diff --git a/Include/RTGL1/RTGL1.h b/Include/RTGL1/RTGL1.h
index f14ffe36..0f54d57a 100644
--- a/Include/RTGL1/RTGL1.h
+++ b/Include/RTGL1/RTGL1.h
@@ -369,6 +369,12 @@ typedef enum RgMeshInfoFlagBits
     RG_MESH_EXPORT_AS_SEPARATE_FILE = 1 << 0,
     RG_MESH_FIRST_PERSON            = 1 << 1,
     RG_MESH_FIRST_PERSON_VIEWER     = 1 << 2,
+    // Force all primitives of this mesh to be a mirror. Useful for overriding replacement RgMeshPrimitiveFlags.
+    RG_MESH_FORCE_MIRROR            = 1 << 3,
+    // Force all primitives of this mesh to be a glass. Useful for overriding replacement RgMeshPrimitiveFlags.
+    RG_MESH_FORCE_GLASS             = 1 << 4,
+    // Force all primitives of this mesh to be a water. Useful for overriding replacement RgMeshPrimitiveFlags.
+    RG_MESH_FORCE_WATER             = 1 << 5,
 } RgMeshInfoFlagBits;
 typedef uint32_t RgMeshInfoFlags;
 
diff --git a/Source/ASManager.cpp b/Source/ASManager.cpp
index 8106c335..4ddc666a 100644
--- a/Source/ASManager.cpp
+++ b/Source/ASManager.cpp
@@ -873,7 +873,7 @@ bool RTGL1::ASManager::AddMeshPrimitive( uint32_t                   frameIndex,
             .prevModel_1 = { /* set in geomInfoManager */ },
             .prevModel_2 = { /* set in geomInfoManager */ },
 
-            .flags = GeomInfoManager::GetPrimitiveFlags( primitive, !isStatic && !isReplacement ),
+            .flags = GeomInfoManager::GetPrimitiveFlags( &mesh, primitive, !isStatic && !isReplacement ),
 
             .texture_base = layerTextures[ 0 ].indices[ TEXTURE_ALBEDO_ALPHA_INDEX ],
             .texture_base_ORM =
diff --git a/Source/GeomInfoManager.cpp b/Source/GeomInfoManager.cpp
index aca74f26..f306a29e 100644
--- a/Source/GeomInfoManager.cpp
+++ b/Source/GeomInfoManager.cpp
@@ -109,7 +109,9 @@ const RgFloat2D* RTGL1::GeomInfoManager::AccessLayerTexCoords( const RgMeshPrimi
     return nullptr;
 }
 
-uint32_t RTGL1::GeomInfoManager::GetPrimitiveFlags( const RgMeshPrimitiveInfo& info, bool isDynamicVertexData )
+uint32_t RTGL1::GeomInfoManager::GetPrimitiveFlags( const RgMeshInfo*          mesh,
+                                                    const RgMeshPrimitiveInfo& info,
+                                                    bool                       isDynamicVertexData )
 {
     uint32_t f = 0;
 
@@ -126,12 +128,14 @@ uint32_t RTGL1::GeomInfoManager::GetPrimitiveFlags( const RgMeshPrimitiveInfo& i
         f |= GetMaterialBlendFlags( *layers, 3 );
     }
 
-    if( info.flags & RG_MESH_PRIMITIVE_MIRROR )
+    if( ( info.flags & RG_MESH_PRIMITIVE_MIRROR ) ||
+        ( mesh && ( mesh->flags & RG_MESH_FORCE_MIRROR ) ) )
     {
         f |= GEOM_INST_FLAG_REFLECT;
     }
 
-    if( info.flags & RG_MESH_PRIMITIVE_WATER )
+    if( ( info.flags & RG_MESH_PRIMITIVE_WATER ) ||
+        ( mesh && ( mesh->flags & RG_MESH_FORCE_WATER ) ) )
     {
         f |= GEOM_INST_FLAG_MEDIA_TYPE_WATER;
         f |= GEOM_INST_FLAG_REFLECT;
@@ -145,7 +149,8 @@ uint32_t RTGL1::GeomInfoManager::GetPrimitiveFlags( const RgMeshPrimitiveInfo& i
         f |= GEOM_INST_FLAG_REFRACT;
     }
 
