Channel Band Tutorial 1-4  5-24  25-42

 From: hep 21 May 2007  (5 of 42)
 Now i just need the diamonds to make the perfect gift for my wife :-)

 From: Jesse 21 May 2007  (6 of 42)
 623.6 In reply to 623.4 Hi Michael, Thanks, I think I'm starting to get the hang of MoI :-).. I mean, I'm learning to make the best use of the drawing tools, especially the construction lines. What I used to do in two or three separate steps, I can knock out with two or three construction lines, right within a single operation. I actually tried to use curve Booleans instead of solid to punch out the holes for the stones, but they cut through both sides of the ring... so unless there's an even number of stones, it seems like you have to use solid Booleans. I don't know how practical it would be, but could you put in a option for a distant limit to Curve Booleans subtract from solids? So for instance, if the band was 2 mm thick, that I'd want the curve to cut 3 mm deep, so it punches out a hole on one side of the ring, but not the other. If you don't mind, I'll send you my tutorials before I add the text, so you can point out if there's an easier way to accomplish something...and if you happen to notice something in the ones I've already posted, don't don't hesitate to let me know... MoI already allows me to do a lot of things faster, so if I can learn even more efficient techniques, that's even better! Jesse

 From: Tim (BLADEST) 21 May 2007  (7 of 42)
 Hi Jesse, very good tutorial, where did you get the stone mesh from? regards Tim. ps iI also have a question about how to make the square offset prongs you did some time ago, I have a way to do them by making a pyramid with Network and then moving across decreasing layers of control points but it is very tedious . I tried to construct from one square to another offset square but it was a pain getting the s shaped uprights to fit and be smooth regards Tim.

 From: Jesse 21 May 2007  (8 of 42)
 623.8 In reply to 623.7 Hi Tim, Thanks...I'm not sure where the stone mesh came from...I picked out of an old model I had in my projects folder. Here is a 10 mm version, you can scale it by percentage to get whatever size you need...so like for a 1 carat, scale it by .65 If I remember correctly...I think the prong is the type you'd make by blending two curves to get the "S" shape and then sweeping cross-sections on it. I drew an arc on the side of the finger circle where I wanted the prong to start and then a straight line above the place where I wanted the prong to end and did a blend curve between them. My angle is little off on the top square, but this is the general idea. Also, if you do a G3 blend, it will make smoother surfaces. Jesse EDITED: 21 May 2007 by JESSE Attachments:

 From: Frenchy Pilou (PILOU) 21 May 2007  (9 of 42)
 Just a little question :) --- Pilou Is beautiful that please without concept! My Gallery Attachments:

 From: Tim (BLADEST) 21 May 2007  (10 of 42)
 Thanks Jesse, I have been using a plain revolved shape , the cut stone looks a lot better. I don't seem to think of using blend, I will try it out a bit more, ther are so many different ways of doing things , I keep trying to use what I have just learnt! regards Tim.

 From: Jesse 21 May 2007  (11 of 42)
 623.11 In reply to 623.9 Hi Pilou, You are very observant! :-) Possibly they made every other one flat so the stone would look rounder? I don't know. There are very precise proportions which optimize the refraction of light in an "Ideal Cut" round diamond.. it's sort of a science. The Modern Brilliant cut is supposed to be optimized for how light reflects based on the crystalline structure of the molecules, but most diamond cutters balance the ideal with economy for all but the best stones.. they are careful not to cut away too much material, thereby reducing the carat weight and cost to the customer. :-) http://en.wikipedia.org/wiki/Round_brilliant http://diamonds.pricescope.com/girdle.asp A 3D viewer for diamond models http://www.octonus.com/oct/products/3dcalc/standard/ There are free meshes of gemstones on this site, http://www.3dlapidary.com/HTML/Collections.htm but unfortunately they aren't in a format that MoI can open. Jesse

