diff --git a/lib/g3d/include/nn/g3d/g3d_MaterialObj.h b/lib/g3d/include/nn/g3d/g3d_MaterialObj.h
new file mode 100644
index 00000000..a12e8e6a
--- /dev/null
+++ b/lib/g3d/include/nn/g3d/g3d_MaterialObj.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <nn/gfx/gfx_Device.h>
+
+namespace nn::g3d {
+class MaterialObj {
+public:
+    struct InitializeArgument {
+        void CalculateMemorySize();
+    };
+
+    bool Initialize(const InitializeArgument&, void*, uint64_t);
+    void InitializeDependPointer();
+    int64_t GetBlockBufferAlignment(gfx::TDevice<gfx::ApiVariationNvn8>*) const;
+    int32_t CalculateBlockBufferSize(gfx::TDevice<gfx::ApiVariationNvn8>*) const;
+    void SetupBlockBufferImpl(gfx::TDevice<gfx::ApiVariationNvn8>*,
+                              gfx::TMemoryPool<gfx::ApiVariationNvn8>*, int64_t, uint64_t);
+    void ResetDirtyFlags();
+    bool SetupBlockBuffer(gfx::TDevice<gfx::ApiVariationNvn8>*,
+                          gfx::TMemoryPool<gfx::ApiVariationNvn8>*, int64_t, uint64_t);
+    void CleanupBlockBuffer(gfx::TDevice<gfx::ApiVariationNvn8>*);
+    void CalculateMaterial(int32_t);
+
+    template <bool>
+    void ConvertDirtyParams(void*, uint32_t*);
+
+private:
+    void* filler[16];
+};
+}  // namespace nn::g3d
diff --git a/lib/g3d/include/nn/g3d/g3d_ModelObj.h b/lib/g3d/include/nn/g3d/g3d_ModelObj.h
index e7b0b8cf..acab74e5 100644
--- a/lib/g3d/include/nn/g3d/g3d_ModelObj.h
+++ b/lib/g3d/include/nn/g3d/g3d_ModelObj.h
@@ -3,6 +3,9 @@
 #include <cstddef>
 #include <cstdint>
 
+#include <nn/g3d/g3d_MaterialObj.h>
+#include <nn/g3d/g3d_ViewVolume.h>
+
 namespace nn::g3d {
 
 class MaterialObj;
@@ -13,12 +16,20 @@ class SkeletonObj;
 // TODO
 class ModelObj {
 public:
+    MaterialObj* FindMaterial(const char* materialName);
+
     SkeletonObj* GetSkeleton() const { return m_Skeleton; }
 
     int32_t GetNumShapes() const { return m_NumShapes; }
 
     int32_t get_8c() const { return _8c; }
 
+    uint8_t GetViewDependentModelFlags() const { return m_ViewDependentModelFlags; }
+
+    MaterialObj* GetMaterial(int32_t index) const { return &m_Materials[index]; }
+
+    const Sphere& GetBounds() const { return *m_Bounds; }
+
 private:
     struct InitializeArgument;
 
@@ -28,7 +39,7 @@ class ModelObj {
     void* _8;
     void* _10;
     uint8_t _18;
-    uint8_t _19;
+    uint8_t m_ViewDependentModelFlags;  // TODO: is this right?
     uint16_t _1a;
     void* _20;
     void* _28;
@@ -37,7 +48,7 @@ class ModelObj {
     SkeletonObj* m_Skeleton;
     ShapeObj* m_Shapes;
     MaterialObj* m_Materials;
-    void* _50;
+    Sphere* m_Bounds;
     void* m_UserData;
     void* _60;
     void* _68;
diff --git a/lib/g3d/include/nn/g3d/g3d_ViewVolume.h b/lib/g3d/include/nn/g3d/g3d_ViewVolume.h
index cca55158..fd179688 100644
--- a/lib/g3d/include/nn/g3d/g3d_ViewVolume.h
+++ b/lib/g3d/include/nn/g3d/g3d_ViewVolume.h
@@ -6,7 +6,13 @@
 
 namespace nn::g3d {
 class Aabb;
-class Sphere;
+
+struct Sphere {
+    float x;
+    float y;
+    float z;
+    float radius;
+};
 
 class ViewVolume {
 public: