3D Machine Animation: What CAD Files You Need

Every 3D machine animation starts with geometry. The single question that decides how long a project takes — and what it costs — is what you already have. This is what we can work from, in order of how quickly it gets us moving.

The ideal: native 3D CAD

If your design team works in SolidWorks, Inventor, Creo, NX or Solid Edge, send the native assembly. We can open it, keep the assembly tree intact, and animate the real motion of the real parts. Nothing has to be rebuilt and nothing gets approximated.

What matters more than the format is that the assembly is complete enough to move. A machine modelled as a single fused solid looks right in a render but cannot be exploded, sectioned or animated. If your model has mates and sub-assemblies, keep them.

The practical: a neutral 3D file

STEP (.stp/.step), IGES and Parasolid are all fine. These lose the parametric history but keep the geometry, which is what an animation needs. STEP is the most reliable of the three and the one we ask for when a client cannot share native files for IP reasons.

One caution: neutral exports often arrive with every fastener, washer and internal rib included. A 40,000-part export of a full plant will open, but it will not render efficiently. We simplify it — stripping geometry that is never visible — before animating. That is normal preparation work, not a problem with your file.

The common reality: 2D drawings only

Most enquiries we receive are for machines that were designed before 3D CAD became standard in the business, or where the 3D data sits with a supplier who will not release it. A dimensioned general arrangement drawing is enough. So is a fabrication drawing set.

We build the 3D model from those drawings and send it to you for approval before any animation begins. That approval step matters — it is much cheaper to correct a wrong bracket in the model than in a finished render.

The fallback: photographs and a tape measure

If no drawings exist at all, we have built accurate models from photographs plus a handful of key dimensions. Overall length, height, width, and the diameter of one or two recognisable components are usually enough to scale everything else correctly.

Take photographs from all four sides at roughly eye level, plus one from above if you can reach a platform. Avoid wide-angle phone lenses close up — they distort proportions and make the model harder to get right.

What else to send with the geometry

Colours and finishesRAL numbers if you have them, or a photograph of the painted machine. Guessing a shade of blue is the most common avoidable revision.

Nameplates and decalsYour logo as vector artwork, and any panel graphics. These are what make a render look like your machine rather than a generic one.

The sequence you want shownWhich parts move, in what order, and what the viewer should understand by the end. A rough sketch or a voice note is fine.

Where it will be usedExhibition loop, tender document, website, or operator training. This changes the length, the aspect ratio and the level of detail.

What you do not need to prepare

You do not need to clean up the model, delete parts, convert formats or write a script. Send what you have in whatever state it is in. Preparing engineering data for animation is our work, and doing it ourselves is faster than explaining what to remove.

What CAD Files Do You Need for a 3D Machine Animation?