Hypothesis · 01
H01 · uniform collapse
Uniform quadric collapse
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989088
Completed from the original full-poly pedal.
Readout
Measured by Blender re-import, remote checksum verification, and SSIM/PSNR render comparison against the original pedal render.
WinnerBest direct reducer: gltfpack hit 6,453 triangles with SSIM 0.998823 and only 158.8 KB GLB.
Runner-upBest custom/open-source reducer: CGAL hit 6,450 triangles with SSIM 0.991535 after exact-position welding.
Best hypothesisBest Blender hypothesis: H06 planar 8° + collapse kept the 6,453-triangle target and scored SSIM 0.989422.
AvoidAvoid for this pedal: voxel remesh, AutoRemesher, and Instant Meshes visibly damaged or overshot the mechanical tread/silhouette.
Hypothesis experiments
Ten controlled Blender hypotheses from the linked hypothesis page, all starting from the original full-poly FBX and targeting the prior 80% reduction sweet spot.
Hypothesis · 02
H02 · material guard
Material-boundary guard
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989088
Source has 1 material slot and no active inter-material edge boundary; guard is a measured no-op before collapse.
Hypothesis · 03
H03 · uv guard
UV-seam guard
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989088
UV seams preserved before collapse.
Hypothesis · 04
H04 · normal guard
Sharp-normal guard
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989088
Source has 0 explicitly sharp edges; sharp-normal guard is a measured no-op before collapse.
Hypothesis · 05
H05 · planar 2deg
Planar dissolve at 2 degrees, then collapse
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989126
Planar prepass changed triangles from 32269 to 32142.
Hypothesis · 06
H06 · planar 8deg
Planar dissolve at 8 degrees, then collapse
6,453 tris
62,653 verts
80.00% reduced
SSIM 0.989422
Planar prepass changed triangles from 32269 to 31747.
Hypothesis · 07
H07 · micro weld
Micro-weld exact duplicates, then collapse
6,453 tris
3,225 verts
80.00% reduced
SSIM 0.978297
Welded 72332 exact duplicate vertices at 1e-7 m before collapse without changing source triangle count.
Hypothesis · 08
H08 · voxel remesh
Voxel topology reset
6,432 tris
3,204 verts
80.07% reduced
SSIM 0.942164
Selected voxel size 0.004666748 m by 12-step search for closest result to 6453 triangles.
Hypothesis · 09
H09 · unsubdivide
Unsubdivide, then collapse
6,453 tris
62,652 verts
80.00% reduced
SSIM 0.986535
Unsubdivide prepass changed triangles from 32269 to 31691.
Hypothesis · 10
H10 · symmetry x
X-symmetry-aware collapse
6,453 tris
62,655 verts
80.00% reduced
SSIM 0.989088
Completed from the original full-poly pedal.
Tool trials
Every practical tool from the research list was either run or recorded as a blocked/failure result. Conversion-only tools are included because they are useful in a CAD-to-VR pipeline but did not reduce polygons.
Tool trial · 01
gltfpack
meshoptimizer / gltfpack 1.2
6,453 tris
4,132 verts
80.00% reduced
SSIM 0.998823
Hit the 6,453-triangle target exactly with permissive simplification and locked borders.
Tool trial · 02
gltf transform direct
glTF Transform 4.4.2 — direct
32,255 tris
92,856 verts
0.04% reduced
SSIM 0.999790
Topology-limited direct simplification; triangle count barely changed.
Tool trial · 03
gltf transform welded
glTF Transform 4.4.2 — weld + simplify
32,249 tris
90,470 verts
0.06% reduced
SSIM 0.999790
The built-in weld removed some duplicate attributes but simplification remained topology-limited.
Tool trial · 04
meshlib
MeshLib WASM 3.1.3-429
6,453 tris
17,024 verts
80.00% reduced
SSIM 0.987657
Hit 6,453 faces after allowing boundary-vertex movement; a boundary-locked first attempt removed nothing. Evaluation license only.
Tool trial · 05
instant meshes
Instant Meshes
43,730 tris
28,906 verts
-35.52% reduced
SSIM 0.961163
Completed an all-quad field-aligned remesh, but logged many unfilled high-degree holes on the triangle-soup source.
GLB reimport changed topology: 42,673 vs 43,730 triangles.
Tool trial · 06
autoremesher
AutoRemesher 1.0.0
11,700 tris
8,351 verts
63.74% reduced
SSIM 0.921465
Completed from the original OBJ but overshot the 3,200-quad request: 5,397 quads plus 1,720 non-quads.
