diff --git a/source/MaterialXRender/ShaderRenderer.cpp b/source/MaterialXRender/ShaderRenderer.cpp
index 99f27c6b37..315d6fdca7 100644
--- a/source/MaterialXRender/ShaderRenderer.cpp
+++ b/source/MaterialXRender/ShaderRenderer.cpp
@@ -25,10 +25,11 @@ const float DEFAULT_FAR_PLANE = 100.0f;
 // ShaderRenderer methods
 //
 
-ShaderRenderer::ShaderRenderer(unsigned int width, unsigned int height, Image::BaseType baseType) :
+ShaderRenderer::ShaderRenderer(unsigned int width, unsigned int height, Image::BaseType baseType, ConventionAPI conventionAPI) :
     _width(width),
     _height(height),
-    _baseType(baseType)
+    _baseType(baseType),
+    _conventionAPI(conventionAPI)
 {
     // Initialize a default camera.
     float fH = std::tan(DEFAULT_FIELD_OF_VIEW / 360.0f * PI) * DEFAULT_NEAR_PLANE;
@@ -36,11 +37,14 @@ ShaderRenderer::ShaderRenderer(unsigned int width, unsigned int height, Image::B
     _camera = Camera::create();
     _camera->setViewMatrix(Camera::createViewMatrix(DEFAULT_EYE_POSITION, DEFAULT_TARGET_POSITION, DEFAULT_UP_VECTOR));
 
-    #if defined (__APPLE__)
+    if (_conventionAPI == ShaderRenderer::ConventionAPI::METAL)
+    {
         _camera->setProjectionMatrix(Camera::createPerspectiveMatrixZP(-fW, fW, -fH, fH, DEFAULT_NEAR_PLANE, DEFAULT_FAR_PLANE));
-    #else
+    }
+    else // ConventionAPI::OPENGL (default)
+    {
         _camera->setProjectionMatrix(Camera::createPerspectiveMatrix(-fW, fW, -fH, fH, DEFAULT_NEAR_PLANE, DEFAULT_FAR_PLANE));
-    #endif
+    }
 }
 
 void ShaderRenderer::createProgram(ShaderPtr)
diff --git a/source/MaterialXRender/ShaderRenderer.h b/source/MaterialXRender/ShaderRenderer.h
index 2c6f5fbf87..53f35bb072 100644
--- a/source/MaterialXRender/ShaderRenderer.h
+++ b/source/MaterialXRender/ShaderRenderer.h
@@ -30,6 +30,12 @@ using ShaderRendererPtr = std::shared_ptr<class ShaderRenderer>;
 class MX_RENDER_API ShaderRenderer
 {
   public:
+    /// API viewing conventions designation (default to OpenGL).
+    enum class ConventionAPI
+    {
+        OPENGL = 0,
+        METAL  = 1
+    };
     /// A map with name and source code for each shader stage.
     using StageMap = StringMap;
 
@@ -123,13 +129,16 @@ class MX_RENDER_API ShaderRenderer
     /// @}
 
   protected:
-    ShaderRenderer(unsigned int width, unsigned int height, Image::BaseType baseType);
+    ShaderRenderer(unsigned int width, unsigned int height, Image::BaseType baseType,
+        ConventionAPI conventionAPI = ConventionAPI::OPENGL);
 
   protected:
     unsigned int _width;
     unsigned int _height;
     Image::BaseType _baseType;
 
+    ConventionAPI _conventionAPI;
+
     CameraPtr _camera;
     ImageHandlerPtr _imageHandler;
     GeometryHandlerPtr _geometryHandler;
diff --git a/source/MaterialXRenderGlsl/GlslRenderer.cpp b/source/MaterialXRenderGlsl/GlslRenderer.cpp
index e81ded996e..982ea230e4 100644
--- a/source/MaterialXRenderGlsl/GlslRenderer.cpp
+++ b/source/MaterialXRenderGlsl/GlslRenderer.cpp
@@ -25,7 +25,7 @@ GlslRendererPtr GlslRenderer::create(unsigned int width, unsigned int height, Im
 }
 
 GlslRenderer::GlslRenderer(unsigned int width, unsigned int height, Image::BaseType baseType) :
-    ShaderRenderer(width, height, baseType),
+    ShaderRenderer(width, height, baseType, ConventionAPI::OPENGL),
     _initialized(false),
     _screenColor(DEFAULT_SCREEN_COLOR_LIN_REC709)
 {
diff --git a/source/MaterialXRenderMsl/MslRenderer.mm b/source/MaterialXRenderMsl/MslRenderer.mm
index 284aabbb8f..0cd5720656 100644
--- a/source/MaterialXRenderMsl/MslRenderer.mm
+++ b/source/MaterialXRenderMsl/MslRenderer.mm
@@ -29,7 +29,7 @@
 }
 
 MslRenderer::MslRenderer(unsigned int width, unsigned int height, Image::BaseType baseType) :
-    ShaderRenderer(width, height, baseType),
+    ShaderRenderer(width, height, baseType, ConventionAPI::METAL),
     _initialized(false),
     _screenColor(DEFAULT_SCREEN_COLOR_LIN_REC709)
 {