[UE4]SetPhysicsLinearVelocity、AddForce区别

 

SetPhysicsLinearVelocity：用于移动物体。但官方文档建议谨慎使用此接口，建议用 AddForce或者AddImpulse

 

SetPhysicsAngularVelocity：用于旋转物体。但官方文档建议谨慎使用此接口，建议用 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：
一般动画蓝图中使用Velocity来判定当前对象的移动速度从而来判定是否播放跑步动画。AddForce并不会修改Velocity值，所以如果要移动的同时来设置Velocity，需要手动设置：

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()，需要将SetSimulatePhysics设置为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