CalloutTag: Numbered 3D callouts for Blender, ready for the web

Numbered 3D callouts with leader lines, ready for GLB and the web.

Click a point on your model and get a numbered badge, a leader line and a label. Callouts follow the model, render in Cycles and Eevee, and export to GLB with a JSON file your web viewer can read directly.

Main features

1. Callouts in one click

• Edit Mode: select a vertex, edge or face, then click Add Callout. The callout is placed at the center of the selection and points along the surface normal.
• Object Mode: place the 3D cursor on the model, then click Add Callout. It snaps to the surface automatically.
• Numbered badge, leader line and label on a clean backplate.
• Text goes on the side the leader points to, so it never crosses the line.

2. Easy to arrange

• Move a label anywhere: click its number, press G, then click Update.
• Callouts are attached to the model, so moving or animating it moves them too.
• Reorder with ▲▼; numbers update automatically. Renumber closes the gaps.
• Edit labels and descriptions directly in the list.

3. Always readable

• Labels face the viewport, the camera (for renders) or the front view.
• Auto Size scales callouts to the model, from a small part to a whole machine.
• Callouts cast no shadows, so they stay clean in renders.

4. Built for the web

• Export GLB + JSON: the model, its callouts and a .callouts.json file with each callout's number, label, description, anchor position, normal and label position, in glTF coordinates.
• Callout data is also stored in the GLB itself (glTF extras).
• Include Label Geometry can be turned off if your web app draws its own HTML labels. You still keep the anchor points and the data.
• Works with Three.js, Babylon.js, <model-viewer> and any glTF viewer.

Style options: badge, text, leader and line sizes; badge, number, text, backplate and line colors; label text and backplate on/off.

Compatibility: Blender 4.2 or newer (tested on 5.0), Windows, macOS and Linux. GPL license.

Use cases: technical documentation, assembly and maintenance instructions, product pages, 3D configurators, exploded views, training material, presentations.