstraint::SetMotorAcceleration(dgInt32 index,
dgFloat32 acceleration, dgContraintDescritor &desc) {
m_rowIsMotor[index] = -1;
m_motorAcceleration[index] = acceleration;
desc.m_isMotor[index] = 1;
desc.m_jointAccel[index] = acceleration;
}
void dgBilateralConstraint::SetJacobianDerivative(dgInt32 index,
dgContraintDescritor &desc, const dgFloat32 *jacobianA,
const dgFloat32 *jacobianB, dgFloat32 *jointForce) {
dgJacobian &jacobian0 = desc.m_jacobian[index].m_jacobian_IM0;
dgJacobian &jacobian1 = desc.m_jacobian[index].m_jacobian_IM1;
jacobian0.m_linear[0] = jacobianA[0];
jacobian0.m_linear[1] = jacobianA[1];
jacobian0.m_linear[2] = jacobianA[2];
jacobian0.m_linear[3] = dgFloat32(0.0f);
jacobian0.m_angular[0] = jacobianA[3];
jacobian0.m_angular[1] = jacobianA[4];
jacobian0.m_angular[2] = jacobianA[5];
jacobian0.m_angular[3] = dgFloat32(0.0f);
jacobian1.m_linear[0] = jacobianB[0];
jacobian1.m_linear[1] = jacobianB[1];
jacobian1.m_linear[2] = jacobianB[2];
jacobian1.m_linear[3] = dgFloat32(0.0f);
jacobian1.m_angular[0] = jacobianB[3];
jacobian1.m_angular[1] = jacobianB[4];
jacobian1.m_angular[2] = jacobianB[5];
jacobian1.m_angular[3] = dgFloat32(0.0f);
m_rowIsMotor[index] = -1;
m_motorAcceleration[index] = dgFloat32(0.0f);
desc.m_restitution[index] = dgFloat32(0.0f);
desc.m_jointAccel[index] = dgFloat32(0.0f);
desc.m_penetration[index] = dgFloat32(0.0f);
desc.m_penetrationStiffness[index] = dgFloat32(0.0f);
desc.m_jointStiffness[index] = dgFloat32(1.0f);
desc.m_forceBounds[index].m_jointForce = jointForce;
}
dgFloat32 dgBilateralConstraint::CalculateSpringDamperAcceleration(
dgInt32 index, const dgContraintDescritor &desc, dgFloat32 jointAngle,
const dgVector &p0Global, const dgVector &p1Global, dgFloat32 springK,
dgFloat32 springD) {
dgFloat32 relPosit;
dgFloat32 relVeloc;
const dgJacobian &jacobian0 = desc.m_jacobian[index].m_jacobian_IM0;
const dgJacobian &jacobian1 = desc.m_jacobian[index].m_jacobian_IM1;
dgVector veloc0(m_body0->m_veloc);
dgVector omega0(m_body0->m_omega);
dgVector veloc1(dgFloat32(0.0f), dgFloat32(0.0f), dgFloat32(0.0f),
dgFloat32(0.0f));
dgVector omega1(dgFloat32(0.0f), dgFloat32(0.0f), dgFloat32(0.0f),
dgFloat32(0.0f));
;
if (m_body1) {
veloc1 = m_body1->m_veloc;
omega1 = m_body1->m_omega;
}
relPosit = (p1Global - p0Global) % jacobian0.m_linear + jointAngle;
relVeloc = -(veloc0 % jacobian0.m_linear + veloc1 % jacobian1.m_linear + omega0 % jacobian0.m_angular + omega1 % jacobian1.m_angular);
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
dgFloat32 dt = desc.m_timestep;
dgFloat32 ks = springK;
dgFloat32 kd = springD;
dgFloat32 ksd = dt * ks;
dgFloat32 num = ks * relPosit + kd * relVeloc + ksd * relVeloc;
dgFloat32 den = dgFloat32(1.0f) + dt * kd + dt * ksd;
return num / den;
}
void dgBilateralConstraint::CalculateAngularDerivative(dgInt32 index,
dgContraintDescritor &desc, const dgVector &dir, dgFloat32 stiffness,
dgFloat32 jointAngle, dgFloat32 *jointForce) {
dgFloat32 alphaError;
dgFloat32 omegaError;
NEWTON_ASSERT(jointForce);
dgVector omega1;
NEWTON_ASSERT(m_body0);
