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);
    }
}