Photogrammetry
with
Phones
Meetup 3
Have you tried a scan, yet?
Lets look at some Models
(Scaniverse)
Week 3
Polycam
Remesh
Common Problems
Holes,
Geometry
Focus
Tool Tips
for larger objects
Next Assignment: Larger Objects
MJ: Market Leader
iOS & Android
Free! - but limitations (150 photos, 5 captures)
7-day free trial for BASIC, but
keen to trap you into subscription
Web site storage
Video: Polycam Lidar vs Photo Modes
Advantages of 'Basic'
- More photo input
- Object isolation
- Splats
- REMESH
Polycam Web
Mark's scan of an
Iron Age/Roman
Rotary Quern
(pudding stone)
REMESH
(see video)
Original
Mesh:
139,000 polygons
Texture:
4k X 4k pixels
.glb file size : 6,900 KB
(approx half as mesh;
half as texture)
REMESH
choices
Original Decimated
Advice
Common Issues
Avoid shiny, reflective,
transparent
Light evenly
Circle object several times
Don't move object
Why?
Camera Calculations
Shadows
baked in
Redundancy
Better texture?
Whole scene capture
Tricky Geometry/
Poor Angles
See model
Fixes?
Plan your shoot
Selfie-Sticks
Focus
Fixes?
Initial focus &
tap on screen to re-focus
during shoot
Fill the Screen
Fixes?
Move closer
Q&A
Questions so far?
Next: Scanning Large Objects
Tool Tips
Light-weight Tripod
acting as selfie stick
Monopod
See model
S
Making a Large Scan
Video: Scaniverse: Testing a 3D Scanning App
Note: He makes a mistake when choosing SIZE
(see if you can spot it)
Next meeting is 'small object capture'
Size
Assignment
Make at least one larger model using:
Scaniverse
Upload to Sketchfab
Turn-in link via Discord
Next meeting is 'small object capture'
DO
Pick a larger object
(car-sized or above)
Plan your circling & heights
Maybe, use selfie-stick for reach
DON'Ts
Get too close to your object
be surprised if people ask "WHAT are you doing?"
TanitXRweek3
By Mark Jeffcock