dgVector omega0(m_body0->GetOmega());
dgJacobian &jacobian0 = desc.m_jacobian[index].m_jacobian_IM0;
jacobian0.m_linear[0] = dgFloat32(0.0f);
jacobian0.m_linear[1] = dgFloat32(0.0f);
jacobian0.m_linear[2] = dgFloat32(0.0f);
jacobian0.m_linear[3] = dgFloat32(0.0f);
jacobian0.m_angular[0] = dir.m_x;
jacobian0.m_angular[1] = dir.m_y;
jacobian0.m_angular[2] = dir.m_z;
jacobian0.m_angular[3] = dgFloat32(0.0f);
dgJacobian &jacobian1 = desc.m_jacobian[index].m_jacobian_IM1;
NEWTON_ASSERT(m_body1);
omega1 = m_body1->GetOmega();
jacobian1.m_linear[0] = dgFloat32(0.0f);
jacobian1.m_linear[1] = dgFloat32(0.0f);
jacobian1.m_linear[2] = dgFloat32(0.0f);
jacobian1.m_linear[3] = dgFloat32(0.0f);
jacobian1.m_angular[0] = -dir.m_x;
jacobian1.m_angular[1] = -dir.m_y;
jacobian1.m_angular[2] = -dir.m_z;
jacobian1.m_angular[3] = dgFloat32(0.0f);
omegaError = (omega1 - omega0) % dir;
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
dgFloat32 dt = desc.m_timestep;
dgFloat32 ks = DG_POS_DAMP;
dgFloat32 kd = DG_VEL_DAMP;
dgFloat32 ksd = dt * ks;
dgFloat32 num = ks * jointAngle + kd * omegaError + ksd * omegaError;
dgFloat32 den = dgFloat32(1.0f) + dt * kd + dt * ksd;
alphaError = num / den;
m_rowIsMotor[index] = 0;
desc.m_isMotor[index] = 0;
m_motorAcceleration[index] = dgFloat32(0.0f);
//NEWTON_ASSERT (dgAbsf (alphaError - CalculateSpringDamperAcceleration (index, desc, jointAngle, dgVector (0, 0, 0), dgVector (0, 0, 0), ANGULAR_POS_DAMP, ANGULAR_VEL_DAMP)) < 1.0e-2f);
desc.m_penetration[index] = jointAngle;
desc.m_jointAccel[index] = alphaError;
desc.m_restitution[index] = dgFloat32(0.0f);
desc.m_jointStiffness[index] = stiffness;
desc.m_penetrationStiffness[index] = dgFloat32(0.0f);
desc.m_forceBounds[index].m_jointForce = jointForce;
}
void dgBilateralConstraint::CalculatePointDerivative(dgInt32 index,
dgContraintDescritor &desc, const dgVector &dir, const dgPointParam &param,
dgFloat32 *jointForce) {
dgFloat32 relPosit;
dgFloat32 relVeloc;
dgFloat32 relCentr;
dgFloat32 accelError;
NEWTON_ASSERT(jointForce);
NEWTON_ASSERT(m_body0);
NEWTON_ASSERT(m_body1);
dgJacobian &jacobian0 = desc.m_jacobian[index].m_jacobian_IM0;
dgVector r0CrossDir(param.m_r0 * dir);
jacobian0.m_linear[0] = dir.m_x;
jacobian0.m_linear[1] = dir.m_y;
jacobian0.m_linear[2] = dir.m_z;
jacobian0.m_linear[3] = dgFloat32(0.0f);
jacobian0.m_angular[0] = r0CrossDir.m_x;
jacobian0.m_angular[1] = r0CrossDir.m_y;
jacobian0.m_angular[2] = r0CrossDir.m_z;
jacobian0.m_angular[3] = dgFloat32(0.0f);
dgJacobian &jacobian1 = desc.m_jacobian[index].m_jacobian_IM1;
dgVector r1CrossDir(dir * param.m_r1);
jacobian1.m_linear[0] = -dir.m_x;
jacobian1.m_linear[1] = -dir.m_y;
jacobian1.m_linear[2] = -dir.m_z;
jacobian1.m_linear[3] = dgFloat32(0.0f);
jacobian1.m_angular[0] = r1CrossDir.m_x;
jacobian1.m_angular[1] = r1CrossDir.m_y;
jacobian1.m_angular[2] = r1CrossDir.m_z;
jacobian1.m_angular[3] = dgFloat32(0.0f);
dgVector velocError(param.m_veloc1 - param.m_veloc0);
dgVector positError(param.m_posit1 - param.m_posit0);
dgVector centrError(param.m_centripetal1 - param.m_centripetal0);
