Method Sync

Hydrogent/src/HnMaterial.cpp:102–151

}

void HnMaterial::Sync(pxr::HdSceneDelegate* SceneDelegate,
                      pxr::HdRenderParam*   RenderParam,
                      pxr::HdDirtyBits*     DirtyBits)
{
    if (*DirtyBits == pxr::HdMaterial::Clean)
        return;

    HnRenderDelegate*   RenderDelegate = static_cast<HnRenderDelegate*>(SceneDelegate->GetRenderIndex().GetRenderDelegate());
    HnTextureRegistry&  TexRegistry    = RenderDelegate->GetTextureRegistry();
    const USD_Renderer& UsdRenderer    = *RenderDelegate->GetUSDRenderer();

    // A mapping from the texture name to the texture coordinate set index (e.g. "diffuseColor" -> 0)
    TexNameToCoordSetMapType TexNameToCoordSetMap;

    pxr::VtValue vtMat = SceneDelegate->GetMaterialResource(GetId());
    if (vtMat.IsHolding<pxr::HdMaterialNetworkMap>())
    {
        const pxr::HdMaterialNetworkMap& hdNetworkMap = vtMat.UncheckedGet<pxr::HdMaterialNetworkMap>();
        if (!hdNetworkMap.terminals.empty() && !hdNetworkMap.map.empty())
        {
            try
            {
                m_Network = HnMaterialNetwork{GetId(), hdNetworkMap}; // May throw

                TexNameToCoordSetMap = AllocateTextures(TexRegistry);
                ProcessMaterialNetwork();
            }
            catch (const std::runtime_error& err)
            {
                LOG_ERROR_MESSAGE("Failed to create material network for material ", GetId(), ": ", err.what());
                m_Network = {};
            }
            catch (...)
            {
                LOG_ERROR_MESSAGE("Failed to create material network for material ", GetId(), ": unknown error");
                m_Network = {};
            }
        }
    }

    // It is important to initialize texture attributes with default values even if there is no material network.
    InitTextureAttribs(TexRegistry, UsdRenderer, TexNameToCoordSetMap);

    if (RenderParam)
    {
        static_cast<HnRenderParam*>(RenderParam)->MakeAttribDirty(HnRenderParam::GlobalAttrib::Material);
    }

    *DirtyBits = HdMaterial::Clean;
}

static bool ReadFallbackValue(const HnMaterialNetwork& Network, const pxr::TfToken& Name, float3& Value)
{