[UE4]Linear Algebra & Plane Geometry API

keywords：UE4、Linear Algebra、Plane Geometry、线性代数、解析几何 范围判定 检测一个点是否在一个多边形(或矩形)的内部(2D和3D) FBox2D::IsInside(const FVector2D& TestPoint) FBox::IsInside(const FVector& TestPoint) FIntRect::Contains( FIntPoint P ) 角度计算 计算两个向量的夹角(Get an angle between 2 Vectors)，范围：(0, 180) float AimAtAngle = FMath::RadiansToDegrees(acosf(FVector::DotProduct(PlayerDirection, MouseDirection))); 参考：How to get an angle between 2 Vectors? https://answers.unrealengine.com/questions/31058/how-to-get-an-angle-between-2-vector...

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