text: //
  // Copyright (c) 2008-2017 the Urho3D project.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #pragma once
  
  #include "../Graphics/Drawable.h"
  
  namespace Urho3D
  {
  
  class Model;
  
  /// Static model per-geometry extra data.
  struct StaticModelGeometryData
  {
      /// Geometry center.
      Vector3 center_;
      /// Current LOD level.
      unsigned lodLevel_;
  };
  
  /// Static model component.
  class URHO3D_API StaticModel : public Drawable
  {
      URHO3D_OBJECT(StaticModel, Drawable);
  
  public:
      /// Construct.
      StaticModel(Context* context);
      /// Destruct.
      ~StaticModel();
      /// Register object factory. Drawable must be registered first.
      static void RegisterObject(Context* context);
  
      /// Process octree raycast. May be called from a worker thread.
      virtual void ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results);
      /// Calculate distance and prepare batches for rendering. May be called from worker thread(s), possibly re-entrantly.
      virtual void UpdateBatches(const FrameInfo& frame);
      /// Return the geometry for a specific LOD level.
      virtual Geometry* GetLodGeometry(unsigned batchIndex, unsigned level);
      /// Return number of occlusion geometry triangles.
      virtual unsigned GetNumOccluderTriangles();
      /// Draw to occlusion buffer. Return true if did not run out of triangles.
      virtual bool DrawOcclusion(OcclusionBuffer* buffer);
  
      /// Set model.
      virtual void SetModel(Model* model);
      /// Set material on all geometries.
      virtual void SetMaterial(Material* material);
      /// Set material on one geometry. Return true if successful.
      virtual bool SetMaterial(unsigned index, Material* material);
      /// Set occlusion LOD level. By default (M_MAX_UNSIGNED) same as visible.
      void SetOcclusionLodLevel(unsigned level);
      /// Apply default materials from a material list file. If filename is empty (default), the model's resource name with extension .txt will be used.
      void ApplyMaterialList(const String& fileName = String::EMPTY);
  
      /// Return model.
      Model* GetModel() const { return model_; }
  
      /// Return number of geometries.
      unsigned GetNumGeometries() const { return geometries_.Size(); }
  
      /// Return material by geometry index.
      virtual Material* GetMaterial(unsigned index = 0) const;
  
      /// Return occlusion LOD level.
      unsigned GetOcclusionLodLevel() const { return occlusionLodLevel_; }
  
      /// Determines if the given world space point is within the model geometry.
      bool IsInside(const Vector3& point) const;
      /// Determines if the given local space point is within the model geometry.
      bool IsInsideLocal(const Vector3& point) const;
  
      /// Set model attribute.
      void SetModelAttr(const ResourceRef& value);
      /// Set materials attribute.
      void SetMaterialsAttr(const ResourceRefList& value);
      /// Return model attribute.
      ResourceRef GetModelAttr() const;
      /// Return materials attribute.
      const ResourceRefList& GetMaterialsAttr() const;
  
  protected:
      /// Recalculate the world-space bounding box.
      virtual void OnWorldBoundingBoxUpdate();
      /// Set local-space bounding box.
      void SetBoundingBox(const BoundingBox& box);
      /// Set number of geometries.
      void SetNumGeometries(unsigned num);
      /// Reset LOD levels.
      void ResetLodLevels();
      /// Choose LOD levels based on distance.
      void CalculateLodLevels();
  
      /// Extra per-geometry data.
      PODVector<StaticModelGeometryData> geometryData_;
      /// All geometries.
      Vector<Vector<SharedPtr<Geometry> > > geometries_;
      /// Model.
      SharedPtr<Model> model_;
      /// Occlusion LOD level.
      unsigned occlusionLodLevel_;
      /// Material list attribute.
      mutable ResourceRefList materialsAttr_;
  
  private:
      /// Handle model reload finished.
      void HandleModelReloadFinished(StringHash eventType, VariantMap& eventData);
  };
  
  }
  