Brilliant Technology 3D | Leios 2
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Leios 2

Leios EGS BT

Leios is a fast, reliable and user-friendly solution for


  • elaboration of 3D scans,
  • editing of triangle meshes
  • reverse engineering.


The new version, Leios 2, is a turning point: new user interface and new workflow, performance boosts and new tools, granting users improved productivity and usability.

The new version, Leios 2, is a turning point: new user interface and new workflow, performance boosts and new tools, granting users improved productivity and usability.With Leios it’s possible to acquire datasets from any kind of 3D scanner, to easyly and quickly transform the point cloud into a NURBS mathematical model while having complete control of each step and analyzing the results with powerful inspection tools.

Leios features powerful elaboration and editing tools to make transformation of the original point clouds to manifold mesh easier and to fit the obtained meshes with CAD mathematical models.

Leios exports the datasets in many formats, both polygonal and CAD, suitable for several fields like:

  • industrial design,
  • engineering,
  • simulation,
  • archaeology,
  • medical and dental industry,
  • animation
  • and so on…

Since 1998 EGS has created software with a precise goal in mind: to provide customers an easy, user-friendly, but reliable and powerful solution for 3D scanning elaborations, reverse engineering, and 3D modeling.


Import / Export:

  • Point Clouds: asc, txt, dat, asd, cwk, vvd, opt, scs, xyz, v3d
  • CAD Data: iges, stp, sat, dxf
  • Meshes: stl, vrml, obj, ply, qmh…


  • Unlimited UNDO history
  • Transformation of point clouds, meshes and geometrical entities: move, rotate, scale, mirror, from WCS to WCS
  • Partial and full visibility selection tools: rectangle, circle, polygon, lasso
  • Mesh selection by face, curvature, crease angle.

Point Cloud Phase:

  • Registration, alignment and merging of point clouds and meshes with a single click
  • Noise: cleaning of noise and redundancy generated by the scanning
  • Filters: stochastic, density equalization, curvature based
  • Point cloud and selection smoothing, point cloud offset
  • Point cloud from surfaces

Mesh Phase:

The optimized point cloud is transformed in a triangulated mesh, the available tools can enhance the mesh quality.

  • 2D, standard 3D and high-noise datasets mesh triangulation
  • Import and healing of irregular STLs
  • Smoothing of the whole mesh or of a selection
  • Mesh healing: automatic single-click cleaning; highlighting and deletion of abnormal and irregular triangles, healing of non-manifold geometry
  • Inversion of normal direction, mesh decimation
  • Fitting of the selected region to plane, cylinder, sphere
  • Partial and complete hole filling and mesh bridging, flat or curvature-based
  • Defeature, fit mesh boundary to curve
  • Refining, remeshing, mesh sewing
  • Freeform mesh deformation
  • Mesh boundaries extension
  • Projection of curve on the mesh, mesh cutting by curve
  • Mesh booleans
  • Mesh can be exported in the standard formats for further applications



The mesh is dissected in several regions bounded by edges, each region can be fit to a NURBS surface. The mesh part recognized as an edge can be fit with loft and blend surfaces.

Edge recognition: automatic recognition of the model edges and fillet areas


  • Editing and elaboration of edges with automatic evaluation of the fillet area
  • Wireframe and dissection check



Several strategies can be used inside Leios to rebuild the CAD model starting from the scanned dataset, the user can choose the more useful strategy for his needs and his field of work, such as: designing, freeform models, cultural heritage, and so on… Strategies can be combined to achieve the desired result.

Curves, Surfaces, Solids, Reference Geometry:

Creation, extraction and fitting of primitives.


  • Points, lines, circles, arcs, planes, cylinders, cones, spheres, blocks
  • Single-click plane fitting
  • Curve extraction from edges (character curves)
  • Sections (linear, radial, along a curve)


  • Fitting of a curve from the point cloud, surface-surface intersections, mesh-surface intersections
  • Editing, dividing, joining, extending, matching, projecting and offsetting splines

NURBS surfaces:

  • Surface fitting to mesh region;
  • By points, between four curves, by sections, swept, revolved, covered, blended, by surfaces join;
  • Division, cutting, original surface, gap correction, matching win G1 continuity, smoothing, refinining;


  • Extrusions from curves and sketches
  • Cylinder, sphere, revolve, drive, by sections, edge blending, thickness
  • Booleans: union, subtraction, intersection

Reference Geometry:

  • Axis, planes, WCS
  • Automatic extraction of main planes of a model
  • Automatic extraction of the symmetry plane

Automatic and semi-automatic reconstruction of patches:

  • Completely automatic reconstruction (autosurf)
  • Manual or semi-automatic creation of the grid network
  • Construction of patches with G0, G1, G2 continuity constraints
  • Gap correction, match with G1, G2 continuity

Automatic or manual reconstruction of the NURBS model with trimmed and analytic surfaces:

  • It’s possible to rebuild both free-form and prismatic models with the available tools
  • Model dissection in separate regions
  • Reconstruction of the wireframe structure and of the surfaces fit on the regions
  • Fitting of analytic surfaces (planes, cylinders, spheres)
  • Constraints between analytic surfaces or reference geometry (distance, angle, perpendicularity, parallelism)
  • Blends based on the fillet area radius extracted in the edge phase


  • Distance measurement, angles, lengths, areas, volumes
  • Point cloud – NURBS surfaces deviation analysis
  • Reports
  • Mesh – Mesh deviation
  • Curvature plot
  • Point cloud – CAD Model best fit
  • Intersecting angle between axes or planes


  • Import or acquire point clouds from several supported scanners;
  • Point cloud enhancing and optimization;
  • Scans alignment and merging.


  • Mesh cleaning, smoothing, enhancing;
  • Hole filling and mesh repair tools;
  • Optimization for surfacing, milling and further processing.


  • Mesh sculpting and free deformation;
  • Offsetting/Shelling;
  • Boolean operations, separation by clusters.


  • Character lines identification;
  • Region dissection and curvature identification;
  • Precise and fast analytic surfaces fitting.
  • 2D sketch fit of cross-sections for rapid development.


  • Automatic and semi-automatic reconstruction by NURBS patches;
  • Accurate continuity analysis on surfaces and curves;
  • Compare NURBS and fitted surfaces against the mesh.


  • Save for archiving, printing, rendering and analysis in the most common formats (STL, OBJ, PLY); Export to your CAD of choice in STEP, IGES, DXF format.


– Leios imports ordered and non-ordered point clouds

– Point clouds in standard ASCII: asc, txt, dat, asd

– Closed formats: cwk, wd, opt, v3d, xyz


stl, vrml, obj, ply


iges, stp, sat, dxf


Windows 32bit

Leios can load and import about 70mln points with a 32bit Microsoft OSes and 2gb of RAM, more can be loaded with 32bit Microsoft OSes and 3,25gb of RAM (maximum addressable stack in 32bit Microsoft OSes).

  Windows 64bit

With 64bit Microsoft OSes the point cloud size limit is bound to the RAM quantity available in the system (see SPECIFICATIONS)


Processor: Intel Core Duo T2300 or better, AMD Athlon XP X2 3800+ or better

Memory: 2GB in a 32bit SO. 4GB Recommended

Grapgic Card: NVidia Quadro / 6x or better, ATI/AMD FireGL/”X” or better

OS: Windows XP Professional SP2 or better, Windows Vista, Windows 7 (with more than 3GB RAM, a 64bit system is recommended)

To handle great amount of data, a Quad Core system with 8 GB RAM and Windows Vista / Windows 7 Professional / Windows 7 Ultimate is recommended.