Month: March 2021

You’ll never guess what this is

#3dscanner #photogrammetry #openmvs #colmap #blender

(Dropping a video for my archive on FB. Scroll past if it’s appearing in your feed for not the first time. The video has English comments)

(This video is about my 3D scanner project. I am just adding the video to my Facebook archive. If you saw it earlier, sorry, I don’t know how to add the video without having it exposed to the friends)

The first pancake is always lumpy, but at least the technology is now clear. You can’t fix the resolution and coarseness of PLA. Perhaps it was also affected by Masha unintentionally moving during the shoot. We need to try shooting with four cellphones, then there would be no need to stay still for so long. For small objects, the usefulness of a 3D scanner has become obvious. Taking pictures manually really doesn’t cut it.

Shouldn’t there be an apostrophe in the word RESTROOMS?

Only I could throw my back out installing this engine. What a dangerous hobby I have

I’ve started to slowly make a 3D scanner in a more proper form than just a cardboard cutout on an axis. Connected a motor, measured on wood, made three levels of mounts for the phone, printed parts on a 3D printer. The scanning process takes about a minute. Another hour goes into converting to 3D.

I wonder why no one has yet created a service that allows searching for videos (movies?), where people speak with the same voice tone (perhaps, in the same language) as the uploaded voice? Something like tineye, but for audio. All movies are digitized, we just need to find a way to identify the characteristics that make us think the voices are similar, and index them accordingly.

One night – and the bike light mount is ready. Almost always, instead of 3D printing, you can buy a ready-made solution like this light for 25 bucks. But the thrill of “I thought up and made it myself” cannot be bought for any money 😉 P.S. As for replacing this broken light, I bought a new one several weeks ago. So this will be the second one, too good to go to waste

The first swallow. Or I don’t even know, darn it. An attempt, partially successful, to create on a 3D printer an object that contours around part of the front panel of the car. Quite a complicated engineering task. I scanned the cast with a homemade scanner, but then the digital copy must be resized to the dimensions of the cast. It’s not trivial because there are no clear reference points. Well, here I seem to have hit the mark accurately, having to enlarge the digital copy by 8.3 times. Next, it’s important to consider that a millimeter error will lead to poor shrinkage. I slightly pushed through here, but pliers and a file….

I needed to scan a complex-shaped piece of a car’s interior for a home project. I’m currently making a papier-mâché mold, and while it dries, I decided yesterday to assemble a 3d scanner. It took an hour to create the scanner. It consists of a rotating platform (bearing) on which the camera (phone) captures the object from 360 degrees. This is a prototype; I’ll make a proper one later. For the test object, I chose a wooden mount from an easel.

My ancient 3D scanner gave me 500 photos from all sides, each with a resolution of 2160×2440. The processing was done on COLMAP (feature extractor, exhaustive matcher, mapper) and then on openMVS (reconstruction, triangulation, localization, refining, texture application). It took about 10 hours. I probably went overboard with the number of photos – for a 360-degree view, half of 500 would have been enough. There are artifacts due to the shooting being only in one plane. In the second version of the scanner, I will make the phone movable along a curved guide, and the object will be shot from different planes.

The scanner itself mainly consists of:

– a bearing

– a box

– packaging from a laptop

– packaging from a smartwatch

– kitchenware

– a pencil sharpener as a counterweight to the phone, so it doesn’t tilt the box due to the weight of the phone

– an iPhone 12 Pro Max. This is, actually, the most expensive component

This is what I ended up with. I’m also including a photo of the model itself for comparison. There’s also a video here where I rotate it.