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Sub-D, inset on curved surface?

motives
polycounter lvl 18
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motives polycounter lvl 18
hey hey.. im currently workin on a high-p piece that will require a rectangular inset on a curved surface.. my problem is that i cant find a good meshflow to make this look right w/o pinching. take a look at these example pics:

1. flat surface = inset looks right
cg25kl.th.jpg

2. curved surface (well kinda but u get the idea..) surface gets pinched around inset
cg14hu.th.jpg

so basically im wondering how a good lineflow would look when creating somethig like this to reduce the pinching and still have a sharp inset.

Replies

  • nealb4me
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    nealb4me polycounter lvl 18
    Show us yer wireframe.

    Edit: here try this Save me
  • motives
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    motives polycounter lvl 18
    tnxs for that obj neal, helpful indeed!
    sry about the missing wire heh.. I left it out more cus it looked like a mess of edges rather than a polycage smile.gif

    wire2pd.th.jpg

    anyways, thats the actual object im tryin to get a smooth result on. This is before i started any attempt to "sharpen" it up


    edit: sry bout the pic beeing huge..
  • StrangeFate
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    StrangeFate polycounter lvl 18
    How about
    http://www.strangefate.com/webby/stencil.jpg

    Dunno what it is (guitar?) but even if the surface had to be a bit curved, the wireframe is way noisy, making it not fun to shape.
    If the surface is slightly curved you'll need some vertical edges to define that, and be more carefull than i was when linking vertices.
  • nealb4me
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    nealb4me polycounter lvl 18
    StrangeFate, I hope you don't model like that all the time...:S

    It does look okay, but you create many small imperfections working like that and ends up looking a bit yucky. Especially on more complex or curved geometry.
  • StrangeFate
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    StrangeFate polycounter lvl 18
    i do most of the time, and it looks fine, more complex and and curved geometry will automatically have more complex and curved ground wires to prevent imperfections.
    Obviously, you have to know where and when you can do what.
  • motives
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    motives polycounter lvl 18
    tnxs for the pic SF, interest to look at smile.gif I was under the impression it was best to keep your verts and edges connected and also try stay with quads in areas where u got a lot of complex geo.

    i was tryin some stuff yesterday and came up with this:
    test20ua.th.jpg

    it looks ok but still not "perfect".. especially in the top right corner where the edge of the inset gets really close to the edge of the body.. Suggestions?
  • StrangeFate
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    StrangeFate polycounter lvl 18
    In some cases it's better, in some not. You pretty much have to do whatever it takes, and i usually just do that and not an edge or vert more.

    Quads are great for loops, should keep when roughing out your model so you can sharpen it with loops, otherwise, ngons will give you even better results in some complex areas and get rid of tension in what otherwise would be crowded areas. All depends of what you're doing.
    For the simple example i did you didn't need more.

    A rounded guitar surface is a different story tho.
    Hard to tell the problem from that render, but it would seem that the line that connects the top right side of the box to the edge of the guitar over it is not enough to define the curvature between the 2 points.

    The more dense your mesh is, the more harder it will be to have shapes flow smooth into eachother, and the more vertex pushing you'll have to do by hand to keep the smoothness.

    I think the best solution would be to take the horizontal loop, running on top of the inset box and have it running between the top-right corner of the box and the edge of the guitar, cutting the line that connects guitar and inset in 2. Rather than having the loop flow into the edge of the guitar like now.
    The new vert there should give you more control over the curvature, can move it up a bit to have more roundness and have a softer transition from inset to edge ...if that makes sense.
    Hard to judge all that stuff, usually you deal with problems when you do stuff yourself. Can't say it will work with your topology.

    http://www.strangefate.com/webby/gui.jpg
    i dunno anything about guitars obviously...
  • motives
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    motives polycounter lvl 18
    ah, yea makes sense i guess.. tnxs for the info smile.gif
    i did try and draw the edges as suggested and it did remove some of the pinching! I think im startingt to understand a little more about the smoothing algoritm the more i work with it.. next up is to make some screws (which im sure will be a total pain)

    again tnxs for the help guys
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