Select Polygons By Angle

Select Polygons By Angle is built to handle geometry of any complexity, including models with millions of polygons, thanks to a high-performance caching engine. The core angle-based mode uses a flood-fill algorithm that spreads from the active polygon to adjacent ones as long as the angle between their normals stays within the set threshold. For quad-based meshes, its directional loop selection is designed for fast, predictable operation, and the header info display keeps the active mode, angle threshold, and tolerance visible while you work on dense models.

Select Polygons By Angle includes an interactive angle preview that displays, in real time, the precise angle between the normal of the polygon under the cursor and adjacent selected polygons. On the next selection operation, the addon can automatically use that measured angle, plus a configurable tolerance, as the new angle threshold. This automatic threshold calibration reduces the time spent on iterative parameter tweaking, so you avoid manual trial-and-error with angle thresholds. The preview can be triggered by a dedicated button or activated automatically.

Select Polygons By Angle offers a directional loop selection mode specialized for quad topology, designed for fast and predictable operation on quad-based meshes. From the active quad polygon, it initiates a loop search in horizontal and/or vertical directions. You control it with the main Enable Direction Mode option, refined by separate Horizontal Loop and Vertical Loop toggles. Alongside this, the Aggressive Expand option lets the flood-fill process ignore previously selected polygons as barriers, allowing the selection to grow through them.

Select Polygons By Angle groups all of its tools in a dedicated 3D CADence tab within Blender's N-Panel, keeping them accessible without cluttering the standard panels. A header info display dynamically shows the active mode, angle threshold, tolerance, and other key parameters. All of the addon's operators are also available for keymapping in Blender's preferences, so you can assign fully customizable hotkeys. In the viewport, contextual text at the cursor changes color and icon depending on the situation to give instant feedback.

Select Polygons By Angle is listed as free in this catalog. For current licensing details and any terms, check the developer's page, since availability can change over time. The addon comes from 3D CADence and runs inside Blender, grouping all its tools in a dedicated 3D CADence tab in the N-Panel. A demo video is also available, and its operators can be mapped to custom hotkeys through Blender's preferences if you want to tailor how you access each tool.