[QGIS-Developer] [SoC] GSoC 2020 - Coding Period Week 5 Report

[Luca Manganelli]

Nice job! You are really fast in coding :-)

Il giorno dom 5 lug 2020 alle ore 15:08 BELGACEM NEDJIMA <gb_nedjima at esi.dz>
ha scritto:

> Hi all,
> During the fifth week of the summer of code I made a lot of progress
> implementing the 3D scenes export feature. Here is my report for the week:
>
>
>    -
>    - Tasks done:
>       - Got exporting the vector layer data working.
>       - Saw how the flat terrain is generated and how the level of
>       details system works.
>       - Exported visible terrain tiles by taking the
>       Qt3DRender::QAttribute objects directly and parsing the data.
>       - Exported invisible terrain tiles by generating geometries
>       manually.
>       - Exported DEM terrain tiles (I had some troubles with non square
>       height maps giving me wrong values but I eventually fixed the problem).
>       - Discovered smooth edges parameter in the wavefront .obj standard
>       and implemented it (I'm following this very useful spec obj-spec
>       <http://fegemo.github.io/cefet-cg/attachments/obj-spec.pdf>)
>       - Gave the user the ability to choose at which level of details he
>       wants to export.
>       - Made initial UI and classes for the scene export settings.
>       - Switched from the user specifying the level of details to
>       specifying the resolution of the terrain (more predictable in terms of
>       loading speed and vertex count).
>       - Made a separate class named Qgs3DExportObject that will handle
>       the object name and various 3D data (to handle absence of texture
>       coordinates data in a better way in the future).
>       - Gave each object in the scene it's own object name in the .obj
>       file so that blender users can edit the scene in a better way.
>       - Documented the code and made a draft pull request that you can
>       find here: https://github.com/qgis/QGIS/pull/37588
>       - Discussed what I implemented with mentors.
>    - Screenshots:
>       - DEM terrain inside QGIS: https://imgur.com/aZl0E03
>       - Exported DEM terrain (smoothing option to the left):
>       https://imgur.com/Jkl9kfu
>       - Exported vector layer with a flat terrain:
>       https://imgur.com/LWBtHqf
>    - Tasks to be done:
>       - Export other types of layers (mesh layers, 3D symbol layers...).
>       - Handle exporting of normals.
>       - Handle exporting of texture coordinates.
>       - Export textures as displayed in the scene to an image file.
>       - Manage material file (.mtl) construction.
>    - Blocking issues: Not really a blocking issue but I wanted to do
>       export scene hierarchy in the .obj file but that didn't seem to work in
>       blender :(.
>
> Any suggestion or feedback is always welcome.
> Best wishes,
>
> --
> Belgacem Nedjima
> 4th year computer science and engineering student.
> https://github.com/NEDJIMAbelgacem
>
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-- 
Luca Manganelli
Assistente informatico
Servizio Innovazione e Sistemi digitali
Via Ezio Maccani 148
38121 Trento (TN)

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