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fix(examples): redesign usd-export-evaluation-mode as re-imported brass goblets
The still used to show two steel balls built from the live SUBSURF
modifier, which depicted the two qualities rather than the files. The
--output path now builds a turned goblet on an 8-sided lathe cage (SUBSURF
levels=0, render_levels=3) and exports it twice through the same
wm.usd_export call the check proves (TESSELLATE + VIEWPORT and TESSELLATE +
RENDER). It re-imports both USDA files with wm.usd_import and stages the
imported meshes on turned plinths. Both are flat-shaded with one brass
material, so geometry is the only difference. The placards read VIEWPORT /
RENDER plus the point count measured on each re-imported mesh, set in the
bundled DejaVu Sans Mono (Inter is a variable font whose overlapping
contours render with holes on 4.5). The render path also asserts that the
re-imported RENDER mesh is denser than the VIEWPORT one (exit 6). The
cube check is unchanged.
Evidence (live runs, local):
- E:\Blender-Developer-Tools\.scratch\blender-5.2.1-windows-x64\blender.exe
(Blender 5.2.1 LTS): check-only exit 0, base=8 usda_vp=26/24
usda_rd=98/96 usda_cage=8 scheme_cage=catmullClark.
--evaluation-mode VIEWPORT exits 4 ("RENDER TESSELLATE wrote 26 points /
24 faces"). --output: goblet usda points viewport=130 render=8450.
- E:\Blender-Developer-Tools\.scratch\blender-4.5.11-windows-x64\blender.exe
(Blender 4.5.11 LTS): check-only exit 0 with the same numbers; --output
renders the same still (130 / 8450).
- Framing: fill x=0.731 y=0.739; margins l=0.119 r=0.128 b=0.089 t=0.133.
- Contact sheet (docs/gallery/contact-sheets/usd-export-evaluation-mode-contact-sheet.webp):
candidate luma 0.253 / stage 0.233 / warmth +0.081 / sat 0.132, against
armature-bend 0.243/0.192/-0.144/0.237, damped-track-aim
0.237/0.218/+0.105/0.178, and bmesh-gear 0.236/0.177/+0.303/0.250.
Luma, stage and warmth are in range; saturation is the lowest, since the
subject is brass on grey stone, but the silhouettes read at thumbnail size.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Copy file name to clipboardExpand all lines: README.md
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<ahref="examples/usd-export-evaluation-mode/"><imgsrc="examples/usd-export-evaluation-mode/preview.webp"alt="USD export evaluation_mode: two steel SUBSURF cubes resting on a dark studio floor — left faceted viewport tessellation, right smoother render tessellation, warm wedge on the back wall" /></a>
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<ahref="examples/usd-export-evaluation-mode/"><imgsrc="examples/usd-export-evaluation-mode/preview.webp"alt="USD export evaluation_mode: two brass goblets on dark plinths, each re-imported from its own USDA file — left an eight-sided 130-point VIEWPORT export, right a smooth 8450-point RENDER export" /></a>
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"name": "usd-export-evaluation-mode",
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"dir": "examples/usd-export-evaluation-mode",
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"teaches": "The USD exporter evaluation_mode chooses viewport versus render modifier quality. TESSELLATE makes the split observable; BEST_MATCH writes the cage and the mode is silent.",
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"alt": "Two steel balls resting on the floor: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right.",
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"alt": "Two brass goblets on dark plinths, each re-imported from its own USDA export: an eight-sided 130-point goblet labelled VIEWPORT on the left and a smooth 8450-point goblet labelled RENDER on the right.",
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