When referring to the mesh geometry – its vertices, edges, and polygons, Blender operates with the original data without the usage of modifiers added to the object.
For example, the number of vertices of the active object, we can get with the following command:
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len(bpy.context.active_object.data.vertices) |
And it will be returned without considering the object’s Subdivision modifier, which modifies the mesh’s geometry, increasing it.
In order to navigate to an URL-address from Blender – to open the required address in the browser, we can use the system operator “wm.url_open”.
To demonstrate this let’s create a simple tab in the N-panel with a single button, by clicking on which the required page will be opened in the browser.
To have the access to the current context, for example, to work with operators, and to the scene data, for example, to work with meshes, we use two predefined structures from the Blender Python API: “bpy.context” and “bpy.data”.
For example, we can pass them to a function:
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import bpy def my_func(context, scene_data): print(context, scene_data) my_func( context=bpy.context, scene_data=bpy.data ) # <bpy_struct, Context at 0x00000000050EF568> <bpy_struct, BlendData at 0x0000000007FA6408> |
However, in the “bpy.context” structure there is a “blend_data” pointer that links to the scene data. With this pointer, we can access scene data without passing it separately and explicitly.
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import bpy def my_func(context): print(context, context.blend_data) my_func( context=bpy.context, ) # <bpy_struct, Context at 0x00000000050EF568> <bpy_struct, BlendData at 0x0000000007FA6408> |
In Blender, we can select and deselect mesh vertices through the “select” property for each vertex.
However, to deselect a vertex, it is not enough to set it’s “select” property to “False”
If you want your add-on to be available for all Blender users around the world, you need to make the localization – translation of its interface into different languages.
The simplest way to make your add-on multilingual is the classic way, it is used in many other programs and requires the minimal usage of the Blender Python API.