relPosit = positError % dir;
relVeloc = velocError % dir;
relCentr = centrError % dir;
relCentr = ClampValue(relCentr, dgFloat32(-10000.0f), dgFloat32(10000.0f));
// relCentr = 0.0f;
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
dgFloat32 dt = desc.m_timestep;
dgFloat32 ks = DG_POS_DAMP;
dgFloat32 kd = DG_VEL_DAMP;
dgFloat32 ksd = dt * ks;
dgFloat32 num = ks * relPosit + kd * relVeloc + ksd * relVeloc;
dgFloat32 den = dgFloat32(1.0f) + dt * kd + dt * ksd;
accelError = num / den;
//NEWTON_ASSERT (dgAbsf (accelError - CalculateSpringDamperAcceleration (index, desc, 0.0f, param.m_posit0, param.m_posit1, LINEAR_POS_DAMP, LINEAR_VEL_DAMP)) < 1.0e-2f);
m_rowIsMotor[index] = 0;
desc.m_isMotor[index] = 0;
m_motorAcceleration[index] = dgFloat32(0.0f);
// dgJacobianPair m_jacobian[DG_CONSTRAINT_MAX_ROWS];
// dgBilateralBounds m_forceBounds[DG_CONSTRAINT_MAX_ROWS];
// dgFloat32 m_jointAccel[DG_CONSTRAINT_MAX_ROWS];
// dgFloat32 m_jointStiffness[DG_CONSTRAINT_MAX_ROWS];
// dgFloat32 m_restitution[DG_CONSTRAINT_MAX_ROWS];
// dgFloat32 m_penetration[DG_CONSTRAINT_MAX_ROWS];
// dgFloat32 m_penetrationStiffness[DG_CONSTRAINT_MAX_ROWS];
desc.m_penetration[index] = relPosit;
desc.m_penetrationStiffness[index] = dgFloat32(0.01f / 4.0f);
desc.m_jointStiffness[index] = param.m_stiffness;
desc.m_jointAccel[index] = accelError + relCentr;
// save centripetal acceleration in the restitution member
desc.m_restitution[index] = relCentr;
desc.m_forceBounds[index].m_jointForce = jointForce;
}
void dgBilateralConstraint::JointAccelerationsSimd(
const dgJointAccelerationDecriptor &params) {
#ifdef DG_BUILD_SIMD_CODE
dgFloat32 dt;
const dgJacobianPair *const Jt = params.m_Jt;
const dgVector &bodyVeloc0 = m_body0->m_veloc;
const dgVector &bodyOmega0 = m_body0->m_omega;
const dgVector &bodyVeloc1 = m_body1->m_veloc;
const dgVector &bodyOmega1 = m_body1->m_omega;
#if 1
dgFloat32 kd = DG_VEL_DAMP * dgFloat32(4.0f);
dgFloat32 ks = DG_POS_DAMP * dgFloat32(0.25f);
dt = params.m_timeStep;
for (dgInt32 k = 0; k < params.m_rowsCount; k++) {
if (m_rowIsMotor[k]) {
params.m_coordenateAccel[k] = m_motorAcceleration[k] + params.m_externAccelaration[k];
} else {
dgFloat32 num;
dgFloat32 den;
dgFloat32 ksd;
dgFloat32 vRel;
dgFloat32 aRel;
dgFloat32 aRelErr;
dgFloat32 relPosit;
dgVector relVeloc(Jt[k].m_jacobian_IM0.m_linear.CompProduct(bodyVeloc0));
relVeloc += Jt[k].m_jacobian_IM0.m_angular.CompProduct(bodyOmega0);
relVeloc += Jt[k].m_jacobian_IM1.m_linear.CompProduct(bodyVeloc1);
relVeloc += Jt[k].m_jacobian_IM1.m_angular.CompProduct(bodyOmega1);
vRel = relVeloc.m_x + relVeloc.m_y + relVeloc.m_z;
aRel = params.m_externAccelaration[k];
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
// alphaError = num / den;
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
// dgFloat32 dt = desc.m_timestep;
// dgFloat32 ks = DG_POS_DAMP;
// dgFloat32 kd = DG_VEL_DAMP;
// dgFloat32 ksd = dt * ks;
// dgFloat32 num = ks * relPosit + kd * relVeloc + ksd * relVeloc;
// dgFloat32 den = dgFloat32 (1.0f) + dt * kd + dt * ksd;
