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Comparison · Laser scanning and survey suites

Neurones 3D vs TopoDOT

Looking for a TopoDOT alternative? Neurones 3D is free, offline point cloud and Gaussian splatting software for Windows: the free viewer runs every process, from AI classification to dimensioned floor plans, and a one-time paid edition saves the results.

TopoDOT is point cloud extraction and modelling software from TopoDOT Solutions (formerly Certainty 3D) that runs inside Bentley MicroStation, aimed at road, rail, utility and structural deliverables in CAD.

By Dr. Florent Poux, maker of Neurones 3D · TopoDOT's facts from TopoDOT Solutions (formerly Certainty 3D)'s own documentation, checked

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The short answer

Choose Neurones 3D if you want a standalone Windows application, bought once, that classifies point clouds with trained models, builds terrain, contours and floor plans, detects change with M3C2 and writes DXF, without a CAD host or a yearly usage bill. Choose TopoDOT if your team produces road, rail and utility deliverables in MicroStation and needs its corridor extraction tools, organisation-wide licence and training programme, and can budget for the licence plus per-user-day maintenance.

At a glance

Neurones 3DTopoDOT
Runs onWindows 10 and 11 (64-bit)Desktop, inside Bentley MicroStation
Where it runsdesktopplugin
Licencefree viewer + one-time paid editionsone-time organisation licence plus annual maintenance billed per user-day
PriceFree viewer; paid editions bought once, no subscriptionEnterprise 300: $12,000 licence + $26.00 per user-day; Enterprise 500: $18,000 + $23.00; Enterprise 1000: $28,000 + $19.75 (as published) source
Free useThe free viewer opens, views and runs every process; writing results out needs a paid editionNo free tier or trial stated; demo on request. TopoShare Basic is included with every licence

Feature by feature

"Not stated" means we could not find it in TopoDOT Solutions (formerly Certainty 3D)'s documentation, not that it is missing. Each of TopoDOT's cells links to where we read it.

CapabilityNeurones 3DTopoDOT
Runs fully offlineYesNo account, no internet connection, no telemetryNot statedDesktop software inside MicroStation; annual maintenance is based on tracked user-days, and fully offline use is not stated
One-time licence availableYesBought once; no subscriptionPartlyThe licence level is a one-time company purchase, but annual maintenance is billed on tracked user-days source
Opens LAS/LAZ and E57YesLAS, LAZ, COPC, E57, PLY, PCD and more; a 127.8 M point E57 opens in about 22 sYesE57 read since version 6.0; tile export to DOT, LAS, LAZ and E57; LAS 1.4 export source
Scan registrationPartlyCloud-to-cloud alignment (ICP and graph matching, no initial placement needed), RMS shown with the inlier shareNot stated
AI point cloud classificationYesFour trained models ship in every build: indoor, aerial LiDAR, powerline, streetscape; a confidence per pointPartlyAI Ground Extraction and an AI ground classification tool (2023.2); machine-learning Automatic Asset ID; other classes by manual tools such as the Classification Brush source
SegmentationYesUnsupervised segmentation, primitive decomposition, components, roomsNot stated
Automatic floor plansYesAutomatic, dimensioned, with sections and elevationsNot stated
DXF / CAD drawingsYesDXF R2000, SVG and PDF; no DWGYesExtracts CAD linework and surface models directly in MicroStation source
DTM / DSMYesDTM, DSM, CHM, slope, aspect, hillshade on one gridPartlyExtracts break lines and elevation points; the DTM is built by the host CAD's DTM engine, which depends on the Bentley product used source
Contour linesYesContours that cannot crossNot stated
Change detectionYesM3C2 with a 95 % level of detection; cloud-to-cloud and cloud-to-BIM deviationPartlyWall Monitoring workflow reports wall movement; Deviation Overview; beam camber and sweep source
MeshingYesPoisson and clean meshing; the clean mesh is closed, not edge-manifoldYesStructural modelling turns dense point clouds into 3D meshes of bridges, pier caps and buildings source
Gaussian splatsYesOpens PLY and SPZ splats, converts them to points, meshes them; does not train splatsNot stated
ReportsYesSelf-contained HTML reports with provenanceYesWall monitoring reports, beam reporting, PCI pavement reports to ASTM 6433 source
Scripting / SDKYesEngine & SDK edition: Python package and headless command linePartlyBatch routines and MicroStation key-in and action strings; no SDK stated source

