jldaureil Posted October 1, 2018 Share Posted October 1, 2018 I derive 3 versions faceted (3 resolutions) from a complex smooth object (initial modeling in solidworks)(Import in formz gives solid smooth)The main object is a circular dome.I wanted to do that in Z8 to get a mesh without a triangle.But I do not understand exactly how the mesh algorithm worksHere is a synoptic of the parameters usedZ6.7.3 = Max Normal deviation (point density and facets) When I open the file in Z8The software creates as many faceting schemes as I have variantsperfect !It converts the parameter Max Normal deviation to normal angle toleranceZ6.7.3 = Max Normal deviation (point density and facets)Z8 = Normal angle tolerance (Surface tolerance and Edge tolerance)Under Z6 Max Normal deviation is perfectly predictablefor example 15 ° exactly produces a circle of 24 faces (logic 360/15 = 24)By cons Z8 for Normal angle tolerance at 15 ° I get 36 segmentsFor 10 ° I have 54 segment instead of 36 under Z6Do you know why ? Thanks JL File Lien du téléchargement https://we.tl/t-uEtul5a4bi Link to comment Share on other sites More sharing options...
vva Posted October 1, 2018 Share Posted October 1, 2018 hi JL, there are 3 small holes in your hood (for the cables), they make the faceting a bit complex. work around : derive the contour and rotate it. so you have best control over the faceting. vva Link to comment Share on other sites More sharing options...
jldaureil Posted October 1, 2018 Author Share Posted October 1, 2018 goodThis is the way I followed ..I derived all the faces and then I started to rebuild progressively by rotating the "non-aligned" facesBUTfor a reason that I do not understand happened to the face on the following image, firstly the derivative face do not produce facets (with 22.5° angle for max normal angle I get 48 segments than 24) like the others and secondly when I want to rebuild it (nurbz degree 1 in V) facets ares in slight rotation.If I want to be clearer:I use two sources that are perfectly aligned (circles 24 segments at 22.5° for Max Normal Angle)When I perform the tight loft the facets are lightly turned on the resulting nurbzI still have 24 segments (the first segment perfectly at 90 °on the word grid) but each angle that I can verify by converting the object varies slightly (around 15 °but not exactly 15°) (always with 22.5° for Max normal angle in my exemple)This curious phenomenon explains why while these geometries are very regular one obtains faces not aligned in direction V (longitude) and thus these series of triangles between the stitched surfaces ... it's recurrent with parametric geometry in FZ but that's also why converted faceted objects are never as clean as if they were built directly faceted.Finally, in Z8 if we convert without triangle on fringe scheme, we obtain shifted grids (which will probably have to be triangulated)I have the impression that I am confronted here with a fundamental limit of the facet creation algorithm.(Which explains why the scheme with triangle one fringe is selected by default) Link to comment Share on other sites More sharing options...
jldaureil Posted October 2, 2018 Author Share Posted October 2, 2018 Hi I've created a simple file to isolate that question as you can see faceted objects converted from the smooth nubz loft presents irregularities (pink circles) (to be compared to the clean faceted version constructed with c-mesh (under Z673)) I do not understand exactly why this occurs... Ztech, can we have an technical explanation ? TEST smooth.fmz Link to comment Share on other sites More sharing options...
Rudy Daverveld Posted November 20, 2018 Share Posted November 20, 2018 still waiting.... and still curious! Link to comment Share on other sites More sharing options...
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