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ptc-50078001-Visitor
1-Visitor
March 12, 2013
Question

Reg: creating a pattern in sphere

  • March 12, 2013
  • 9 replies
  • 12746 views

I tried to create a golf ball, but after creating a sphere i thought of creating a small hole and then by giving a pattern i thought i might get it, but am not able to create a pattern as it is seen in Golf.. how do i create it??images.jpg


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9 replies

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
March 12, 2013

I have a link soomewhere for this, I'll try and dig it out. I never tried it though.

    P
    ptc-50078001-VisitorAuthor
    1-Visitor
    March 13, 2013

    thank you.. i'll be waiting...

    T
    TomD.inPDX17-Peridot
    17-Peridot
    March 13, 2013

    It kind of depends on which pattern you subscribe to. Wiki has a good guide image: http://en.wikipedia.org/wiki/Golf_ball

    Have you considered creating an appropriate texture

    Wouldn't a "fill" pattern work?

    P
    ptc-50078001-VisitorAuthor
    1-Visitor
    March 13, 2013
    Texture i have created but i am not sure whether its perfect, but even after creating a texture the coincident points in the texture, i need to make a point in there and have to create a hole, but i tried it.. it didnt come as well..and as for the fill pattern is considered we have to create a hole in the texture only then fill pattern can be applicable. If you know how to create a proper texture ( like in wiki ) in it, help me with the answer i'll give it a try..
    T
    TomD.inPDX17-Peridot
    17-Peridot
    March 13, 2013

    A texture is an image that can be wrapped onto the surface of the sphere. With a little effort, you can even have the rendering engine mimic the dimple "look". Unfortunely it will not do much to help create the actual dimple feature.

    I'll see how close I can come to this. Sounds like an interesting challenge.

      Patriot_1776
      Patriot_177622-Sapphire II
      22-Sapphire II
      March 13, 2013

      I got this a long time ago, and never looked at it:

        T
        TomD.inPDX17-Peridot
        17-Peridot
        March 13, 2013

        That model was a lot of effort by someone. I wonder how those pattern tables were generated.

        Very nice work, whoever did it (the History interrogation still doesn't work in Creo 2.0 M040).

        It does return a username EBOWERMAN.

          T
          TomD.inPDX17-Peridot
          17-Peridot
          March 13, 2013

          So I started here and it certainly is not complete.

          I used the Wiki example on the left as a guide. This creates a 252 hole golf ball.

          http://upload.wikimedia.org/wikipedia/commons/f/f0/Two_similar_icosahedron_golf_ball_designs.jpg

          I am only using this as a skeleton starting point. The dimple sizes are not optimized nor is the size.

          Reverse engineering both images shows that it is based on a nested set of 12 pentagons and 20 triangles. With Pro|E (all versions) you can assemble these shapes and they end up locking themselves into the proper form.

          From the assembly I drove a sketch back to the pentagon to determine the height of the 5 triangles on the pentagon so I could determine the diameter I ended up with. Again, none of the holes are optimized as yet.

          252_hole_golf_ball.JPG

          The idea is that you want to be able to define this shape within a part file and not an assembly. Holes, or points, still have to be mapped on a sphere. The dimple sizes are not consistent... you see the full scope of the challenge. And this is not even the definitive standard for golf balls although I do like this one for the challenge at hand.

          The next level of subdivisions should determine exactly where the dimples should fall. In that way, points could be added to determine the appropriate location on the sphere.

            K
            knorman1-Visitor
            1-Visitor
            March 13, 2013

            The pattern of the dimples in the picture that you supplied actually looks pretty simple when looking at it through a spherical coordinate lens. My first approach would be to use another program (Python, MATLAB, Excel, etc.) to calculate the locations of all the points of the dimples and save the points in a separate file. I would then have pro/e load those points with the Offset Coordinate System Datum Point Tool (I think... I have never tried this). I would then make one dimple feature, and use the point pattern tool to fill the rest of the dimples.

            I think this would work to make a ball in the image that you attached. You would quickly run into logistical issues if trying to replicate the ball the Frank attached. You could probably still use the method, but you would likely have to break it into smaller pieces.

            When I find some time, I might have to give this a shot. I will let you guys know how it goes.

              V
              VladimirPalffy14-Alexandrite
              14-Alexandrite
              March 14, 2013

              Hi All,

              here is my model of golf ball: GOLF - Gentleman Only, Ladies Forbidden?

