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Thread: Smooth blend of a cylinder and a wedge

  1. #1
    May the sauce be with you starbase1's Avatar
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    Smooth blend of a cylinder and a wedge

    I'm trying to work out a way to smoothly blend a sort of wedge shape with a cylinder. (Image attached)

    I've not gone too far to start again is that makes things better.

    It may look scifi, but this is a serious proposal for a reusable sounding rocket. And the tubular forward hull needs a smooth join to the wedge shaped main body.

    I tried some combinations of boolean and rounder, but as usual, I got a crashy mess.
    Has anyone got an elegant way to smooth the area where the two shapes meet?

    All clues very gratefully received.
    Nick

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  2. #2
    It could be done with sub-D, if you used the Edit Edges tool to add edges along the triangle's sides that line up with the tube. You could boolean the two shapes or add an edge around the tube and manually slide each point to be close to the edges on the sides of the triangle. Use tools such as slice to manually cut... actually, it's hard to explain. I might try to do a quick example.

  3. #3
    Sorry, I did it but there are 25 pages of screen captures and it's too much work to turn that into a step by step right at the moment. For the time being I'll give you the model as it might help to look at it.

    Basically I used add edges and also the slice tool, and a bit of fiddly stuff re-directing edge loops and tris at the connection points.

    Blend shapes together.zip

    And Multi-Shift as well.

  4. #4
    Axes grinder- Dongle #99
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    This looks like a task for a non-polygonal modeling tool.
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  5. #5
    gettin all wavy rwhunt99's Avatar
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    Is it totally Sub-D? or polygonal? I think you could take the panels and break them up, it would only add about 24 poly's to the model but if you have to have nothing but four point poly's or it has to be sub-D'd then it might not be the best solution. it might add way too many poly's to the model.

  6. #6
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    Not elegant, but straight forward work.

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    But, yeah, probably easier to model with splines and patch.

  7. #7
    Axes grinder- Dongle #99
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    A few more views would help. I think I'll take a swing at this...

    What would REALLY be interesting is a RACE (at least, elapsed times) for various solutions in different apps.
    They only call it 'class warfare' when we fight back.
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  8. #8
    I thought I had kind of solved it.

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    Of course that 3rd powers plugin would make short work of it.

  9. #9
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    Quote Originally Posted by djwaterman View Post
    I thought I had kind of solved it.

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    Of course that 3rd powers plugin would make short work of it.
    Pretty much the same conclusion I came to. I saw this at work and couldn't open the zip cause my LW seat is at home.

  10. #10
    May the sauce be with you starbase1's Avatar
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    Wow! Thanks for all the responses!

    I have to admit I'm not clear on how all this was done. I'll post files with the base shapes later, so people can play with the source material.

    Nick
    Faith is the opposite of Intelligence.

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  11. #11
    May the sauce be with you starbase1's Avatar
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    basic-shapes.zipbasic-shapes.zip

    OK, here are the base shapes, thanks all!
    Faith is the opposite of Intelligence.

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  12. #12
    May the sauce be with you starbase1's Avatar
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    In case anyone is interested, this craft is an update on a project I did a while back, for a real re-usable sounding rocket. The new version is a lot bigger, (now 15m long), and as you can see has added a nose section. The idea is that you can use different numbers of engines, or even strap 3 together if you need a lot of thrust.

    Nick
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  13. #13
    it's a manhole cover ↓ JoePoe's Avatar
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    My guess is that DJ's solution (I like the second one better) is a manipulation of the points of a single tube object knifed to get the diagonal (with a multi-shift or two in the top flat and a rounding on the diagonal). Not a combination/union of separate shapes or elements.
    It's all quads so it could be subD'ed but it's dense enough that it's also fine as polys.
    Last edited by JoePoe; 03-16-2015 at 09:09 AM.
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  14. #14
    If you look at the model file, the four layers sort of show the stages, but the last steps were pretty fiddly, I didn't use boolean, I sort of did a manual boolean, slicing and cutting away the sections that intersect, and manually knitting the points together. You could do it with boolean too I think, I can't remember why I chose not to.

  15. #15
    May the sauce be with you starbase1's Avatar
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    OK, thanks for the explanation.

    I might even be able to just scale your one to match my bits!
    Faith is the opposite of Intelligence.

    Touched by his noodley appendage!
    My Lightwave Graphics & Downloads!!!

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