Comments (1)
Testing with this script in https://gltf.report ...
import { MeshoptSimplifier } from 'meshoptimizer';
import { weld, simplify } from '@gltf-transform/functions';
await document.transform(
weld({tolerance: 0.0001}),
simplify({simplifier: MeshoptSimplifier, ratio: 0.0, error: 0.45, lockBorder: true})
);
... I get pretty much the same result. Note that MeshoptSimplifier does not see all of a mesh's attributes, just the vertex positions and their connectivity (via indices). In general, and particularly with lockBorder
, it's going to try to preserve topology, so I think collapsing a 3D shape to a single triangle is probably something the algorithm explicitly avoids.
What we can do to give Meshopt the best possible chance of success, would be to minimize seams and maximize connectivity. Welding tries to do that, but extra vertex attributes make it hard. I'm not sure which attributes you need at higher LODs, but removing everything but POSITION resolves the issues you're seeing...
import { MeshoptSimplifier } from 'meshoptimizer';
import { weld, simplify, prune } from '@gltf-transform/functions';
for (const mesh of document.getRoot().listMeshes()) {
for (const prim of mesh.listPrimitives()) {
for (const semantic of prim.listSemantics()) {
if (semantic !== 'POSITION') {
prim.setAttribute(semantic, null);
}
}
}
}
await document.transform(
prune(),
weld({tolerance: 0.0001}),
simplify({simplifier: MeshoptSimplifier, ratio: 0.0, error: 0.45, lockBorder: true})
);
... with that simplification gets the result you're probably expecting:
- error = 0.45 -> tetrahedron
- error = .50 -> pair of back-to-back triangles
- error = .55 -> empty primitive
Possibly a weld mode that explicitly ignores vertex attributes other than position would help here (but doesn't exist in glTF Transform now) if you don't want to delete these attributes. There's also an experimental meshopt simplification function that includes vertex attributes — with custom weights — but that isn't integrated into glTF Transform yet, see #1153.
from gltf-transform.
Related Issues (20)
- An option to keep separate buffer views when doing `meshopt` HOT 7
- Unexpected handling of `generator` during `merge` HOT 3
- Race condition in toKtx.ts HOT 3
- Merging documents with extensions HOT 7
- Cache cleanup HOT 2
- Draco compression may produce an UNSIGNED_SHORT index buffer with vertex count > 65535 HOT 3
- Change default compression with 'optimize' CLI to Meshopt
- `partition` command is slow for large models HOT 6
- Simplify Draco and Meshopt compression implementations
- Prune fails to clean up accessors referenced by non-root properties HOT 2
- VRM gets treated as glTF instead of GLB HOT 11
- Serialization format for transforms HOT 2
- Roadmap for '@gltf-transform/view' package
- Quantization creates invalid skinning weights for CesiumMan.glb
- Support transforms reporting a 'skip' result
- Minor glitch in documentation typings HOT 1
- implements meshoptimizer -sv HOT 1
- sharp error HOT 2
- Improving website credits
- CLI 'validate' command should use exit codes and stderr properly
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