105 - Synchronizing History

Transcription

1 4 th Generation VLC courtesy of Edison Synchronizing History Matt Lombard, Solid Edge Employee #SEU13

2 Agenda: Synchronizing History Who is Matt Lombard? Why you should mix methods (Synchronous and History) CAD Geek Crash Course Why SE s mix is best To learn more, experiment! 4 th Generation VLC courtesy of Edison2 Page 2

3 Who is Matt Lombard Newest Solid Edge Employee Work for Dan Staples Responsible for community communication Former Independent Design Contractor (CAD User) CAD Jedi, but Solid Edge Paduan Author of several CAD books, including: General reference Surfacing Administration CAD blogger: Page 3

4 How Can Expertise with Another Tool Help Me? All CAD software is built on the same basic rules If you understand those rules, a world of new possibilities opens up At the very least, you will understand why some things don t work You should also be able to predict things that will work that you might not have thought of before Page 4

5 History Has its Benefits For existing users, History is familiar The trick of reordering features can have some nice effects with things like shells and fillets You can create and edit anything in Historybased modeling, including non-analytical shapes Driving faces with sketches makes sense to most people Page 5

6 History Doesn t Make as Much Sense as You Think Changing design intent the way the model reacts to changes can mean rebuilding multiple features or sketches There is no real process to compare history-based modeling to Some features coming before others makes no sense in the context of a part within an assembly Lost references after changes higher in the tree Inconsistencies: sketches and assemblies are not history-based, yet part features are Page 6

7 Direct Edit is Cool Direct edit is an easier concept than historybased It works best on prismatic geometry analytical shapes You just edit the geometry directly by moving it or changing dimensions Synchronous Technology extends the functionality of direct edit Page 7

8 The Synchronous Vision Synchronous Technology augments direct edit with: PMI dimensions to drive the model directly Persistent relations between model faces Live Rules that recognize design intent on the fly Procedural features have parameters, but no sketches or history Synchronous Features do not have any order, but remember which faces they affect Can be selected Edited Deleted Sorted by name or type Page 8

9 Direct Edit Also has Drawbacks Direct Edit seems easy, but it requires a functional knowledge of CAD Geek stuff for best results (I ll go through some of this later) Any change that increases the number or type of faces may not work (topology) Changes to non-analytical geometry may be limited or impossible Changes that involve rounds can be very troublesome Page 9

10 Have you ever Wondered? Have you ever wondered how to predict when a direct edit will fail? If you could understand why this happens and how to fix it, would you use Synchronous Technology more? Page 10

11 Crash Course in CAD Geek Terminology All model faces want to be 4 sided as a consequence of NURBS technology V U-V curves form a mesh Any face that has less than 4 sides is either a trimmed 4 sided face or degenerate U Degenerate means it has one or more zero length sides Blue: Untrimmed 4 Sided Face Green: Trimmed Face Degenerate Point U V Page 11

12 Crash Course in CAD Geek Terminology Topology Types: Planar Cylindrical Conical Spherical Toroidal Ruled Page 12 Revolved Complex

13 Crash Course in CAD Geek Terminology BREP is the boundary representation of all of the faces around a solid part Extends infinitely Topology refers to the number and type of all model faces In this case 6 planar faces Only extends until it intersects itself Best case is when all faces can be extended Planar faces extend best Cylindrical can intersect itself in one direction Extends infinitely So a box like this gives ultimate editability using direct edit methods The more you deviate from this sort of shape, the less editable the shape becomes Page 13

14 Best Answer: Combine and Conquer History and Direct methods have different weaknesses, and different strengths In Synchronous, the model drives design intent In History, sketches and features drive design intent Why not use each for its strengths? This avoids the weaknesses of each Page 14

15 How Would That Work? Build and edit prismatic features in Synchronous Add rounds, chamfers, draft, and cosmetic features as Ordered Spline-based geometry should be Ordered Page 15

16 Example Imported part with rounds already on it. Remove Rounds Page 16

17 The Difference Between Getting it Done and Not With rounds, you can t move the boss. Without rounds, it works with ease. Frustrating. Page 17

18 BREP Has Limitations On this feature, the BREP cannot remember the flat faces that existed before the rounds covered them over. Original Imported Part with Rounds Torus Plane Cylinder Removing the fillets doesn t add the faces back. This is one major advantage of History modeling it always remembers consumed faces. Page 18

19 Summary Solid Edge has two fantastic sources of power: Use them both Understand the basic rules of all CAD to master frustration and failure Even with imported geometry, you can edit as native Page 19

20 Thank You! Matt Lombard Page 20