Patched Surfaces Must Meet and Flow Correctly

I have now taken the retractable knife model a stage further and built the surfaces, as you can see I have turned on the edge locators to see if I have Position, Tangecy and Curvature Continuity where it is required.(I have Locator Persistence turned on, on the >Evaluate>Surface Continuity tool.)At this stage of the build, if there is a failure at one or more of the surface boundaries to get “P”, “T” of “C” the adjacent surfaces must be tweaked until the problem is put right. If the problem is beyond tweaking, then I have to delete the offending surfs. and re-construct them taking care that adjacent boundaries have matching degree levels (A degree three surf. boundary adjoins another of the same deg. 3 construction) and ensuring that surfaces have the same number of spans and consequently, surface isoparms. Usually I go back and re-check that curves meet with G0 or G2 etc as required.I find that only by taking great care to match the characteristics of adjoining surfs. can I move towards having a good model , which does not end up in the recycle bin.This model has a number of surface continuity problems and when I have finished the model  I will build another, learning from my mistakes.[slickr-flickr tag=”craft knife 3″]________________________________________________________________
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