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assign thickness to surface
mykola_kulishov
Member Posts: 12 ✭
Few days ago I asked for an advice and help. Simon suggested to use a different approach, so I did it differently but still I can not Thicken this surface. What I am doing wrong. Is there anybody can help me ?
https://cad.onshape.com/documents/a8d1738fdb62afbeece12073/w/67a4671428ef7dd3f5bd2cdf/e/578c3b363217d3f708e8ea85?renderMode=0&uiState=66ff04db77d1c31474171d06
Thanks in advance,
Mykola
Best Answers
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MDesign
Member Posts: 239 ✭✭✭
I think you have to model the transition from concave to convex separately. while in theory if you can nail a loft profile on the exact transition of convex to concave it might work, that seems impractical if not impossible…In this pic you can kinda see what i did to make it work. its not "clean" because I spent no time trying to make things tangent but you can see you can get pretty close. with a little effort. a lot more effort and time and trial/error can be spent to refine and make the transitions of the surfaces more smooth.
An alternative might be to model 2 surfaces (one convex one concave), array them, boolean them, thicken the surface, and then fillet that transition to smooth it out if it will let you. Haven't tried that.
Personally Hindsight 20/20 it might be better to make a revolve solid up to the point where things need to transition from concave to convex and then work with surfacing tools from there. just my humble opinion.
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MDesign
Member Posts: 239 ✭✭✭
Nice work. that point where you have the mate connector and a sharp v like edge is the problem area. getting that to "transition" from concave to convex causes issues while maintaining a nice smooth edge. intriguing challenge for sure.
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Answers
How much are you trying to thicken? Looks like something is self intersecting or the like a thicker sections.
https://cad.onshape.com/documents/97a285e06d4a50aaa595c4c2/w/881ae3e134c4ffbb471ae7cb/e/3fd50f979b1c6e019f0d85cb
Hello Glen, it is a surface now. I would like to have, let say 3 mm thickness. This bowl has 60 degree rotational symmetry, so I made 60 degree surface using loft, them mirrored to 120 degree, and then rotationally arrayed it, then I merged all surfaces into a single one. It should not be anything self intersecting.
It's probably getting confused when the material flips over this tight here….
Hello Justin, thanks for a quick response. I do not see such a gap. I wonder if you can tell me what I was doing wrong. It is not very complex surface, so why I can not thicken it?
Hi Mykola
My description of self intersecting falls a little short on what is happening. I've done another version that does not and will not Boolean together. I did a 12mm thickness of a single leaf that makes in easier to see where the thicken feature is trying to fold over on it's self and collapses in on it's self. Mirror and circular pattern produce nonmanifold conditions when trying to Boolean. Add or subtract in previous features give the same result as Boolean with out the added feature in the tree.
Note that the initial thicken fails on a single leaf when maximum thickness is reached. Look also at the waviness along edges to see above conditions. These conditions apply for thicken whether positive or negative. Just the maximum thickness before failure.
There is others on the forum that are better at helping you to get the surfaces working better.
https://cad.onshape.com/documents/97a285e06d4a50aaa595c4c2/w/881ae3e134c4ffbb471ae7cb/e/3fd50f979b1c6e019f0d85cb
Already answered in the other thread, there is a very tightly curved bit of surface in there that you need to get rid off before you can thicken the surface
Thanks Glen for your help! Unfortunately, I need a smooth edge in this bowl. I am thinking about making a mold for bronze casting. I will keep working, but eventually i might need somebody professional to help. I am ready to pay if it is reasonable. Thanks again.
It's not a gap but a very tight rollover of the surface that cant be offset but by the smallest of thicknesses. if you try something very small like .01mm it thickens
I think you have to model the transition from concave to convex separately. while in theory if you can nail a loft profile on the exact transition of convex to concave it might work, that seems impractical if not impossible…In this pic you can kinda see what i did to make it work. its not "clean" because I spent no time trying to make things tangent but you can see you can get pretty close. with a little effort. a lot more effort and time and trial/error can be spent to refine and make the transitions of the surfaces more smooth.
An alternative might be to model 2 surfaces (one convex one concave), array them, boolean them, thicken the surface, and then fillet that transition to smooth it out if it will let you. Haven't tried that.
Personally Hindsight 20/20 it might be better to make a revolve solid up to the point where things need to transition from concave to convex and then work with surfacing tools from there. just my humble opinion.
Yet another option is just to leave the transition open to be modeled with lofts or surfacing tools
Thank you very much Justin,
I do not have much experience in 3D modeling, it is only about three months since i started playing with it. My age is also a factor, the brain is not the same at 68 :-) Is there a chance that you can give me a link to the model where you assigned thickness? I do not need very smooth transitions.
I will try to follow your advice. Thanks again, Mykola
Here ya go. I got most of the tangency worked out. but not all. If I had more time I probably could figure the rest of it out.
https://cad.onshape.com/documents/b19b49857247166c148f9ecb/w/68a0a3d028c16cd2c5daf21d/e/e97e015381a60634ca313bd0?renderMode=0&tangentEdgeStyle=1&uiState=6704b8650e2a684a47ac004d
This kind of intrigued me so I played with a for a bit. Then did a little rethinking and started fresh. Wondered how much I could reduce feature tree, planes and get away with not using 3d curves. The curves and lofting were giving me trouble. Thought the new control point curve might help, but no. I think the result isn't to bad. Using your 3mm thickness no problem. Playing with sketch 2 to define a split was a bit tricky. Put in what ever curves you need to sketch2 to get the final shape. Handy with final bottom checked to see results of sketch2 changes Seems to be more robust.
Nice work. that point where you have the mate connector and a sharp v like edge is the problem area. getting that to "transition" from concave to convex causes issues while maintaining a nice smooth edge. intriguing challenge for sure.
Hello Justin,
Thanks a lot for your help. Sorry that did not reply right away.
I tried a different approach to get the same shape. I was able to get it into a single part. The only problem that I could not apply fillets, but is is not big deal. My gratitude also to Glen! Have a great day. Mykola
https://cad.onshape.com/documents/a92ffe9b217eb3212db92402/w/fc8c3deb8a849d6886ada37b/e/f62b44d1c17138544fd8a7e2?renderMode=0&uiState=6706196c8d8fb76cb15f8463
I like your new sculpting. Makes a much more decretive feel.