UE4 SetPhysicsLinearVelocity、AddForce區別
![[UE4]SetPhysicsLinearVelocity、AddForce區別](http://www.mp636.cn/uploads/allimg/190606/0R0533541-0.jpg "[UE4]SetPhysicsLinearVelocity、AddForce區別")
SetPhysicsAngularVelocity：用于旋轉物體。但官方文檔建議謹慎使用此接口，建議用 AddTorque或者AddImpulse
AddForce用法：
- mesh->AddForce(FVector::RightVector * mesh->GetBodyInstance()->GetBodyMass() * 1000);
https://answers.unrealengine.com/questions/290824/addforceaddimpulse-wont-work.html
修改Velocity：
一般動畫藍圖中使用Velocity來判定當前對象的移動速度從而來判定是否播放跑步動畫。AddForce并不會修改Velocity值，所以如果要移動的同時來設置Velocity，需要手動設置：
- MyChar->GetCharacterMovement()->Velocity += FVector(0,0,20000);
https://answers.unrealengine.com/questions/27069/addimpulse-or-addforce-on-character.html
注意，如果要使用SetPhysicsLinearVelocity()，需要將SetSimulatePhysics設置為true：
- MyCharacter->GetMesh()->SetSimulatePhysics(true);
- MyCharacter->GetMesh()->SetPhysicsLinearVelocity(FVector(100.f, 100.f, 100.f));
https://answers.unrealengine.com/questions/140978/how-to-set-a-initial-velocity.html
UPrimitiveComponent::AddForce
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/Components/UPrimitiveComponent/AddForce/index.html
UPrimitiveComponent::AddImpulse
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/Components/UPrimitiveComponent/AddImpulse/index.html
UPrimitiveComponent::SetPhysicsLinearVelocity
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/Components/UPrimitiveComponent/SetPhysicsLinearVelocity/index.html
UPrimitiveComponent::SetPhysicsAngularVelocity
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/Components/UPrimitiveComponent/SetPhysicsAngularVelocity/index.html
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