We were having a lot of trouble using the measure tool in Blender — after discovering that you can hold the Ctrl key and “snap” your selection to a vertex, it actually worked in the way we wanted it to. But, before that discovery, my thought was to manually select two vertices and use a Python script to measure the distance between those points. That is “blender units” … and the metric or imperial units would be more meaningful. So I converted based on the scene configuration. <\/p>\n\n\n
\nimport bpy\nimport bmesh\n\n\ndef format_metric(meters: float) -> str:\n a = abs(meters)\n\n if a >= 1.0:\n return f"{meters:.6f} m"\n elif a >= 0.01:\n return f"{meters * 100.0:.3f} cm"\n else:\n return f"{meters * 1000.0:.3f} mm"\n\n\ndef format_imperial(meters: float) -> str:\n total_inches = meters \/ 0.0254\n sign = "-" if total_inches < 0 else ""\n total_inches = abs(total_inches)\n\n feet = int(total_inches \/\/ 12)\n inches = total_inches - (feet * 12)\n\n if feet > 0:\n return f"{sign}{feet} ft {inches:.3f} in"\n else:\n return f"{sign}{total_inches:.3f} in"\n\n\ndef measure_selected_vertices():\n ctx = bpy.context\n obj = ctx.edit_object\n\n if obj is None or obj.type != 'MESH':\n raise RuntimeError("Go into Edit Mode on a mesh and select exactly 2 vertices.")\n\n bm = bmesh.from_edit_mesh(obj.data)\n selected_verts = [v for v in bm.verts if v.select]\n\n if len(selected_verts) != 2:\n raise RuntimeError(f"Expected exactly 2 selected vertices, found {len(selected_verts)}.")\n\n v1, v2 = selected_verts\n\n # Convert local vertex coordinates to world-space coordinates\n p1 = obj.matrix_world @ v1.co\n p2 = obj.matrix_world @ v2.co\n\n # Raw world-space distance in Blender units\n raw_distance = (p2 - p1).length\n\n scene = ctx.scene\n units = scene.unit_settings\n scale_length = units.scale_length if units.scale_length != 0 else 1.0\n\n # Convert Blender units to meters according to the scene unit scale\n distance_meters = raw_distance * scale_length\n\n print("\\n----- Vertex Distance -----")\n print(f"Object: {obj.name}")\n print(f"Raw distance (Blender units): {raw_distance:.6f}")\n print(f"Scene unit system: {units.system}")\n print(f"Scene unit scale: {scale_length}")\n\n if units.system == 'METRIC':\n print(f"Formatted distance: {format_metric(distance_meters)}")\n\n elif units.system == 'IMPERIAL':\n print(f"Formatted distance: {format_imperial(distance_meters)}")\n\n else:\n print("Formatted distance: Scene unit system is 'NONE'")\n print(f"Interpreted using current unit scale: {format_metric(distance_meters)}")\n\n\nmeasure_selected_vertices()\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"We were having a lot of trouble using the measure tool in Blender — after discovering that you can hold the Ctrl key and “snap” your selection to a vertex, it actually worked in the way we wanted it to. But, before that discovery, my thought was to manually select two vertices and use a …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2163],"tags":[2158,2182,2177,664],"class_list":["post-12146","post","type-post","status-publish","format-standard","hentry","category-blender-3d-printing","tag-blender","tag-blender-api","tag-bpy","tag-python"],"_links":{"self":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/12146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12146"}],"version-history":[{"count":1,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/12146\/revisions"}],"predecessor-version":[{"id":12147,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/12146\/revisions\/12147"}],"wp:attachment":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}