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Research Status on Multi-Resolution Modeling System

Research Status on Multi-Resolution Modeling System. Youngjae Song CAD Lab,. Seoul National Univ. Contents. Previous Work Simplification of B-rep based CAD Model Simplification of Feature based CAD Model Proposed System Architecture for Multi-resolution model. Current Status

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Research Status on Multi-Resolution Modeling System

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  1. Research Status on Multi-Resolution Modeling System Youngjae Song CAD Lab,. Seoul National Univ.

  2. Contents • Previous Work • Simplification of B-rep based CAD Model • Simplification of Feature based CAD Model • Proposed System Architecture for Multi-resolution model. • Current Status • Streaming B-rep Model using Wrap-around operation • Feature based Modeling syst. supporting multi-resolution • Examples • Discussion

  3. Simplification of B-rep Model • Wrap-around • Remove the small local features from the model. • 1. Removal of the concave regions. • 2. Removal of the holes. (convex inner loops in the faces) • 3. Removal of fillet/round, and chamfer.

  4. Simplification of Feature Model • Feature re-ordering scheme • Sort the feature list in the order of decreasing contribution volume to the entire model. • Developing the our own Feature-based Modeler.; limitations of the SolidWorks APIs • ID system for the consistent entity naming.; face, edge, vertex…

  5. Solidworks Feature Information MRModeler Feature Regeneration(Define LOD level) Feature Reordering(delta volume, small volume feature removal, sketch simplification) Constraint Simplification Feature suppression LOD tree & Display Proposed System Architecture • General Procedure

  6. Streaming B-rep Model (1) • Application of the Wrap-around operator to the network transmission of B-rep model. • Model Server; • Sequentially apply the WA operation to original model. • Generate the list of face groups sorted in the order of decreasing contribution to the original. • Model Client; • Sequentially apply the Reverse WA operation to first-sent solid model. • Reconstruct the original shape with the received faces.

  7. Streaming B-rep Model (2) • Examples Client Program Server Program

  8. Streaming B-rep Model (3) • More Complex Examples • Including the newly added Wrap-around function.Ex) Fillet/Round, Chamfer… • Developing the efficient algorithm for the assembly-level Wrap-around operation. • Finding the outer-most faces.

  9. Feature-based Modeling system • Interface to SolidWorks. • Extract all the possible feature information from SolidWorks. • Reconstruct the feature model in our one system. • Own ID system. • Some modeling functions to add the loss feature information. • Available feature set consistent with SolidWorks. • Extrude-Boss, Extrude-Cut, Sweep, Fillet, Chamfer, Patten, etc.

  10. Feature-based Modeling system • Examples

  11. Schedule • Overall Schedule

  12. Discussion • Some Other Issues • Integration of Wrap-around operation into Feature-based modeling system. • Assign the access level to each LOD of models. • Introducing the skeleton model to the solid model. • Integration of Human model and solid model. • Integration of modeling system and simulation system. • Performance of Feature Reordering System. • Real-Time generation of the selected LOD models. • Enhancements for very large assembly model.

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