Point-cloud engraving is a method of creating images inside transparent material by placing many individual microscopic points in three-dimensional space. Each point is produced by a focused laser pulse that forms a tiny internal fracture. When viewed together, the points appear as a continuous image.

Unlike surface engraving, the laser does not remove material. The image exists entirely beneath the surface and becomes visible because light scatters from the internal points.

The appearance of the image depends on point density and spacing. Points placed too closely can cause internal fogging, while points placed too far apart reduce clarity.

Point-cloud engraving is commonly used for volumetric portraits in crystal and optical glass objects.

Cockpit3D is software used to generate point-placement data for this type of engraving.