Tool trial · 07
cgal
CGAL 6.x Surface Mesh Simplification
6,450 tris
3,223 verts
80.01% reduced
SSIM 0.991535
Custom edge-collapse runner reached 6,450 triangles after exact-position source welding.
Tool trial · 08
assimp
Assimp 6.0
32,269 tris
94,376 verts
0.00% reduced
SSIM 0.997175
Reliable FBX-to-GLB plumbing, but it preserved all 32,269 triangles and is not a reducer.
Tool trial · 09
mayo
Mayo 0.10.0 + OpenCascade
32,269 tris
94,376 verts
0.00% reduced
SSIM 0.997174
Built from source on macOS and converted FBX to GLB, but the tessellated FBX offered no BREP retessellation or polygon reduction.
Blocked or report-only tools
Good or bad means all outcomes are posted. These tools could not produce a repeatable local model result without credentials, SDK access, or a missing batch runner.
Blocked result
MeshLab 2025.07
GUI opened the model, but the current macOS package ships no meshlabserver or repeatable unattended filter runner.
Blocked result
Simplygon 10.x
No runnable macOS SDK/CLI or evaluation license was available.
Blocked result
InstaLOD 2026
macOS is supported, but the SDK/CLI and machine authorization were absent.
Results table
FBX links below are direct ForgeMedia asset URLs; record links open the ForgeMedia model viewer page.
| Result | Status | Triangles | Reduction | SSIM | GLB check | Downloads |
|---|---|---|---|---|---|---|
| H01 · uniform collapse Uniform quadric collapse | executed | 6,453 | 80.00% | 0.989088 | match | FBX · GLB · FBX record |
| H02 · material guard Material-boundary guard | executed | 6,453 | 80.00% | 0.989088 | match | FBX · GLB · FBX record |
| H03 · uv guard UV-seam guard | executed | 6,453 | 80.00% | 0.989088 | match | FBX · GLB · FBX record |
| H04 · normal guard Sharp-normal guard | executed | 6,453 | 80.00% | 0.989088 | match | FBX · GLB · FBX record |
| H05 · planar 2deg Planar dissolve at 2 degrees, then collapse | executed | 6,453 | 80.00% | 0.989126 | match | FBX · GLB · FBX record |
| H06 · planar 8deg Planar dissolve at 8 degrees, then collapse | executed | 6,453 | 80.00% | 0.989422 | match | FBX · GLB · FBX record |
| H07 · micro weld Micro-weld exact duplicates, then collapse | executed | 6,453 | 80.00% | 0.978297 | match | FBX · GLB · FBX record |
| H08 · voxel remesh Voxel topology reset | executed | 6,432 | 80.07% | 0.942164 | match | FBX · GLB · FBX record |
| H09 · unsubdivide Unsubdivide, then collapse | executed | 6,453 | 80.00% | 0.986535 | match | FBX · GLB · FBX record |
| H10 · symmetry x X-symmetry-aware collapse | executed | 6,453 | 80.00% | 0.989088 | match | FBX · GLB · FBX record |
| gltfpack meshoptimizer / gltfpack 1.2 | succeeded | 6,453 | 80.00% | 0.998823 | match | FBX · GLB · FBX record |
| gltf transform direct glTF Transform 4.4.2 — direct | failed_target | 32,255 | 0.04% | 0.999790 | match | FBX · GLB · FBX record |
| gltf transform welded glTF Transform 4.4.2 — weld + simplify | failed_target | 32,249 | 0.06% | 0.999790 | match | FBX · GLB · FBX record |
| meshlib MeshLib WASM 3.1.3-429 | succeeded | 6,453 | 80.00% | 0.987657 | match | FBX · GLB · FBX record |
| instant meshes Instant Meshes | succeeded_with_damage_risk | 43,730 | -35.52% | 0.961163 | exporter_changed_topology | FBX · GLB · FBX record |
| autoremesher AutoRemesher 1.0.0 | missed_target | 11,700 | 63.74% | 0.921465 | match | FBX · GLB · FBX record |
| cgal CGAL 6.x Surface Mesh Simplification | succeeded | 6,450 | 80.01% | 0.991535 | match | FBX · GLB · FBX record |
| assimp Assimp 6.0 | conversion_only | 32,269 | 0.00% | 0.997175 | match | FBX · GLB · FBX record |
| mayo Mayo 0.10.0 + OpenCascade | conversion_only | 32,269 | 0.00% | 0.997174 | match | FBX · GLB · FBX record |
Evidence files
Machine-readable manifests, visual metrics, re-import checks, and the remote checksum proof are posted to ForgeMedia or retained in this preview.
Remote verification: 46 ForgeMedia downloads matched local byte counts and SHA-256 hashes. Model pages returned HTTP 200 where applicable.