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Solid-Modelling-Internals

Solid-Modelling-Internals. The modeller. GUI. .stl. The Husk. .sldprt. Geometry Kernel. .sat. Basic Components. GUI -provides a rendering/viewing facilities. Provides modelling ease Husk -Implements operations, controls and manages the parametrization and the solid

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Solid-Modelling-Internals

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  1. Solid-Modelling-Internals

  2. The modeller GUI .stl The Husk .sldprt Geometry Kernel .sat

  3. Basic Components • GUI-provides a rendering/viewing facilities. Provides modelling ease • Husk-Implements operations, controls and manages the parametrization and the solid • Kernel-maintains the basic geometry. Answers geometric queries posed by the husk.

  4. Post-Modeller Analysis Husks In this case: Curvature Analysis

  5. GSSL Husks • AFR/FeatureWorks • CFL/Blend Recognition and Suppression • CollabView • CAMWorks The Husk-Kernel Interface is very important

  6. The GUI • Present a Co-ordinate system • Make selection and design of entities easy • Provide interfaces to down-stream analysis and recently • Provide for collaborative design! GUI can make-or-break

  7. The HuskFront Office • Implements Operations (gets it done from the kernel). -extrudes/revolves/sweeps -extract parameters and use kernel operations • Maintains design tree and modifications and alerts user! -maintains the sequence and dependence of the operations -maintains parameter consistency

  8. The HuskBackOffice • Maintains relationships between geometric entities -such as between counter-bores/assemblies -across features • Re-sequences operations -roll-back and re-do -record such inter-dependency

  9. Implements operations…. • Takes the scribe and prepares the Cylinder. • Subtracts the cylinder

  10. Maintains and updates design tree….. Deepen the hole Alert The User!!

  11. Relationships between geometric quantities…. Counter-Bore Holes Maintain co-axiality of the two cylinder axes

  12. Re-sequences operations Desired Husk Operation. • Kernel Operation • Blend the edge first. • Thendo the boss

  13. Kernel • Maintains the solid as faces/edges/vertices • Implements operations such as booleans, offsets, and even blends • Supplies answers to geometric queries

  14. RoutineOperations • Booleans • blends

  15. A typical Query… Does the curve C2 on face F intersect the curve C1?

  16. Another query from a CAM husk • What is the distance between faces S and S’? S CAM picture Can the ball cutter go in? S’

  17. Kernel Operations Kernel typical APIs: • Is this point on this face? • Find the closest point to p on surface S • Intersect solids B1 and B2 • Compute tangents

  18. The B-Rep of a solid • Boundary of a solid as a closed surface. • Inside/Outside and a outward normal • Surface composed as a collection of faces/edges/vertices Face Edge vertex

  19. Face-the 2d-fragment of a surface. Edge-the 1d fragment of a curve Co-edge-edge as an element of a face Vertex-0d element of design space. All quantities in design space Two-tier representation - combinatorial or topological - parametric or geometric Basic Entities

  20. Topology • Adjacency relationships between face/edge/vertices • Orientation All objects here have the same topology.

  21. Topology cont. • Face-a collection of loops • Loops-sequence of signed edges • Edge-ordered pair of vertices • Vertices-just a Set

  22. Applications of Topology Husk: check topology! And alert user.

  23. Applications of Topology-II Kernel:Helps in sequencing intersections. If F intersects F2 boundary along e1, then F1 is next.

  24. Wrap-Up • The GUI-Husk-Kernel trichotomy • Husk-as the legislative body of operations • Kernel-as the executive body Kernel Representation: Geometry/Topology Topology Details

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