Where Neurones 3D is stronger

  • Neurones 3D runs on its own; TopoDOT requires a compatible Bentley MicroStation environment, bought separately.
  • Neurones 3D paid editions are bought once with no recurring charge; TopoDOT adds annual maintenance billed per user-day on top of a licence from $12,000.
  • The Neurones 3D free viewer opens, views and runs every process before any purchase.
  • DTM, DSM, CHM and contours that cannot cross are computed in Neurones 3D itself; TopoDOT hands extracted features to the host CAD’s DTM engine.

Where TopoDOT is stronger

  • Dedicated corridor extraction tools: road pavement, sidewalks, rails, overhead catenary, transmission towers and power lines, with template extraction and smart cells.
  • One organisation licence covers unlimited users and workstations, with training, TopoDOT University and TopoShare Basic included.
  • Deliverables are produced natively in MicroStation, with analysis tools for clearance, pavement distress (ASTM 6433) and floor flatness (ASTM E1155).

Who should choose which

Choose Neurones 3D to take a point cloud or a splat capture to a finished deliverable on your own machine: classified LAS, a dimensioned floor plan with sections and elevations in DXF, a DTM with contours, a change map or a report, without an account, an upload or a subscription. Every figure it publishes is measured; see the benchmarks.

Choose TopoDOT: Production teams already working in MicroStation who extract CAD linework, surfaces and assets from mobile and aerial LiDAR along road, rail and utility corridors.

Questions

Is TopoDOT free?

TopoDOT: Enterprise 300: $12,000 licence + $26.00 per user-day; Enterprise 500: $18,000 + $23.00; Enterprise 1000: $28,000 + $19.75 (as published). Free use: No free tier or trial stated; demo on request. TopoShare Basic is included with every licence. Neurones 3D’s free viewer opens, views and runs every process; writing results out needs a paid edition bought once.

Can TopoDOT classify point clouds with AI?

TopoDOT: partly. AI Ground Extraction and an AI ground classification tool (2023.2); machine-learning Automatic Asset ID; other classes by manual tools such as the Classification Brush. Neurones 3D: yes. Four trained models ship in every build: indoor, aerial LiDAR, powerline, streetscape; a confidence per point.

What is the best alternative to TopoDOT?

Choose Neurones 3D if you want a standalone Windows application, bought once, that classifies point clouds with trained models, builds terrain, contours and floor plans, detects change with M3C2 and writes DXF, without a CAD host or a yearly usage bill. Choose TopoDOT if your team produces road, rail and utility deliverables in MicroStation and needs its corridor extraction tools, organisation-wide licence and training programme, and can budget for the licence plus per-user-day maintenance.

How this comparison was made

Written by the maker of Neurones 3D, so read it as such. TopoDOT's column comes only from TopoDOT Solutions (formerly Certainty 3D)'s published documentation and listings, read on 2026-09-24; where we found nothing, the cell says "not stated". Neurones 3D's column comes from its own guides, which give the limits too. If something here is wrong or out of date, write to howto@learngeodata.eu and it will be corrected.

Sources:

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About

Why Neurones 3D exists.

Standing inside a 43.5 million point indoor laser scan rendered by Neurones 3D

I have spent years working with point clouds, and for most of them the software got in the way. I wanted one tool I would actually reach for every day: fast enough to enjoy, honest about what it does, and calm to use.

Neurones 3D started in Python, the way most of my research does. It worked, but it was heavy, and heavy tools quietly discourage you from opening them. So I rebuilt everything in Rust, from the file readers to the renderer, with one rule: stay frugal. A single small file, no cloud, no telemetry, billions of points on a laptop that is ten years old. In an age where every tool reaches for a data center, I wanted the opposite.

The goal is simple to say and hard to earn. One package that carries you from capture to understanding to deliverable, without exporting to five other programs along the way. Load a scan, a splat, a building, a phone video. See it, classify it, measure it, and send out something real. Together, in one place.

This is the tool I always wanted. I hope it becomes yours too.

Dr. Florent Poux 3D Geodata Academy

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