              Vladimir

                D
                DavorGranic16-Pearl
                16-Pearl
                March 14, 2013

                http://communities.ptc.com/message/165911#165911

                Scroll down and you`ll see golf ball with explanation. I`ll see if i can find my old model from this post tommorow.

                  T
                  TomD.inPDX17-Peridot
                  17-Peridot
                  March 15, 2013

                  Mani, you have unintentionally started a surprisingly challenging discussion and quite a few off-shoots.

                  And since you started it, I should follow up. I spent most of the week trying to "understand" the problem rather than just making due. Between the challenge itself and making Creo do what it should really did provide a lot of insight and even frustration.

                  This is what I ended up with: 260 dimples on a 1.68" sphere. This model is attached as a STEP file.

                  ICOSA_Dodec_golfball.JPG

                  I ended up using 3 levels to manage the point plotting onto the face for patterning. This technique could be used for any pattern, but I choose the Wiki version with a few extra holes at the centers of the resulting hex pattern.

                  The 1st level was as discussed before, a modified dodec/icosahedron (32 faces).

                  ICOSA_Dodec_hybrid.JPG

                  I was finally able to generate this shape with a comprehensive sketch that controls planes from which the "fill" patterns were created.

                  ICOSA_Dodec_hybrid_core.JPG

                  Next, I needed to stellate one of the pentagons. Through the sketch, I was able to determine the of the center on the bounding sphere. Then 2 key sketches were created to determine the centers. These odd sketches will determine the "centers" of the dimples at the points of the pie shaped pieces.

                  ICOSA_Dodec_hybrid_locator_sketches.JPG

                  A surface sphere of the final size was created. These sketches were used to create Offsets. This provides Vertexes to use for patterning later on. The offsets were patterned on a hemisphere.

                  ICOSA_Dodec_hybrid_locator_offsets.JPG

                  Now, 95% of the work is done. I have vertex locations on the sphere surface. Next a solid sphere is created and a 1st dimple is revolved from the solid face.

                  ICOSA_Dodec_hybrid_1st_dimple.JPG

                  Now, I -thought- I could make datum points on the surface using the "darts" I created. But patterning to those points does not maintain a surface normal. All the axes of the pattern became unidirectional without options. Even if I tried to orient the points, no joy. The answer was to map the points onto a sketch in the pattern command. This was easy enough. Now you have the options of mapping to surface normals. remember to choose the Origin as well.

                  ICOSA_Dodec_hybrid_pattern_dimples.JPG

                  Now I am able to modify the 2 simple sketches above and optimize the distribution of the dimples by tweaking the sketch constraints. You will notice I used one size dimple. Even greater optimization could be done if you separated the dimple creation in 2 steps.

                  From here, this patterns were copied, pasted w/ 180 degree rotation, grouped, and rotated about an axis 5 times. And last, the fillets were added.

                  To clean up the file, I hid all the reference geometry and also the 260 axes that were created from the dimple cuts and saved the layer status.

                  And the end result is attached

                    K
                    knorman1-Visitor
                    1-Visitor
                    March 15, 2013

                    Very impressive work. Just creating the modified dodec/icosahedron requires a bit of thought and foresight, not to mention the path you took to complete the other two steps. Awesome model!

                    A ball with some dimples... How hard can that be? Oh... Wait...

                    T
                    TomD.inPDX17-Peridot
                    17-Peridot
                    March 16, 2013

                    Thanks Kyle!

                    V
                    VladimirPalffy14-Alexandrite
                    14-Alexandrite
                    March 16, 2013

                    Spherically pattern - new pattern for Spherically shape

                    What do you think? It is good idea for new feature in Creo? - Vote here

                      T
                      TomD.inPDX17-Peridot
                      17-Peridot
                      March 16, 2013

                      Ideas should be a bit more descriptive, so I added a comment. Maybe you could add it to the idea.

                      Spherically pattern - new pattern for Spherically shape

                        D
                        DavorGranic16-Pearl
                        16-Pearl
                        March 21, 2013

                        Trick is to make half sphere not whole sphere and then project pattern on to it. Fill Pattern type must be circular. First dent u create in center of halfsphere surface. when you complete halfsphere you just mirror it.

                        Now comes problem with distance between pattern items on 1 halfsphere and other. You must use a bit of math in relations to achive nearly perfect ball.creo+golf+ball.jpg

                        Here is the model:

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