magneto Posted November 15, 2011 Share Posted November 15, 2011 (edited) Do I have to use the Circle SOP? That's what I did and it works when the divisions are set to 4, but when I switch it to 4, it makes the shape round/circular. I want to have something like this (CV Curve from Max): They yellow points are control vertices (CVs), so it actually has 4 points. Edited November 15, 2011 by magneto Quote Link to comment Share on other sites More sharing options...
Marc Posted November 15, 2011 Share Posted November 15, 2011 Other than manually snapping 4 points to each corner I don't think there's a way. Unless some newfangled functionality has been added since the last time I used NURBS . M Quote Link to comment Share on other sites More sharing options...
magneto Posted November 15, 2011 Author Share Posted November 15, 2011 Thanks Marc, and here I was trying to get myself into pure procedural thinking. If we disregard NURBS, is there a way to create a rectangle shape procedurally? Quote Link to comment Share on other sites More sharing options...
zarti Posted November 16, 2011 Share Posted November 16, 2011 How to create a NURBS rectangle in Houdini? > make a rectangular polygon > append a convertSOP node ....set its 'convert to' = nurbs curve ....set its 'u order' = 2 i use this method often when nurbs tools are appropriate for certain operations then convert them back to poly-state . .cheers Quote Link to comment Share on other sites More sharing options...
magneto Posted November 16, 2011 Author Share Posted November 16, 2011 > make a rectangular polygon > append a convertSOP node ....set its 'convert to' = nurbs curve ....set its 'u order' = 2 i use this method often when nurbs tools are appropriate for certain operations then convert them back to poly-state . .cheers Thanks man, I will give this a try. But this conversion turns the polygon into a shape? I always thought polygons get triangulated and become a mess after converting to nurbs. Quote Link to comment Share on other sites More sharing options...
thekenny Posted November 16, 2011 Share Posted November 16, 2011 well there is always the ancient art of changing the NURBS CV's weight via the pointSOP.... kinda creepy after working with polys so long but that is what it is supposed to do. Quote Link to comment Share on other sites More sharing options...
magneto Posted November 16, 2011 Author Share Posted November 16, 2011 well there is always the ancient art of changing the NURBS CV's weight via the pointSOP.... kinda creepy after working with polys so long but that is what it is supposed to do. Thanks, I will try this. Will the Point SOP only receive CVs from a CV NURBS shape? Quote Link to comment Share on other sites More sharing options...
jim c Posted November 18, 2011 Share Posted November 18, 2011 Thanks man, I will give this a try. But this conversion turns the polygon into a shape? I always thought polygons get triangulated and become a mess after converting to nurbs. No I don't think so - this will create a nurb CURVE as opposed to a nurbs Surface. Also, you could create a 4 pt Curve object, polygon CVs, close it, convert to Nurbs order 2, then add a refine SOP to add the in between points (or alternately a resample, but I think refine works better here). Set the refine sop to work from 0 to 1 in U. If you play with that you should be able to get the points you want, then convert to nurb curve, with order 4 for nice curves? I think this would work. Quote Link to comment Share on other sites More sharing options...
jim c Posted November 18, 2011 Share Posted November 18, 2011 Also, what about the Grid sop!? I forgot, I'm almost positive that can be set to NURBs, as opposed to the polygon it defaults to. Quote Link to comment Share on other sites More sharing options...
magneto Posted November 18, 2011 Author Share Posted November 18, 2011 Very good ideas Jim, I should give them a try and let ppl know Quote Link to comment Share on other sites More sharing options...
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