在PhysX中编辑一个Actors Gravity

Question

所以，现在我正在尝试在一个游戏的直升机系统上工作。我遇到的问题是，我想编辑直升机的重力，并且只在使用/使用直升机时，但现在它会导致所有使用PhysX的物体失去重力。

这是我正在使用的功能。 g_pPhysicsWorld->PhysXScene->setGravity(HeliGravity);是可能导致问题的原因。

void obj_Vehicle::HelicopterPhysx() // controls of helicopter 
{ 
    if (isHelicopter == true) 
    { 
     const float fTimePassed = r3dGetFrameTime(); 
     PxTransform pose = vd->vehicle->getRigidDynamicActor()->getGlobalPose(); 
     r3dVector angles; 
     r3dPoint3D position(0,0,0); 
     PxVec3 HeliGravity(0,0,0); 

     if (HasDriver() && HSpeed > 70) 
     { 
      if (Keyboard->IsPressed(kbsRight)) // Rotate Left 
      { 
       if (!(Keyboard->IsPressed(kbsW) || Keyboard->IsPressed(kbsS))) 
        HelyX+=0.5f; 
      } 
      else if (Keyboard->IsPressed(kbsLeft)) // rotate Right 
      { 
       if (!(Keyboard->IsPressed(kbsW) || Keyboard->IsPressed(kbsS))) 
        HelyX-=0.5f; 
      } 
      if (Keyboard->IsPressed(kbsW) && distanceFromGround>=5) // move front 
      { 
       HeliGravity = PxVec3(0,-1.0,0); 
       if (HelyY<15.0f) 
        HelyY+=0.5f; 
       //HelyUp=-0.1f; 

       if (HelyFB>1 && FB>=0) 
        FB=HelyFB-=0.25f; 
      } 
      else { 
       if (FB >0 && HelyFB<20) 
        FB=HelyFB+=0.05f; 

       if (HelyY>0) 
       { 
        HelyY-=0.5f; 
        if (HelyY<0) HelyY = 0; 
       } 
      } 
      if (Keyboard->IsPressed(kbsS) && distanceFromGround>=5) // Move back 
      { 
       if (HelyY>-15.0f) 
        HelyY-=0.5f; 

       if (HelyFB>5 && FB<=0) 
        FB=abs(HelyFB-=0.5f)*-1; 
      } 
      else { 
       if (FB <0 && HelyFB<20) 
        FB=abs(HelyFB+=0.05f)*-1; 
       if (HelyY<0) 
       { 
        HelyY+=0.5f; 
       } 
      } 
      if (Keyboard->IsPressed(kbsD) && distanceFromGround>=10) // move Right 
      { 
       if (HelyZ>-30.0) 
        HelyZ-=0.5f; 

       if ((Keyboard->IsPressed(kbsW) || Keyboard->IsPressed(kbsS))) 
       { 
        HelyX+=0.5f; 
       } 
       else { 
        if (HelyLR>5 && LR>=0) 
         LR=HelyLR-=0.5f; 
       } 
      } 
      else { 
       if (LR >0 && HelyLR<20) 
        LR=HelyLR+=0.1f; 
       if (HelyZ<0) 
       { 
        HelyZ+=0.5f; 
       } 
      } 

      if (Keyboard->IsPressed(kbsA) && distanceFromGround>=10) // move Left 
      { 

       if (HelyZ<30.0) 
        HelyZ+=0.5f; 

       if ((Keyboard->IsPressed(kbsW) || Keyboard->IsPressed(kbsS))) 
       { 
        HelyX-=0.5f; 
       } 
       else { 
        if (HelyLR>5 && LR<=0) 
         LR=abs(HelyLR-=0.5f)*-1; 
       } 