// accelError = num / den;
ksd = dt * ks;
// relPosit = params.m_penetration[k];
relPosit = params.m_penetration[k] - vRel * dt * params.m_firstPassCoefFlag;
// if (relPosit > dgFloat32 (1.0f) ) {
// relPosit = dgFloat32 (1.0f);
// } else if (params.m_penetration[k] < dgFloat32 (-1.0f) ) {
// relPosit = dgFloat32 (-1.0f);
// }
params.m_penetration[k] = relPosit;
num = ks * relPosit - kd * vRel - ksd * vRel;
den = dgFloat32(1.0f) + dt * kd + dt * ksd;
aRelErr = num / den;
// centripetal acceleration is stored restitution member
params.m_coordenateAccel[k] = aRelErr + params.m_restitution[k] + aRel;
#else
dgFloat32 vRel;
dgFloat32 aRel;
dgFloat32 penetrationVeloc;
dgFloat32 penetrationCorrection;
dgVector relVeloc(Jt[k].m_jacobian_IM0.m_linear.CompProduct(bodyVeloc0));
relVeloc += Jt[k].m_jacobian_IM0.m_angular.CompProduct(bodyOmega0);
relVeloc += Jt[k].m_jacobian_IM1.m_linear.CompProduct(bodyVeloc1);
relVeloc += Jt[k].m_jacobian_IM1.m_angular.CompProduct(bodyOmega1);
vRel = relVeloc.m_x + relVeloc.m_y + relVeloc.m_z;
penetrationCorrection = vRel * params.m_timeStep * params.m_firstPassCoefFlag;
params.m_penetration[k] = params.m_penetration[k] - penetrationCorrection;
if (params.m_penetration[k] > dgFloat32(1.0f)) {
params.m_penetration[k] = dgFloat32(1.0f);
} else if (params.m_penetration[k] < dgFloat32(-1.0f)) {
params.m_penetration[k] = dgFloat32(-1.0f);
}
penetrationVeloc = -(params.m_penetration[k] * params.m_penetrationStiffness[k] * params.m_invTimeStep);
vRel += penetrationVeloc;
// centripetal acceleration is stored restitution member
aRel = params.m_externAccelaration[k] + params.m_restitution[k];
params.m_coordenateAccel[k] = (aRel - vRel * params.m_invTimeStep);
#endif
}
}
#endif
}
void dgBilateralConstraint::JointAccelerations(
const dgJointAccelerationDecriptor &params) {
dgFloat32 dt;
const dgJacobianPair *const Jt = params.m_Jt;
const dgVector &bodyVeloc0 = m_body0->m_veloc;
const dgVector &bodyOmega0 = m_body0->m_omega;
const dgVector &bodyVeloc1 = m_body1->m_veloc;
const dgVector &bodyOmega1 = m_body1->m_omega;
#if 1
dgFloat32 kd = DG_VEL_DAMP * dgFloat32(4.0f);
dgFloat32 ks = DG_POS_DAMP * dgFloat32(0.25f);
dt = params.m_timeStep;
for (dgInt32 k = 0; k < params.m_rowsCount; k++) {
if (m_rowIsMotor[k]) {
params.m_coordenateAccel[k] = m_motorAcceleration[k] + params.m_externAccelaration[k];
} else {
dgFloat32 num;
dgFloat32 den;
dgFloat32 ksd;
dgFloat32 vRel;
dgFloat32 aRel;
dgFloat32 aRelErr;
dgFloat32 relPosit;
dgVector relVeloc(Jt[k].m_jacobian_IM0.m_linear.CompProduct(bodyVeloc0));
relVeloc += Jt[k].m_jacobian_IM0.m_angular.CompProduct(bodyOmega0);
relVeloc += Jt[k].m_jacobian_IM1.m_linear.CompProduct(bodyVeloc1);
relVeloc += Jt[k].m_jacobian_IM1.m_angular.CompProduct(bodyOmega1);
vRel = relVeloc.m_x + relVeloc.m_y + relVeloc.m_z;
aRel = params.m_externAccelaration[k];
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
// alphaError = num / den;
// at = [- ks (x2 - x1) - kd * (v2 - v1) - dt * ks * (v2 - v1)] / [1 + dt * kd + dt * dt * ks]
