Although I'm still early on in my journey learning photogrammetry, I've already had a few road bumps and memory fails while shooting and converting my subjects into useable 3d meshes. These pitfalls have lost me time and sometimes left me in repetitive bewilderment constantly relearning the same lessons. So, I've decided it would be a good idea to start keeping a more public log of the learning experience, hopefully a few others can avoid my mistakes and I'm planning to use this as a way for me to monitoring my own progress.
These posts are meant to be shared lessons, and progress updates that may be beneficial to others trying to pick up hobby level photogrammetry. These are not meant to be full tutorials or lessons, in fact I plan to post at least a few Null Result tests as a way of showcasing some unsuccessful ways of doing this. I hope the journey helps others get better capture sessions. Feel free to reach out with any questions or feedback. I'll attempt to share useful links and tutorials I found helpful along the way.
Technical Details/References:
I'm using a Sony A6300 mirrorless camera to capture these as well as meshroom/blender.
Sony Alpha a6300: APS-C sensor dimensions: 23.5 x 15.6 mm - Sensor area: 366.60mm2 -- This is useful as we do a deeper dive into what the first principles of photogrammetry we will want to start recognizing how we are obtaining certain bits of information from our data sets.
Guidelines for capturing from Meshroom's official page:
Basics
Your scene/object should be well lit.
Avoid shadows, reflections, and transparent objects.
Take the photos in diffuse or indirect lighting, such as on an overcast day (outdoor) or using multiple light sources (indoor).
Don´t use the flash setting on the camera.
Do not change the focal length/zoom while shooting. Use a fixed focal length lens if possible.
Try to take pictures from all angles.
Avoid moving objects in the scene or background.
If taking pictures using a rotating rig, make sure to use a plain color background with no distiguishable features.
The object of interest should always fill most of the image.
Take images with a side overlap of 60% minimum and frontal overlap of 80% minimum.
For each shot, move to a new position (or rotate the object).
Do not take multiple images from the same spot.
For better coverage, you can photograph an area multiple times in different acquisition patterns.
Avoid shaky, blurry, or warped images.
The more images you have, the better. You can always filter out repetitive or poor quality images to reduce processing time.