[SoC] GSoC 2020 - Coding Period Week 5 Report
BELGACEM NEDJIMA
gb_nedjima at esi.dz
Sun Jul 5 06:07:49 PDT 2020
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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