3D scans using photogrammetry

Sometimes it can save you a lot of time to make a 3D scan of an object instead of modeling it from scratch. In this post we’re going to make a 3D scan of a small object.

Requirements

  • a decent camera
  • a photo box (mini studio)
  • a turntable
  • Agisoft Photoscan Standard
  • Adobe Photoshop
  • 3D modeling software

In my first attemps at 3D scanning I did not use a photobox. The results were not great. So I really recommend using a photo box (mini studio). I use this one (Caruba Portable Photocube LED) myself and am quite happy with it as the included LED lights make life very easy.

As we require pictures from all angles and it’s not possible to walk around the object when using a photo box, we need a turn table. A simple turntable for making cakes will do fine. I use this one.

We’re going to place the object on the turn table in the photo box and make pictures from different sides of the object. It’s also important to vary the high of the camera. In my case I made 178 pictures of the object. The pictures will look like this.

I tried to use Agisoft with these pictures, but the results were mehhh. So what I did was using Photoshop to create masks. The pictures now looked like this.

Agisoft can create a camera alignment and the result will look like this.

If everything is OK, Agisoft can create a sparse point cloud. If this looks OK, it can create a dense point cloud and a mesh. This mesh can be imported in 3D modeling software, like Blender, Cinema 4D or Maya.

In the results below I’ve added a virtual Voronoi frame around the mill and changed the material of the mill.

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