Check for transparent textures on render

PartPreviewWindow/View3D/MeshViewerWidget.cs

@@ -469,6 +469,7 @@ namespace MatterHackers.MeshVisualizer
 				}
 
 				if (drawColor.alpha == 255
+					|| item.Mesh.FaceTexture.Where((ft) => ft.Value.HasTransparency).Any()
 					|| isDebugItem)
 				{
 					// Render as solid

Submodules/agg-sharp

@@ -1 +1 @@
-Subproject commit a667d45e29adc5e74fcd71bc35fedad28d858601
+Subproject commit 2e011242b083bf6ebdc723dc5768a85ac6b8227d