What Is Photogrammetry?

photogrammetry is just the collection of precise information about structures or environments based on numerous image inputs.

How Does It Work?

photogrammetry uses 3D geometry information and formulas e.g. the camera positions, its intrinsic parameters, and rays intersections to create the mesh.

What Is Meshroom?

Meshroom is a free, open-source photogrammetry software that is based on the AliceVision framework. With the help of that , you can generate a 3D model using ample images of an object taken from different angles. The software calculates the distance between surface points and creates an object mesh

What about the Workflow?

To do the photogrammetry , you’ll need to take as much as photographs of the object that you want the 3d mesh to be created.

Acquiring the Perfect Image

good pictures will generate good models. Getting the picture just right is the key to successful Meshroom photogrammetry. When taking images of an object or a scene, you need to keep in mind some variables that could affect the overall quality of the final images.

Weather
Shooting time
Size of subject or area
Light: how much of it there is, etc.
Shadows on objects

In addition, it is advised to use a stable setup to take the pictures e.g. a tripod in order to get perfect pictures. And for the settings of the camera use a higher f-number, and a faster shutter speed.

“Photographs taken for Our Ganaraya Photoscan”

What Does Meshroom’s Workflow Look Like?

Importing images into Meshroom is simply a drag & drop from your images folder into Meshroom. Your Meshroom projects will be saved in a folder called MeshroomCache.

And that’s pretty much it! Meshroom will go through your images’ metadata to ensure they are all in order and get to work processing and generating the 3D model after hitting start. In case the uploaded images have no metadata, there is an option to add the metadata manually to the images.

Whatever is uploaded is automatically opened in Meshroom’s UI. You can then go through it in more detail and see what images correspond to what location on the 3D scan. The examination of individual images in the 3D scan gives you more control and a better idea of what looks good and what doesn’t.