diff --git a/DirectXTex/DirectXTex.h b/DirectXTex/DirectXTex.h
index 32d607b..2d5ba34 100644
--- a/DirectXTex/DirectXTex.h
+++ b/DirectXTex/DirectXTex.h
@@ -123,11 +123,14 @@ namespace DirectX
             // Returns size_t(-1) to indicate an out-of-range error
 
         bool IsCubemap() const { return (miscFlags & TEX_MISC_TEXTURECUBE) != 0; }
-            // Helpers for miscFlags
+            // Helper for miscFlags
 
         bool IsPMAlpha() const { return ((miscFlags2 & TEX_MISC2_ALPHA_MODE_MASK) == TEX_ALPHA_MODE_PREMULTIPLIED) != 0; }
         void SetAlphaMode( TEX_ALPHA_MODE mode ) { miscFlags2 = (miscFlags2 & ~TEX_MISC2_ALPHA_MODE_MASK) | static_cast<uint32_t>(mode); }
             // Helpers for miscFlags2
+
+        bool IsVolumemap() const { return (dimension == TEX_DIMENSION_TEXTURE3D); }
+            // Helper for dimension
     };
 
     enum DDS_FLAGS
diff --git a/DirectXTex/DirectXTexD3D11.cpp b/DirectXTex/DirectXTexD3D11.cpp
index e68c73d..70fbfac 100644
--- a/DirectXTex/DirectXTexD3D11.cpp
+++ b/DirectXTex/DirectXTexD3D11.cpp
@@ -30,7 +30,7 @@ static HRESULT _Capture( _In_ ID3D11DeviceContext* pContext, _In_ ID3D11Resource
     if ( !pContext || !pSource || !result.GetPixels() )
         return E_POINTER;
 
-    if ( metadata.dimension == TEX_DIMENSION_TEXTURE3D )
+    if ( metadata.IsVolumemap() )
     {
         //--- Volume texture ----------------------------------------------------------
         assert( metadata.arraySize == 1 );
@@ -378,7 +378,7 @@ HRESULT CreateTextureEx( ID3D11Device* pDevice, const Image* srcImages, size_t n
         return E_OUTOFMEMORY;
 
     // Fill out subresource array
-    if ( metadata.dimension == TEX_DIMENSION_TEXTURE3D )
+    if ( metadata.IsVolumemap() )
     {
         //--- Volume case -------------------------------------------------------------
         if ( !metadata.depth )
diff --git a/DirectXTex/DirectXTexMipmaps.cpp b/DirectXTex/DirectXTexMipmaps.cpp
index d363d84..ff08a0a 100644
--- a/DirectXTex/DirectXTexMipmaps.cpp
+++ b/DirectXTex/DirectXTexMipmaps.cpp
@@ -2644,7 +2644,7 @@ HRESULT GenerateMipMaps( const Image* srcImages, size_t nimages, const TexMetada
     if ( !srcImages || !nimages || !IsValid(metadata.format) )
         return E_INVALIDARG;
 
-    if ( metadata.dimension == TEX_DIMENSION_TEXTURE3D
+    if ( metadata.IsVolumemap()
          || IsCompressed( metadata.format ) || IsVideo( metadata.format ) )
         return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
 
@@ -2953,7 +2953,7 @@ HRESULT GenerateMipMaps3D( const Image* srcImages, size_t nimages, const TexMeta
     if ( filter & TEX_FILTER_FORCE_WIC )
         return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
 
-    if ( metadata.dimension != TEX_DIMENSION_TEXTURE3D
+    if ( !metadata.IsVolumemap()
          || IsCompressed( metadata.format ) || IsVideo( metadata.format ) )
         return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );