用hitproxy点选最精确

这个原理实际上就是阴影图，像素级自然最精确了。

废话不多说，上源码

    UGameViewportClient * clientView = GWorld->GetGameViewport();
    FViewport* InViewport = clientView->Viewport;

    float X = InViewport->GetMouseX();
    float Y = InViewport->GetMouseY();
    HHitProxy* HitProxy = InViewport->GetHitProxy(X, Y);
    if (nullptr == HitProxy)
    {
        return nullptr;
    }
    if ( HitProxy->IsA(HActor::StaticGetType()))
    {
        HActor* ActorHit = static_cast<HActor*>(HitProxy);
        if (ActorHit->Actor != NULL)
        {
            AActor* theActor = ActorHit->Actor;
            return theActor;
        }
    }
    return nullptr;

 

分割线：

-------------------------------------

 

其实，这项技术在dx11中就有了，cpu和gpu互传

在

typedef struct D3D11_TEXTURE2D_DESC

{

   ...

D3D11_USAGE Usage里面

....

}

 

看来要想玩好ue4，必须底层要搞好，DX和pbr在试用期过后还得搞搞，才能真正发挥ue4的强大