How do I fix these corner gaps?

Discussion in 'Design and Modeling' started by DrBill37, Nov 26, 2012.

  1. DrBill37
    DrBill37 New Member
    Hello

    Can someone please tell me what approach is needed to fill in the gaps seen in the attached model of a cube? Is there some magical MeshLab filter that can be used to do this? -I've tried a few with no luck (Convex Hull fills them in but creates a snubbed cut off corner, whereas I need the edge to be a sharp corner.

    thanks
    Bill
     

    Attached Files:

  2. stonysmith
    stonysmith Well-Known Member Moderator
    Meshlab is not going to be of any benefit here.. you need a program where you can edit individual vertexes.
    I used Truespace, but Blender and several other programs can likely do this.
     

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  3. Fredd
    Fredd New Member
    It seems it would be close to impossible to make manifold with beveled corners. I know that in blender you can chamfer(bevel the corners) on a cube, insetting the sides of the cube at the same angle will cause a mess. Let me work up a possible option
     
    Last edited: Nov 26, 2012
  4. DrBill37
    DrBill37 New Member
    Hey

    This looks really good, but how exactly did you do this with TrueSpace? -I wasn't aware of TrueSpace but I do have Blender -what I am missing are those critical keystrokes to make whay you did happen...

    much appreciated
    Bill

    P.S.
    I'll get a copy of TrueSpace.

    .
     
  5. DrBill37
    DrBill37 New Member
    Hi Fredd

    I look forward to what you come up with. It seems I have everything to learn when it comes to 3D modelling.

    thanks
    Bill
     
  6. stonysmith
    stonysmith Well-Known Member Moderator
    You have to have Truespace 7.6.0 (not 7.6.1) to import/export STLs

    Your model was made up of several overlapping shells. I first ran it thru Netfabb Cloud to turn it into one shell.

    Then I imported it into Truespace, and un-rotated it so that the sides were perpendicular to the X/Y/Z axes.

    I then turn on the Object Info panel so I can see the coordinates of what I'm working on.

    From there.. I go into Edit Vertex mode, select a point that was sunk in, and then type in the coordinates to get it to the right spot. in this case [X,Y,Z]=[12.4,12.4,12.4] and so forth. I figured out those values by selecting other points around the model for where I wanted it lined up.

    This method is reasonable if you're fixing 8 only points. It's a bit tougher if you have half a million vertexes to fix. <GRIN>
     
  7. Fredd
    Fredd New Member
    Well I hope this was the look you wanted. Even not it is cool.
     

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  8. DrBill37
    DrBill37 New Member
    Hi Fred,

    -Very cool looking indeed. Alas, StonySmith provided an example which has addressed how to close those open corners with straight edges, essentially completing the geometry. Your result is prettier and more complex but (as a newbie) I am trying to learn the techniques of how to do this. Right now, I am trying to keep it simple (which is nearly impossible).

    Anyway, your fine effort will join my personal collection :)

    thanks
    Bill
     
  9. DrBill37
    DrBill37 New Member
    Hi StonySmith

    Me again :)

    >>You have to have Truespace 7.6.0 (not 7.6.1) to import/export STLs

    -Located, downloaded, installed v 7.6.0

    The app is a bit of an eye-chart with all of those tiny icons, but looks very powerful (once you know what you're doing of course)

    >>Your model was made up of several overlapping shells. I first ran it thru Netfabb Cloud to turn it into one shell.

    -I repeated this step with my original model, amazed at how fast the processing/turnaround time is on NetFabb Cloud!

    >> Then I imported it into Truespace, and un-rotated it so that the sides were perpendicular to the X/Y/Z axes.

    -I imported the STL and (after some floundering around) got the hang of the clever little rotation widget and reoriented the model.

    >>I then turn on the Object Info panel so I can see the coordinates of what I'm working on.

    I had this open at one point but it vanished and I couldn't seem to get it back. Is there a shortcut key combo for that panel?

    >>From there.. I go into Edit Vertex mode, select a point that was sunk in, and then type in the coordinates to get it to the right spot. in this case [X,Y,Z]=[12.4,12.4,12.4] and so forth. I figured out those values by selecting other points around the model for where I wanted it lined up.

    -I actually got into edit mode and was able to select the recesssed point and extrude it as a test, but got lost when it came to identifying the coords you point out. I now have a much better idea, however, of what you did to extrude the recessed vertex. I just could not get that last step.

    Another test (if you have the time to spare). I have attached another STL which has small indentations (squares/triangles depending upon which vertex). Within TrueSpace, I used the rectangular selector in edit mode and can highlight these regions but now I need to know how I can extrude them, fill them in -or whatever- to make them go away. I've attached an STL that has already been cleaned on NetFabb Cloud, if you could please take a look at it. I would sure like to know if there is a general way of fixing these things, something like the healing brush in Photoshop, but for meshes would be perfect. or some global thing I could do to the object. Anyway, I'd appreciate your advice on how to do this.

    many thanks for helping
    Bill


     

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  10. JACANT
    JACANT Well-Known Member
    The easiest way to do this is to create 'spheres' of the same diameter as the 'pipes' and 'Boolean Union' them together. Have a look at this model. That's how I did it.
    http://www.shapeways.com/model/772608
     
    Last edited: Nov 27, 2012
  11. DrBill37
    DrBill37 New Member
    Hi Rob,

    What you have done is exactly what I am after. What tool did you use to add the spheres you mention?

    thanks
    Bill

    P.S.
    Very nice geometry on the pendant.
     
  12. Fredd
    Fredd New Member
    Thank you Jacant. The tip about using dupliverts and booleans is superb . I can get some use now out of extruding edges in Blender now
     
  13. JACANT
    JACANT Well-Known Member
    Hi Bill,
    It depends on what software you are using. I use AutoCad.