// dgFloat32 dt = desc.m_timestep;
// dgFloat32 ks = DG_POS_DAMP;
// dgFloat32 kd = DG_VEL_DAMP;
// dgFloat32 ksd = dt * ks;
// dgFloat32 num = ks * relPosit + kd * relVeloc + ksd * relVeloc;
// dgFloat32 den = dgFloat32 (1.0f) + dt * kd + dt * ksd;
// accelError = num / den;
ksd = dt * ks;
// relPosit = params.m_penetration[k];
relPosit = params.m_penetration[k] - vRel * dt * params.m_firstPassCoefFlag;
// if (relPosit > dgFloat32 (1.0f) ) {
// relPosit = dgFloat32 (1.0f);
// } else if (params.m_penetration[k] < dgFloat32 (-1.0f) ) {
// relPosit = dgFloat32 (-1.0f);
// }
params.m_penetration[k] = relPosit;
num = ks * relPosit - kd * vRel - ksd * vRel;
den = dgFloat32(1.0f) + dt * kd + dt * ksd;
aRelErr = num / den;
// centripetal acceleration is stored restitution member
params.m_coordenateAccel[k] = aRelErr + params.m_restitution[k] + aRel;
#else
dgFloat32 vRel;
dgFloat32 aRel;
dgFloat32 penetrationVeloc;
dgFloat32 penetrationCorrection;
dgVector relVeloc(Jt[k].m_jacobian_IM0.m_linear.CompProduct(bodyVeloc0));
relVeloc += Jt[k].m_jacobian_IM0.m_angular.CompProduct(bodyOmega0);
relVeloc += Jt[k].m_jacobian_IM1.m_linear.CompProduct(bodyVeloc1);
relVeloc += Jt[k].m_jacobian_IM1.m_angular.CompProduct(bodyOmega1);
vRel = relVeloc.m_x + relVeloc.m_y + relVeloc.m_z;
penetrationCorrection = vRel * params.m_timeStep * params.m_firstPassCoefFlag;
params.m_penetration[k] = params.m_penetration[k] - penetrationCorrection;
if (params.m_penetration[k] > dgFloat32(1.0f)) {
params.m_penetration[k] = dgFloat32(1.0f);
} else if (params.m_penetration[k] < dgFloat32(-1.0f)) {
params.m_penetration[k] = dgFloat32(-1.0f);
}
penetrationVeloc = -(params.m_penetration[k] * params.m_penetrationStiffness[k] * params.m_invTimeStep);
vRel += penetrationVeloc;
// centripetal acceleration is stored restitution member
aRel = params.m_externAccelaration[k] + params.m_restitution[k];
params.m_coordenateAccel[k] = (aRel - vRel * params.m_invTimeStep);
#endif
}
}
}
void dgBilateralConstraint::JointVelocityCorrection(
const dgJointAccelerationDecriptor &params) {
/*
const dgJacobianPair* const Jt = params.m_Jt;
const dgVector& bodyVeloc0 = params.m_body0->m_correctionVeloc;
const dgVector& bodyOmega0 = params.m_body0->m_correctionOmega;
const dgVector& bodyVeloc1 = params.m_body1->m_correctionVeloc;
const dgVector& bodyOmega1 = params.m_body1->m_correctionOmega;
for (dgInt32 k = 0; k < params.m_rowsCount; k ++) {
dgFloat32 vRel;
dgFloat32 penetrationCorrection;
dgVector relVeloc (Jt[k].m_jacobian_IM0.m_linear.CompProduct(bodyVeloc0));
relVeloc += Jt[k].m_jacobian_IM0.m_angular.CompProduct(bodyOmega0);
relVeloc += Jt[k].m_jacobian_IM1.m_linear.CompProduct(bodyVeloc1);
relVeloc += Jt[k].m_jacobian_IM1.m_angular.CompProduct(bodyOmega1);
vRel = relVeloc.m_x + relVeloc.m_y + relVeloc.m_z;
penetrationCorrection = vRel * params.m_timeStep;
params.m_penetration[k] -= penetrationCorrection;
params.m_coordenateAccel[k] = - vRel + params.m_penetration[k] * params.m_invTimeStep * 0.25f;
}
*/
}
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