idefix/doc/voxels.md

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Documentation and developer's notes on voxels in IDEFIX package.
Voxels data
---
- Density
- Distribution
+ Mean
+ Variance
+ Mode
+ Entropy
+ Min
+ Max
+ Quantil
Voxels glossary
---
- Step, resolution, bins...
Algorithm
---
### Mode
Insight and warn when use with high entropic data.
- Slow (usual mode)
- Quick (versus boost)
Ideas
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- Unified voxel format
+ Do not store complete matrix
* Point cloud like to benefit of PC IO for import/export.
* Matrices always start to 0,0,0 image like, need metadata (start,
steps, dtypes, field names...)
+ Allow matrice aumgentation