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Bruno Levy

@BrunoLevy01

Mar 10, 2022 • 12 tweets • 5 min read • Read on X

Scrolly

What's that ?
The raw scanner data for armadillo.
Can we reconstruct the armadillo from it ?

Step 1: Filter outliers

Step 2: smooth a bit

Step 3: Co3Ne reconstruction
(Surface reconstruction by computing restricted Voronoi cells in parallel, Dobrina Boltcheva and Bruno Lévy, Computer Aided Design - hal.inria.fr/hal-01596553/)

Step 4: Remesh with Voronoi Linear Parallel Enumeration

Step 5: texture atlas with ABF++ (hal.inria.fr/inria-00105689)

Step 6: bake normals from highres mesh using AABB

The normal map

Last but not least: #geogram up to date
github.com/BrunoLevy/geog…
The built-in geobox program has all these functionalities.
Geogram, a career-long reproducible science experience !

Ooohhh, there is also this one !

Since Co3Ne uses the original points, it can reconstruct details I did not see before in the "official" reconstructions !

Try it "at home" !
graphics.stanford.edu/data/3Dscanrep/
#geogram / geobox can now directly load ".conf" files
github.com/BrunoLevy/geog…

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More from @BrunoLevy01

Bruno Levy

@BrunoLevy01

Apr 26

Simulation of Monge-Ampère gravity in a 60 Mpc/h cube, 256^3 particles, z=5.
Article:

with Yann Brenier and @MohayaeeR arxiv.org/abs/2404.07697

Monge-Ampère gravity (right half) creates more abundant and more diffuse filaments as compared to 𝚲CDM (left half) where filaments appear to be more fragmented.

Larger simulation, with 100 million particles, in a volume of 300 Mpc/h^3. At z=5 there is not much difference...

Read 8 tweets

Bruno Levy

@BrunoLevy01

Apr 4, 2023

1/N
Have you every wondered how a microprocessor works ? How many sheets of paper do you need to write the schematics or description of a processor ? How many years do you need to study before being able to design your own processor ? How much money does it cost to try that ?

2/N
>Yes;1;0.05;$50
>What's that ?
>Answers to the questions in the previous post

3/N
Want to know more ?

Read 168 tweets

Bruno Levy

@BrunoLevy01

Jan 9, 2023

#geogram #geometry #programming
Hello darkness my old friend ...
Diving into exact triangle intersection code, that is exactly bugged !
Revisiting the whole approach, hopefully much much simpler in the end

You may think that once you have exact predicates it is piece of cake, but there is a surprisingly long list of particular cases: trlgs can be in the same plane, touch along a vrtx, an edge, isect can be a single point, a segment, a little triangle, it can even be a hexagon !

Seeing some light at the end of the tunnel... Seems that a reasonably short program can handle all the cases (but it does not fit in the margin, euuu I mean in a tweet !)

Read 6 tweets