Method SelectLevelOfDetail

GTE/Graphics/DLODNode.cpp:85–124

}

void DLODNode::SelectLevelOfDetail(std::shared_ptr<Camera> const& camera)
{
    // The child array of a DLODNode is compact; that is, there are no empty
    // slots in the array and the number of children is mChild.size().
    // Moreover, it is assumed that all model distance values were set for
    // these children.
    LogAssert(
        mChild.size() == static_cast<size_t>(mNumLevelsOfDetail),
        "Invalid DLODNode detected by SelectLevelOfDetail.");

    for (auto const& child : mChild)
    {
        LogAssert(
            child != nullptr,
            "Invalid DLODNode child detected by SelectLevelOfDetail.");
    }

    // Compute the world LOD center.
    mWorldLODCenter = DoTransform(worldTransform.GetHMatrix(), mModelLODCenter);

    // Compute the world squared-distance intervals.
    for (int32_t i = 0; i < mNumLevelsOfDetail; ++i)
    {
        mWorldMinDistance[i] = worldTransform.GetUniformScale() * mModelMinDistance[i];
        mWorldMaxDistance[i] = worldTransform.GetUniformScale() * mModelMaxDistance[i];
    }

    // Select the LOD child.
    SetActiveChild(SwitchNode::invalidChild);
    Vector4<float> diff = mWorldLODCenter - camera->GetPosition();
    float distance = Length(diff);
    for (int32_t i = 0; i < mNumLevelsOfDetail; ++i)
    {
        if (mWorldMinDistance[i] <= distance && distance < mWorldMaxDistance[i])
        {
            SetActiveChild(i);
            break;
        }
    }
}

void DLODNode::GetVisibleSet(Culler& culler, std::shared_ptr<Camera> const& camera,
    bool noCull)