2D vs 2.5D vs 3D Pop vs 3D 360

We come across several engraving methods described as 3D, but it's important to note that not all of them produce the same type of results. What truly sets these methods apart from each other is how and where the lasers place the image markings in relation to the material's surface.

Once you understand this, it becomes easier for you to explain why some engravings look flat while others look as if they are floating inside the crystal.

2D Engraving (Surface Image)

2D Engraving is where the laser marks only on the surface of the object. The image or text is formed from several lines or dots engraved by the laser and sits on the outer surface of the material.

• There is no real physical depth to the engraving that you can see or feel
•  It is meant to be viewed from a single angle
•  It is more like printing on the surface rather than 3D engraving even though its within the crystal.

2.5D Engraving (Relief Carving)

In 2.5D engraving, there is an additional depth to the engraving rather than plain 2D. But it still stays attached to the surface of the engraved object. Here, the laser removes more material in the darker areas of the image and less in the lighter areas, creating a slight perception of depth and dimension.

• Depth varies across the surface with respect to the dark and light parts of the image
• Shadows help create the illusion of dimension in the engraving
• The engraving is still on the surface of the object and not inside it.

3D Pop (Front‑Focused Model)

3D Pop engraving builds depth mainly at the front and the sides of the subject. It looks incredibly lifelike and real from the main angle of view. The image appears to project outward, but it isn’t a full sculpture.

•  It is designed for frontal viewing as the image pops out at the front.
•  This is a great option for realistic portraits.
• It gives approximately 180° visible details of the image meaning it includes profiles. 

3D 360 (Full Model)

3D 360 engraving captures the complete subject as a fully formed object. It can be viewed from all angles to see different sides of the subject. This model contains complete geometry all the way around, just like a digital sculpture.

• Complete geometry around the subject can be viewed.
• Visible from all directions, giving a different view of different sides.
• It is created using full 3D modelling.

Volumetric Engraving (Subsurface Image)

Volumetric engraving works completely differently from other engravings discussed so far. Here, instead of engraving the surface, the laser burns tiny points at different depths inside a transparent material. This leaves the outside of the material untouched while the image forms inside it.

• The image looks like it is floating inside the object.
• Image is visible from multiple viewing angles
• The image is created from point-cloud data generated from the 2D flat image file.

Software such as Cockpit3D converts plain 2D photographs into the point-placement data required for volumetric engraving.Visual Comparison

Visual Comparison

Why the Difference Matters

A photograph doesn’t have any depth aspect to it. Some engraving methods try to induce depth, while others try to reconstruct it.  If the laser places points in depth space, the result appears three-dimensional.

In many cases, the preparation method has a bigger impact on the final appearance of the engraving than the laser itself.

Summary

Not every method labeled “3D engraving” creates the same output. Each style of engraving relies on a different data representation.  Surface engraving, relief carving, partial 3D modeling, and full modeling, each have their own type of input data and differ by the output produced.