-    if( info.flags & RG_MESH_PRIMITIVE_GLASS )
+    if( ( info.flags & RG_MESH_PRIMITIVE_GLASS ) ||
+        ( mesh && ( mesh->flags & RG_MESH_FORCE_GLASS ) ) )
     {
         f |= GEOM_INST_FLAG_MEDIA_TYPE_GLASS;
         f |= GEOM_INST_FLAG_REFLECT;
diff --git a/Source/GeomInfoManager.h b/Source/GeomInfoManager.h
index 2bdf911f..a96209dd 100644
--- a/Source/GeomInfoManager.h
+++ b/Source/GeomInfoManager.h
@@ -75,7 +75,9 @@ class GeomInfoManager
 
 
     static bool     LayerExists( const RgMeshPrimitiveInfo& info, uint32_t layerIndex );
-    static uint32_t GetPrimitiveFlags( const RgMeshPrimitiveInfo& info, bool isDynamicVertexData );
+    static uint32_t GetPrimitiveFlags( const RgMeshInfo*          mesh,
+                                       const RgMeshPrimitiveInfo& info,
+                                       bool                       isDynamicVertexData );
 
     static const RgFloat2D* AccessLayerTexCoords( const RgMeshPrimitiveInfo& info,
                                                   uint32_t                   layerIndex );
diff --git a/Source/RasterizedDataCollector.cpp b/Source/RasterizedDataCollector.cpp
index 18028a8c..cf4ad698 100644
--- a/Source/RasterizedDataCollector.cpp
+++ b/Source/RasterizedDataCollector.cpp
@@ -232,7 +232,7 @@ void RTGL1::RasterizedDataCollector::AddPrimitive( uint32_t                   fr
 
     PushInfo( rasterType ) = {
         .transform = transform,
-        .flags     = GeomInfoManager::GetPrimitiveFlags( info, false ),
+        .flags     = GeomInfoManager::GetPrimitiveFlags( nullptr, info, false ),
 
         .texture_base     = textures[ 0 ].indices[ TEXTURE_ALBEDO_ALPHA_INDEX ],
         .texture_base_ORM = textures[ 0 ].indices[ TEXTURE_OCCLUSION_ROUGHNESS_METALLIC_INDEX ],
diff --git a/Source/VertexCollectorFilterType.cpp b/Source/VertexCollectorFilterType.cpp
index ba24fa98..4eb2b97d 100644
--- a/Source/VertexCollectorFilterType.cpp
+++ b/Source/VertexCollectorFilterType.cpp
@@ -83,7 +83,9 @@ FL RTGL1::VertexCollectorFilterTypeFlags_GetForGeometry( const RgMeshInfo&
         flags |= FL( FT::PT_ALPHA_TESTED );
     }
     else if( ( primitive.flags & RG_MESH_PRIMITIVE_WATER ) ||
+             ( mesh.flags & RG_MESH_FORCE_WATER ) ||
              ( primitive.flags & RG_MESH_PRIMITIVE_GLASS ) ||
+             ( mesh.flags & RG_MESH_FORCE_GLASS ) ||
              ( primitive.flags & RG_MESH_PRIMITIVE_GLASS_IF_SMOOTH ) ||
              ( primitive.flags & RG_MESH_PRIMITIVE_ACID ) )
     {
diff --git a/Source/VulkanDevice.cpp b/Source/VulkanDevice.cpp
index 8cd302b1..bb2c3fbb 100644
--- a/Source/VulkanDevice.cpp
+++ b/Source/VulkanDevice.cpp
@@ -985,7 +985,9 @@ namespace
         }
 
         if( !( primitive.flags & RG_MESH_PRIMITIVE_GLASS ) &&
+            !( mesh.flags & RG_MESH_FORCE_GLASS ) &&
             !( primitive.flags & RG_MESH_PRIMITIVE_WATER ) &&
+            !( mesh.flags & RG_MESH_FORCE_WATER ) &&
             !( primitive.flags & RG_MESH_PRIMITIVE_ACID ) )
         {
             if( primitive.flags & RG_MESH_PRIMITIVE_TRANSLUCENT )