mesh files use game space (right-handed, y up): obj/gltf import and export no longer mirror models, per-mesh handedness keeps meshes of old projects as they were, python tools follow (--export-space for the old files)

notes/levelbau.md

@@ -265,8 +265,8 @@ X display → own `Xvfb :7` (never :0, :5 belongs to lamatest). Procedure (scrip
 1. `geom_export.py out/testwelt.wad GE` → level.obj/mtl + page_NN.png
 2. Strat positions: run the level script with `levelbuild.Level` (without `L.build`), `L.strats` as JSON
 3. `DISPLAY=:7 STRATS=strats.json VIEWS=schraeg,schraeg2,oben blender -b -P render_level.py -- GE r 64`:
-   own OBJ reader (the 3.0 importer does not know vertex colours), mirroring OBJ→game (y_blender =
-   −game z, flip winding), material = texture (closest) × vertex colour, a little emission,
+   own OBJ reader (the 3.0 importer does not know vertex colours), OBJ (= game space since
+   2026-11-07) → Blender z up (y_blender = −game z, winding kept), material = texture (closest) × vertex colour, a little emission,
    sun + sky, markers for strats (coins gold, llama start orange cone, gallery objects
    in row colour, animals white, exit purple ring); writes PNG + JSON per view with
    image coordinates of the area names.