Which editing package handles converted scans best?

MeshLab for the measurement-driven passes and Blender for everything artistic — retopo, sculpting, UVs. Both import OBJ without ceremony, which is why this conversion precedes nearly every scan-editing workflow.

Will the OBJ remember the scan's colors once I start editing?

In tools that display OBJ vertex colors, yes — painting and sculpting can proceed with the scan's color reference visible. The moment the workflow moves to image textures, vertex colors become an underpainting rather than the finish.

Will my scan's vertex colors show up in Blender after OBJ conversion?

Only as an MTL approximation: PLY's COLOR_0 tints map to a diffuse color average, losing per-vertex variation. For true vertex colors in Blender, import the PLY directly (it has a native reader) — OBJ route is for tools that don't.

Why send a scan to OBJ at all?

The DCC edit pass: cleanup, decimation, boolean repairs in ZBrush/Blender/MeshLab-wannabes that prefer OBJ. Scans rarely survive to production unedited — OBJ is the bridge into that toolchain, with UV-free geometry as the (preserved) starting point.

How much bigger is the OBJ than my binary PLY?

Expect 3-5×: decimal-text vertices versus binary floats. Dense scans (millions of points) produce genuinely large OBJs — fine for local DCC work, painful for transfer. Binary PLY stays the archival copy.

Do the explicit per-vertex normals help the OBJ import?

Yes — the converter writes vn lines from PLY's normals, so shading is consistent immediately. Without them, tools recompute from winding and scanned meshes (with their messy winding) can shade patchily until normals are recalculated.

PLY → OBJ PLY to OBJ Converter — Online & Free

Change a PLY model into OBJ in one pass, then see exactly what the new file keeps, flattens or drops before you download it.

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Reads GLB, GLTF, OBJ, STL, FBX, PLY

GLBGLTFOBJSTLFBXPLY

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Kept

The complete mesh, per-vertex colors (as supported by OBJ tooling), and sane scaling

Lost

PLY's extended attributes beyond what OBJ records; texture images were never part of a PLY

Use for

Preparing scans for retopology, repair and sculpting in mainstream DCC tools

Using the OBJ file afterwards

Import to Blender/Maya/ZBrush for decimation and cleanup; keep .obj+.mtl together if materials were assigned

PLY to OBJ hands captured geometry to the editing world: the scan arrives in the format every modeling package opens, with UVs and material slots ready for the cleanup passes ahead. Vertex colors ride along where the OBJ pipeline supports them; image-quality texturing remains a job for the DCC, after the geometry work is done.

What changes in the file

1
Vertex colors may not display in every OBJ importer — Blender and MeshLab honor them; some tools ignore the data silently
2
Scans import as one dense mesh; expect to decimate or split shells before serious editing
3
No UVs exist yet — unwrap after cleanup if the plan is image texturing

PLY → OBJ: format spec comparison

Hard facts side by side — what each format is, where it comes from and what it can hold.

Spec	PLYSource format	OBJTarget format
Developer	Stanford University (Stanford PLY)	Wavefront Technologies
First released	1994 (Stanford scan project)	1980s (Princeton Univ. lineage)
Data model	Element lists (vertex/face), ASCII or binary	Plain-text vertex/face lists + MTL sidecar
Textures	Per-vertex colors only (no UV maps)	UV coords only; MTL references image files
Animation	None	None
Typical size	Compact binary; dense scans grow fast	Large (ASCII vertices), shrinks with -binary variants
Openness	Open, documented	Open, informal spec
Primary use	3D scanning, photogrammetry, scientific meshes	DCC interchange, sculpting, 3D printing prep

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More ways out of PLY

PLY → GLB PLY → GLTF PLY → STL

Other routes into OBJ

GLB → OBJ GLTF → OBJ STL → OBJ FBX → OBJ

Every conversion route

Per-format pages and all 25 format-to-format paths — each one pre-configures the converter for that exact job.

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