Shoelast

[microelly2]

sculpter prototype - mouse interaction to add/subtract material on a surface
running on a helper mesh the interaction time is acceptable, the calcualtion of the nurbs takes more time and can be executed as last step for a high quality surface.
this is the first version on a planar surface.

phpBB [video]

[microelly2]

bp_759.png (165.5 KiB) Viewed 1925 times

smoothing the mesh with taubin
https://graphics.stanford.edu/courses/c ... othing.pdf
https://www.freecadweb.org/wiki/Mesh_Smooth

[triplus]

Getting there. One step at a time.

P.S. I guess two steps this time!

[microelly2]

Here is the workflow from last scan to smoothed ribs.

phpBB [video]

there are two possibilities to smooth the scan:
a) smooth the whole mesh https://www.youtube.com/video_id=uS2zYlrolSs
b) smooth each segment individually https://youtu.be/0dgZKYTk-Ck

for our testdata taubin smooth is good enough.

[microelly2]

bp_765.png (12.14 KiB) Viewed 1818 times

I have added a distance indicator.
It displays a scaled difference between scanned point and smooth point.
from here it is easier to see the areas where the change improves the model and where we have to do some rework.

[microelly2]

bp_768.png (431.63 KiB) Viewed 1778 times

vectorfield of the smooth change on a surface (scaled)
read means add material
blue subtract material

[triplus]

Looks like something appropriate for winter time.

[microelly2]

the simulation of global warming
from the polar bear to the hippopotamus

[microelly2]

Split the periodic Nurbs (blue) into 3 segments
The idea behind is to have a method from a closed surface to an open one.

bp_793.png (221.29 KiB) Viewed 1698 times

in the next step the individual segments can be recombined to the tip or the rear of the shoe.
(or to model a tongue or other overlapping details)

phpBB [video]

phpBB [video]

[microelly2]

To connect the top of the shoe with the middle part we use leastsq optimizing to place the pieces together when the do not fit exactly.
In the next step the borders must be merged.

phpBB [video]