UE4射线的碰撞与绘制

http://blog.csdn.net/qq992817263/article/details/51800657

//起点 终点

FHitResult RayGetHitResult(FVector TraceStart, FVector TraceEnd)

{

    FCollisionQueryParams TraceParams(FName(TEXT("TraceUsableActor")), true, this);

    TraceParams.bTraceAsyncScene = true;

    TraceParams.bReturnPhysicalMaterial = false;

    TraceParams.bTraceComplex = true;

    //Hit是用来存储射线的一些数据，如Actor、坐标等等

    FHitResult Hit(ForceInit);

    if (GetWorld()->LineTraceSingle(Hit, TraceStart, TraceEnd, ECC_Visibility, TraceParams))

    {

        //绘制射线

        DrawRayLine(TraceStart, Hit.Location,0.03f);

    }

    return Hit;

}  

//起点 终点 绘制线的显示的时间

void DrawRayLine(FVector StartPos, FVector EndPos,float fLifeTime)

{

    ULineBatchComponent* const LineBatcher = GetWorld()->PersistentLineBatcher;

    const float LifeTime = fLifeTime;

    if (LineBatcher != NULL)

    {

        float LineLifeTime = (LifeTime > .f) ? LifeTime : LineBatcher->DefaultLifeTime;

        LineBatcher->DrawLine(StartPos, EndPos, FLinearColor::Red, , .f, LineLifeTime);

    }

}