cocos_lib/cocos/physics/physx/joints/PhysXRevolute.cpp

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#include "physics/physx/joints/PhysXRevolute.h"
#include "math/Quaternion.h"
#include "math/Utils.h"
#include "math/Vec3.h"
#include "physics/physx/PhysXSharedBody.h"
#include "physics/physx/PhysXUtils.h"
#include "physics/physx/PhysXWorld.h"

namespace cc {
namespace physics {

void PhysXRevolute::onComponentSet() {
    _mJoint = PxRevoluteJointCreate(PxGetPhysics(), &getTempRigidActor(), physx::PxTransform{physx::PxIdentity}, nullptr, physx::PxTransform{physx::PxIdentity});
    _mlimit.stiffness = 0;
    _mlimit.damping = 0;
    _mlimit.restitution = 0.4;
    _mlimit.contactDistance = 0.01;

    auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
    joint->setConstraintFlag(physx::PxConstraintFlag::ePROJECTION, true);
    joint->setConstraintFlag(physx::PxConstraintFlag::eDRIVE_LIMITS_ARE_FORCES, true);
    joint->setProjectionAngularTolerance(0.2);
    joint->setProjectionLinearTolerance(0.2);

    setEnableDebugVisualization(true);
}

void PhysXRevolute::setPivotA(float x, float y, float z) {
    _mPivotA = physx::PxVec3{x, y, z};
    updatePose();
}

void PhysXRevolute::setPivotB(float x, float y, float z) {
    _mPivotB = physx::PxVec3{x, y, z};
    updatePose();
}

void PhysXRevolute::setAxis(float x, float y, float z) {
    _mAxis = physx::PxVec3{x, y, z};
    updatePose();
}

void PhysXRevolute::setLimitEnabled(bool v) {
    _limitEnabled = v;
    auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
    joint->setRevoluteJointFlag(physx::PxRevoluteJointFlag::eLIMIT_ENABLED, _limitEnabled);
    if (v) {
        joint->setLimit(_mlimit);
    }
}

void PhysXRevolute::setLowerLimit(float v) {
    _lowerLimit = v;
    _mlimit.lower = mathutils::toRadian(_lowerLimit);
    if (_limitEnabled) {
        auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
        joint->setLimit(_mlimit);
    }
}

void PhysXRevolute::setUpperLimit(float v) {
    _upperLimit = v;
    _mlimit.upper = mathutils::toRadian(_upperLimit);
    if (_limitEnabled) {
        auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
        joint->setLimit(_mlimit);
    }
}

void PhysXRevolute::setMotorEnabled(bool v) {
    _motorEnabled = v;
    auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
    joint->setRevoluteJointFlag(physx::PxRevoluteJointFlag::eDRIVE_ENABLED, _motorEnabled);
    if (v) {
        joint->setDriveVelocity(_motorVelocity / 60.0);
        joint->setDriveForceLimit(_motorForceLimit);
    }
}

void PhysXRevolute::setMotorVelocity(float v) {
    _motorVelocity = v;
    if (_motorEnabled) {
        auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
        joint->setDriveVelocity(_motorVelocity / 60.0);
    }
}

void PhysXRevolute::setMotorForceLimit(float v) {
    _motorForceLimit = v;
    if (_motorEnabled) {
        auto *joint = static_cast<physx::PxRevoluteJoint *>(_mJoint);
        joint->setDriveForceLimit(_motorForceLimit);
    }
}

void PhysXRevolute::updateScale0() {
    updatePose();
}

void PhysXRevolute::updateScale1() {
    updatePose();
}

void PhysXRevolute::updatePose() {
    physx::PxTransform pose0{physx::PxIdentity};
    physx::PxTransform pose1{physx::PxIdentity};

    auto xAxis = _mAxis.getNormalized();
    auto yAxis = physx::PxVec3(0, 1, 0);
    auto zAxis = _mAxis.cross(yAxis);
    if (zAxis.magnitude() < 0.0001) {
        yAxis = physx::PxVec3(0, 0, 1).cross(xAxis);
        zAxis = xAxis.cross(yAxis);
    } else {
        yAxis = zAxis.cross(xAxis);
    }

    yAxis = yAxis.getNormalized();
    zAxis = zAxis.getNormalized();

    Mat4 transform(
        xAxis.x, xAxis.y, xAxis.z, 0,
        yAxis.x, yAxis.y, yAxis.z, 0,
        zAxis.x, zAxis.y, zAxis.z, 0,
        0.F, 0.F, 0.F, 1.F);

    auto quat = Quaternion();
    transform.getRotation(&quat);

    // pos and rot in with respect to bodyA
    auto *node0 = _mSharedBody->getNode();
    node0->updateWorldTransform();
    pose0.p = _mPivotA * node0->getWorldScale();
    pose0.q = physx::PxQuat(quat.x, quat.y, quat.z, quat.w);
    _mJoint->setLocalPose(physx::PxJointActorIndex::eACTOR0, pose0);

    if (_mConnectedBody) {
        auto *node1 = _mConnectedBody->getNode();
        node1->updateWorldTransform();
        pose1.p = _mPivotB * node1->getWorldScale();
        const auto &rot_0 = node0->getWorldRotation();
        const auto &rot_1_i = node1->getWorldRotation().getInversed();
        pose1.q = physx::PxQuat(rot_1_i.x, rot_1_i.y, rot_1_i.z, rot_1_i.w) * physx::PxQuat(rot_0.x, rot_0.y, rot_0.z, rot_0.w) * pose0.q;
    } else {
        const auto &wr = node0->getWorldRotation();
        auto pos = Vec3(_mPivotA.x, _mPivotA.y, _mPivotA.z);
        pos.multiply(node0->getWorldScale());
        pos.transformQuat(node0->getWorldRotation());
        pos.add(node0->getWorldPosition());
        pose1.p = physx::PxVec3(pos.x, pos.y, pos.z);
        pose1.q = physx::PxQuat{wr.x, wr.y, wr.z, wr.w} * pose0.q;
    }
    _mJoint->setLocalPose(physx::PxJointActorIndex::eACTOR1, pose1);
}

} // namespace physics
} // namespace cc