to low polygons? or non phong tag?

Discussion in 'Technologies and Hardware' started by 3gfisch, Aug 29, 2012.

  1. 3gfisch
    3gfisch New Member
    Hi
    i have printed my fidlrunners turret
    [​IMG]
    [​IMG]
    http://s1.directupload.net/file/d/2997/xhyvoieo_jpg.htm

    but it seams to have to low polygons on the 5cm version or are this "riffles" normal by unpolished wsf? but the smaller version doesn't have this and it looks like my polygons..
    so is there no "phong-tag" like in C4D it rounds all edges between an specific angle for example 10° so a perfect round shape needs only 360/10 36 polygons i think this is awesome for low file size and perfect results can this be done in print process or have i to upload unnecessary big files with high polygons? if this is possible by printing i think this would be a great feature if you can set the phong angel for your project.
    now i update the 3d files for the ball polygons form 80 to 150 is this enough at 5cm diameter?
    thx
    3gfisch
     
    Last edited: Aug 29, 2012
  2. 3gfisch
    3gfisch New Member
    example
    without phong tag / and with
    [​IMG]
     
  3. stonysmith
    stonysmith Well-Known Member Moderator
    No, the Phong tag is not supported.
    You must add additional faces/polygons to increase the level of detail.
     
  4. 3gfisch
    3gfisch New Member
    thx
    would be a great feature i think ^^

    is this enough? is there any rule of thumb how "big" or small one polygon should be on organic or round shapes?
    [​IMG]
     
  5. stonysmith
    stonysmith Well-Known Member Moderator
    Going all mathematical on you.. (Sorry, too much calculus in college)... have you heard of the Nyquist theorem?

    What does this mean for 3d printing?? Is Stony off his rocker? Probably.. but it's actually simple.. to get maximum smoothness out of the printer, the faces should be no wider than 1/2 of the "minimum detail" value. WSF has a minimum detail of 0.2mm.. so your faces should not be more than 0.1mm across.

    I know, that turns what was simple and tiny into a high-poly model, and is above the 1m triangle limit on large items.

    But.. you asked (grin)

    Small note: if you select one of the polished materials, you'll lose some detail, but that also means that you will gain smoothness across these facets.
     
    Last edited: Aug 29, 2012
  6. 3gfisch
    3gfisch New Member
    ok thx :eek: this are much polys :eek:
     
  7. Youknowwho4eva
    Youknowwho4eva Shapeways Employee Community Team
    It's very much like trying to draw a circle with only straight lines. The more lines you use the more circle like it will appear. Easiest thing to do would be to take a piece of sandpaper to your model.
     
  8. 3gfisch
    3gfisch New Member
    Thank you
    But a phong feature would make things easier and files smaller.. ^^
     
  9. Youknowwho4eva
    Youknowwho4eva Shapeways Employee Community Team
    The issue there is the printers that work almost exclusively with STL. And STL only uses polygons. I wish nurbs were supported, but to convert a nurb to CNC (pretty much the same language the printers use) requires a lot of code. I'm more familiar with CNC's that generally use G-code. So you tell the cutter move from point A to point B. So a curve would require lots of short little AB lines to appear round. It would be nice to say go from A to B with R radius, but then you move that into 3 dimensions are it gets a whole lot more complicated.
     
  10. 3gfisch
    3gfisch New Member
    I dont know if i'm right bu i think there must be a program which translates the stl file for the printer and calculate the moving points with acuraty of the printer, and if this calculation not only will calculate the points along the polygon, the calculation culd be improved if you set the phong angle and if two polygons have an lower angle the points will be smooth along thes polygons not straight on in.. Like C4D and other programs can display it in realtime so it suold be not that difficult to calculate the optimized points
     
  11. stonysmith
    stonysmith Well-Known Member Moderator
  12. 3gfisch
    3gfisch New Member
  13. BillBedford
    BillBedford New Member
    Machines don't read phong........