Method updateGridVolumes

Source/Falcor/Scene/Scene.cpp:1658–1710

    }

    IScene::UpdateFlags Scene::updateGridVolumes(bool forceUpdate)
    {
        GridVolume::UpdateFlags combinedUpdates = GridVolume::UpdateFlags::None;

        // Update animations and get combined updates.
        for (const auto& pGridVolume : mGridVolumes)
        {
            if (pGridVolume->mpDevice != mpDevice)
                FALCOR_THROW("GridVolume '{}' was created with a different device than the Scene.", pGridVolume->getName());
            updateAnimatable(*pGridVolume, *mpAnimationController, forceUpdate);
            combinedUpdates |= pGridVolume->getUpdates();
        }

        // Early out if no volumes have changed.
        if (!forceUpdate && combinedUpdates == GridVolume::UpdateFlags::None) return IScene::UpdateFlags::None;

        // Upload grids.
        if (forceUpdate)
        {
            bindGridVolumes();
        }

        // Upload volumes and clear updates.
        uint32_t volumeIndex = 0;
        for (const auto& pGridVolume : mGridVolumes)
        {
            if (forceUpdate || pGridVolume->getUpdates() != GridVolume::UpdateFlags::None)
            {
                // Fetch copy of volume data.
                auto data = pGridVolume->getData();
                data.densityGrid = (pGridVolume->getDensityGrid() ? mGridIDs.at(pGridVolume->getDensityGrid()) : SdfGridID::Invalid()).getSlang();
                data.emissionGrid = (pGridVolume->getEmissionGrid() ? mGridIDs.at(pGridVolume->getEmissionGrid()) : SdfGridID::Invalid()).getSlang();
                // Merge grid and volume transforms.
                const auto& densityGrid = pGridVolume->getDensityGrid();
                if (densityGrid)
                {
                    data.transform = mul(data.transform, densityGrid->getTransform());
                    data.invTransform = mul(densityGrid->getInvTransform(), data.invTransform);
                }
                mpGridVolumesBuffer->setElement(volumeIndex, data);
            }
            pGridVolume->clearUpdates();
            volumeIndex++;
        }

        IScene::UpdateFlags flags = IScene::UpdateFlags::None;
        if (is_set(combinedUpdates, GridVolume::UpdateFlags::TransformChanged)) flags |= IScene::UpdateFlags::GridVolumesMoved;
        if (is_set(combinedUpdates, GridVolume::UpdateFlags::PropertiesChanged)) flags |= IScene::UpdateFlags::GridVolumePropertiesChanged;
        if (is_set(combinedUpdates, GridVolume::UpdateFlags::GridsChanged)) flags |= IScene::UpdateFlags::GridVolumeGridsChanged;
        if (is_set(combinedUpdates, GridVolume::UpdateFlags::BoundsChanged)) flags |= IScene::UpdateFlags::GridVolumeBoundsChanged;

        return flags;
    }

    void Scene::bindGridVolumes()
    {