Small changes to images as planes:

*Use absolute as default size mode (dpi with BU is not that nice).
*Use default plane primitive instead of creating our own square (this way we can be sure things like verts order will always match those of default plane!), request from Christopher Barrett in tracker.

io_import_images_as_planes.py

@@ -19,7 +19,7 @@
 bl_info = {
     "name": "Import Images as Planes",
     "author": "Florian Meyer (tstscr), mont29, matali",
-    "version": (1, 8),
+    "version": (1, 9),
     "blender": (2, 66, 4),
     "location": "File > Import > Images as Planes or Add > Mesh > Images as Planes",
     "description": "Imports images and creates planes with the appropriate aspect ratio. "
@@ -214,7 +214,7 @@ class IMPORT_OT_image_to_plane(Operator, AddObjectHelper):
         ('DPI', "Dpi", "Use definition of the image as dots per inch"),
         ('DPBU', "Dots/BU", "Use definition of the image as dots per Blender Unit"),
     )
-    size_mode = EnumProperty(name="Size Mode", default='DPI', items=_size_modes,
+    size_mode = EnumProperty(name="Size Mode", default='ABSOLUTE', items=_size_modes,
                              description="How the size of the plane is computed")
 
     height = FloatProperty(name="Height", description="Height of the created plane",
@@ -369,29 +369,24 @@ class IMPORT_OT_image_to_plane(Operator, AddObjectHelper):
             px = py = 1
 
         if self.size_mode == 'ABSOLUTE':
-            y = self.height / 2
+            y = self.height
             x = px / py * y
         elif self.size_mode == 'DPI':
-            fact = 1 / self.factor / context.scene.unit_settings.scale_length * 0.0254 / 2
+            fact = 1 / self.factor / context.scene.unit_settings.scale_length * 0.0254
             x = px * fact
             y = py * fact
         else:  # elif self.size_mode == 'DPBU'
-            fact = 1 / self.factor / 2
+            fact = 1 / self.factor
             x = px * fact
             y = py * fact
 
-        verts = ((-x, -y, 0.0),
-                 (+x, -y, 0.0),
-                 (+x, +y, 0.0),
-                 (-x, +y, 0.0),
-                 )
-        faces = ((0, 1, 2, 3), )
-
-        mesh_data = bpy.data.meshes.new(img.name)
-        mesh_data.from_pydata(verts, [], faces)
-        mesh_data.update()
-        object_data_add(context, mesh_data, operator=self)
+        bpy.ops.mesh.primitive_plane_add('INVOKE_REGION_WIN')
         plane = context.scene.objects.active
+        # Why does mesh.primitive_plane_add leave the object in edit mode???
+        if plane.mode is not 'OBJECT':
+            bpy.ops.object.mode_set(mode='OBJECT')
+        plane.dimensions = x, y, 0.0
+        bpy.ops.object.transform_apply(scale=True)
         plane.data.uv_textures.new()
         plane.data.materials.append(material)
         plane.data.uv_textures[0].data[0].image = img