      } 
      else { 
       if (LR <0 && HelyLR<20) 
        LR=abs(HelyLR+=0.1f)*-1; 

       if (HelyZ>0) 
       { 
        HelyZ-=0.5f; 
        if (HelyZ<0) HelyZ = 0; 
       } 
      } 
      if (Keyboard->IsPressed(kbsQ) && HSpeed > 70) // move up 
      { 
       //r3dOutToLog("###### distanceFromGround %f\n",distanceFromGround); 
       //if (distanceFromGround<100) 
        //HelyUp=0.1f; 
       HeliGravity = PxVec3(0,2,0); //m70b1jr gravity 
      } 
      else if (Keyboard->IsPressed(kbsZ)) // Move down 
      { 
       HeliGravity = PxVec3(0,-1,0); 
       //HelyUp=-0.1f; 
      } 
     } 
     else { 

      if (distanceFromGround>0) 
      { 
       if (HSpeed < 50 || !CheckFuel()) 
       { 
        //r3dOutToLog("######## HSpeed: %f\n",HSpeed); 
        //Gravity = PxVec3(0,-9.81f,0); 
        if (HelyUp>0) 
         HelyUp=-0.1f; 
       } 
      } 
     } 
     pose.p.y+=HelyUp; 
     if (HelyFB>=20) 
      FB=0; 
     if (HelyLR>=20) 
      LR=0; 
     //r3dOutToLog("######## HelyFB: %f FB: %f\n",HelyFB,FB); 
     position = r3dPoint3D(pose.p.x,pose.p.y,pose.p.z) + (GetvForw()/FB) + (GetvRight()/LR); 
       if (HelyUp<0) 
       { 
        HelyUp+=0.001f; 
       } 
       else if (HelyUp>0) 
       { 
        HelyUp-=0.001f; 
        if (HelyUp<0) HelyUp = 0; 
       } 

     //g_pPhysicsWorld->PhysXScene->setGravity(HeliGravity); // m70 test 

     D3DXMATRIX RotateMatrix,RotateMatrix2,toOrigin,fromOrigin,boneTransform; 
     D3DXMatrixTranslation(&toOrigin, -GetPosition().x, -GetPosition().y, -GetPosition().z); 
     D3DXMatrixTranslation(&fromOrigin, pose.p.x, pose.p.y, pose.p.z); 

     D3DXMatrixRotationYawPitchRoll(&RotateMatrix,R3D_DEG2RAD(HelyX),R3D_DEG2RAD(HelyY),R3D_DEG2RAD(HelyZ)); 
     D3DXMatrixMultiply(&boneTransform, &fromOrigin, &RotateMatrix); 

     D3DXMatrixMultiply(&boneTransform, &boneTransform, &toOrigin); 

     PxMat33 orientation(PxVec3(boneTransform._11, boneTransform._12, boneTransform._13), 
         PxVec3(boneTransform._21, boneTransform._22, boneTransform._23), 
         PxVec3(boneTransform._31, boneTransform._32, boneTransform._33)); 
     pose.q = PxQuat(orientation); 

     /*D3DMATRIX m = GetRotationMatrix();*/ 
     pose.p.x=position.x;//HelyFB; 
     pose.p.z=position.z;//HelyLR; 

     /*HelyLR=position.z; 
     HelyFB=position.x;*/ 
     vd->vehicle->getRigidDynamicActor()->setGlobalPose(pose); 
     SetPosition(r3dPoint3D(position.x,pose.p.y,position.z)); //Another test 
     r3dPoint3D vel = GetVelocity(); 
     vel.x *= pose.p.x; 
     vel.y *= pose.p.y; 
     vel.z *= pose.p.y; 
     if(vel.Length() < 0.001f) vel = r3dPoint3D(0, 0, 0); 
     SetVelocity(vel); 
    } 
} 

Answer 1

setGravity()用于设置场景影响的所有行为体的全球重力。

如果你想“个人”重力必须禁用全球重力对于演员的演员：

PxActor::setActorFlag(PxActorFlag::eDISABLE_GRAVITY, false); 

，然后添加你自己的力量演员：

void PxRigidBody::addForce(const PxVec3& force, PxForceMode::Enum mode, bool autowake); 

注意必须在每个更新帧上调用addForce()。