 From: Michael Gibson 21 May 2007  (12 of 42)
 623.12 In reply to 623.6 Hi Jesse, > I don't know how practical it would be, but could you put in a option for a > distant limit to Curve Booleans subtract from solids? This definitely makes sense, but since there is a pretty good workaround of just making solids as cutters, it will probably be a little while before I'm able to schedule time to work on that. One thing I'm not sure about - in solids modelers often times the extrude tool is used for this type of cut, where the extrude can be used to add or remove material from an existing solid instead of creating a brand new object.... I'm not sure which one is best for this option, boolean difference or extrude. Maybe both should have it? > If you don't mind, I'll send you my tutorials before I add the text, > so you can point out if there's an easier way to accomplish > something... Certainly! But I think it looks like you've got things handled! But watch out, once you've got fully hooked on MoI you may get grumpy when you need to use other software.... ;) Your last one really did give a feeling like you've gotten comfortable using things in an optimal way. I guess there can actually be a problem with this in a tutorial because some things like construction lines are so easy to create that they kind of appear somewhat magically in the middle of the tutorial without someone really knowing how they got there. Hopefully this will get addressed when I have some more detailed documentation and additional videos over some specific areas like construction lines. Those will probably round out other tutorials like yours pretty well. - Michael

 From: Frenchy Pilou (PILOU) 22 May 2007  (13 of 42)
 623.13 In reply to 623.11 Thx for explanations & sites :) --- Pilou Is beautiful that please without concept! My Gallery

 From: Frenchy Pilou (PILOU) 22 May 2007  (14 of 42)
 623.14 In reply to 623.11 < but unfortunately they aren't in a format that MoI can open. http://www.3dlapidary.com/HTML/Collections.htm Curious there are some in 3Dm format Look at the end of the page many model can be load in 3dm formats but effectively can't be open in Moi @Michael Why? There are some 3dm format? These seems for Rhino 2 Can't be open in Moi :( --- Pilou Is beautiful that please without concept! My Gallery Attachments:

 From: Michael Gibson 22 May 2007  (15 of 42)
 623.15 In reply to 623.14 Hi Pilou, it's because the objects are stored in the .3dm file as a polygon mesh object, not a NURBS object. MoI will only read NURBS objects out of .3dm files, it skips over polygon mesh objects. - Michael

 From: Frenchy Pilou (PILOU) 22 May 2007  (16 of 42)
 623.16 In reply to 623.15 Ok ! So 3dm can save 2 different sorts of "curves" minimum (?) Betrayed by the name :) --- Pilou Is beautiful that please without concept! My Gallery

 From: Michael Gibson 22 May 2007  (17 of 42)
 623.17 In reply to 623.16 > So 3dm can save 2 different sorts of "curves" minimum (?) Well, the other type of data is not curves, it is a faceted polygon mesh, just triangles and quad polygons like for example what is exported to OBJ format from MoI normally. There are actually several different types of objects that can be stored in .3dm files, like NURBS, polygon meshes, lights, annotation dimensions, ... MoI will only read out the NURBS objects right now. - Michael

 From: Jesse 22 May 2007  (18 of 42)
 623.18 In reply to 623.17 Hi Michael, Since you can extract points from the meshes in Rhino, if someone wants to build NURBS surfaces from the points for some of the more commonly used gemstones, they could. I'll upload some files with points if there's any interest. Jesse Edit: I looked at some of the meshes and it seems that unless you work right off the mesh to build surfaces from points, it could be confusing to know which points get connected by lines, so it has to be done in Rhino...I'll do a few of the basic ones. EDITED: 22 May 2007 by JESSE

 From: Michael Gibson 22 May 2007  (19 of 42)
 623.19 In reply to 623.18 Hi Jesse - since these shapes are actually intended to be faceted objects, this is one of the few cases where using the "MeshToNurb" command in Rhino will work really well. To convert it, don't bother with extracting points, just select the mesh stone, run MeshToNurb on it in Rhino, and export the resulting NURBS model. This will convert each polygonal face into a (potentially trimmed) NURBS surface. - Michael

 From: Ken (JWLRYMKR) 22 May 2007  (20 of 42)
 623.20 In reply to 623.19 Very cool tutorials Jesse! Thanks. I learn something new everytime I see your stuff. Regards, Ken ____________________ Regards, Ken http://www.3dcadjewelry.com/

 From: Jesse 23 May 2007  (21 of 42)
 623.21 In reply to 623.19 Hi Michael, I didn't even think of that. It was very easy! DivShare File - gemstones4MoI.zip Jesse P.S. I can't seem to get the URL to post as a hyper-link to open up the download in a new page...the forum editor is correcting the code even though I checked off submitted code, so I've posted it as a direct link. When I put the tags on it, the page keeps changing this "> to this " /> This is the URL link I wanted to make into a hyper-link- [url=http://www.divshare.com/download/718753-487]DivShare File - gemstones4MoI.zip[/url] DivShare File - gemstones4MoI.zip EDITED: 23 May 2007 by JESSE