From: Rudl 16 Jun 2013  (1 of 33)
 Hi, has someone an idea how I could make planar four-sided figures on the surface of this three sided dome. Attachments:

 From: Frenchy Pilou (PILOU) 16 Jun 2013  (2 of 33)
 5959.2 In reply to 5959.1 All in the same plane or each on a different plane ? Trim each line between them Draw a rectangle by 3 points,select curves of the polygons and project them on the plan or make the same for each polygon , select curves of the polygons and project them on the plan EDITED: 16 Jun 2013 by PILOU

 From: Rudl 16 Jun 2013  (3 of 33)
 Hallo FP, in this way, that the quads form the dome. I´ve done it with another form. But in this case, it seems to be more complicated. Attachments:

 From: Frenchy Pilou (PILOU) 16 Jun 2013  (4 of 33)
 5959.4 In reply to 5959.3 AH ok I see! :) Use the LineWeb script! I had don't remember of it at the first message! ;) http://moi3d.com/forum/display.php?webtag=MOI&msg=3666.10 http://moiscript.weebly.com/lineweb-toile-daraigneacutee.html Video in French bu very visual ! ;) EDITED: 16 Jun 2013 by PILOU

 From: Rudl 16 Jun 2013  (5 of 33)
 Thank you FP, but I have no idea, how to use the lineweb in this case.

 From: Didier 16 Jun 2013  (6 of 33)
 I'm just working on quadrangulate free form on MoI to use it in ParacloudGem... My way is wrapping a squared panel on the free form with the flow v3beta tool. If I want straight lines for the quad, I export in OBJ with 180° to straighten any spline. But the quad are not planar... :( You can easily make planar quad in the second dome because the geometry is made with parallel scaled ellipses, so you can divide each ellipse in the same way and find parallel lines to make planar quads. But in your first shape, I cant see the geometrical way you model it. Is there any scaled curves ? There are arc or free splines ?... Send the file to see ;) [edit : oops... I haven't seen in the first post... sorry] Object made with the first process and : EDITED: 16 Jun 2013 by DIDIER

 From: Frenchy Pilou (PILOU) 16 Jun 2013  (7 of 33)
 5959.7 In reply to 5959.6 < Send the file to see File is on the first post ;) --- Pilou Is beautiful that please without concept! My Gallery

 From: Didier 16 Jun 2013  (8 of 33)
 Did you use only arcs ? So, where are centers and radius ? I think I find something, but can really made a process because I'm not sure of the geometry...

 From: Frenchy Pilou (PILOU) 16 Jun 2013  (9 of 33)
 More easy :) Draw a Plan 3 points Use The CPlane (auxiliar Plane) on this plane Select that you want planar Use the Edit Frame for resize in View Front Reset the CPlane Close holes by Blend That's all ;) here i have taken all the surface but you can take only quadrangles that you want! EDITED: 16 Jun 2013 by PILOU

 From: Frenchy Pilou (PILOU) 16 Jun 2013  (10 of 33)
 But seems planar a curvated surface is not the good thing to make in this case! Make that from the begining with the Line WEB! EDITED: 16 Jun 2013 by PILOU

 From: Rudl 16 Jun 2013  (11 of 33)
 Meanwhile I think, it cannot function.

 From: Michael Gibson 16 Jun 2013  (12 of 33)

 From: Michael Gibson 16 Jun 2013  (13 of 33)
 5959.13 In reply to 5959.11 Hi Rudl, so maybe one feasible manual drawing strategy would be to get some lines drawn in at the 4th quad corner coming off of it like a surface normal, then you can draw in a plane through 3 points and use Construct > Curve > Isect to intersect it with that line, that will then give you the adjusted 4th planar point for one quad, then repeat this across the surface. I'll see if I can give you an illustration of this way. - Michael

 From: Michael Gibson 16 Jun 2013  (14 of 33)
 5959.14 In reply to 5959.12 Hi Rudl, so to start with I'd probably delete many of the curves you've got there since they'll get in the way and also you'll probably want to make sure that the points you have are right on the surface so that you'll be able to get "surface normal snap". Many of the points that you've got there currently are just slightly off of the surface and so you won't get surface normal snap when drawing a line starting on them. So for this point here for example I just deleted it and placed a new one using "onsrf" object snap so I knew that it was on the surface: With the point on the surface, you can then draw a line from it and get "surface normal" snap like this: Here's another view of the same line: So there I enabled the "Both sides" mode for the line, each one of these lines will be a kind of leveling reference line that you can use to find the 4th planar point starting with just 3. Once you have drawn in the surface normal line you can then delete or hide the point, because we will be generating a new planarized point that will be pretty close by it and so you don't want to get them confused. The way to find the 4th point is to start by making a 3 point plane, which you can do either by Draw solid > Plane > 3 points or another way is to draw in 3 lines and select them and run Construct > Planar. Probably hide the big base surface before doing this so it's easier to select and work with the planar fragment. Now you will have something like this - a triangular plane and a vertical line off to the side a bit: You now need to extend the plane until it runs into that vertical surface normal line - probably the easiest way to do that is to just grab the corner edit frame handle which I've circled in red above and just drag that off to the side until your plane is big enough to where you see the vertical line being divided by it like this: Now you can generate the 4th quad point by selecting both that stretched out plane and also the vertical line at the same time and running Construct > Curve > Isect - that will calculate the intersection between the plane and the line and create a point object there. Now you have 4 points that are on one single plane and you can draw lines between them and use Construct > Planar on those lines to build a planar quad face: So anyway this method might be general enough for you to proceed with creating planar quads across the area that you want, start by placing points directly on the surface, maybe one by one delete each one you've currently got and replace it using "onsrf" object snap in the same general location. Then draw in surface normal lines and delete the on-surface points. Then it's possible to start with one 3sided plane and get an adjusted planarized 4th point by extending the plane and generating the intersection point. Let me know if this does not do what you need. Basically paneling tools in Rhino would probably automate a bunch of this for you. - Michael

 From: Rudl 16 Jun 2013  (15 of 33)
 Hi Michael, thank you for your comprehensive answer. I will read it later. Meanwhile I think, I came nearer to a solution. I draw lines and projected them on the surface. The result is very good, accept the ends of the projected lines, the red circles shows it, should meet themselves where the arrow is. Any suggestions? Rudl Attachments: Image Attachments:

 From: Michael Gibson 16 Jun 2013  (16 of 33)
 5959.16 In reply to 5959.15 Hi Rudl, the problem with the projection method that you show there is that while yes you're getting 4 sided areas, the sides are all curved and the 4 corner points are not going to be all one one single plane... Is a result like that ok for what you need or do you need to have 4-sided planar pieces which is what I thought you were looking for? - Michael

 From: Rudl 17 Jun 2013  (17 of 33)
 No, it was not that what I´m looking for. I thought, this could be the way how planar quads should be located. But they don´t want. Rudl