[OpenSCAD] No rendering when using difference

Hans L thehans at gmail.com
Mon Oct 29 14:26:21 EDT 2018


It looks like you are using quads for most of the polyhedron (except for
the top and bottom faces), but it appears that quads on the end are not
planar.
You should split these bits into triangles to avoid any issues like this.


With that being said, it does appear to render fine for me on Windows,
using a dev snapshot 2018.06.01 (git 4455a12)


It does give a warning but seems to be able to handle working around it:

"PolySet has nonplanar faces. Attempting alternate construction"




On Mon, Oct 29, 2018 at 12:14 PM <seb.belese at laposte.net> wrote:

> Hi,
>
> I am new to OpenSCAD, and I built a polyhedron which I can render with no
> problem.
>
>
> However, when I try to substract a cylinder from it, I can visualize it
> (F5), but not render it (F6): the resulting render is empty. I have seen
> some similar problems from other people, but usually when importing stl
> files. The code is below (sorry for the complexity, the shape of the
> polyhedron was generated from outside).
>
>
> Is there something wrong with the code? Do you encounter the same issue?
>
>
> Thanks for any help,
>
> Sébastien
>
>
> difference() {
>     polyhedron(faces = [[19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
> 6, 5, 4, 3, 2, 1, 0], [0, 1, 21, 20], [1, 2, 22, 21], [2, 3, 23, 22], [3,
> 4, 24, 23], [4, 5, 25, 24], [5, 6, 26, 25], [6, 7, 27, 26], [7, 8, 28, 27],
> [8, 9, 29, 28], [9, 10, 30, 29], [10, 11, 31, 30], [11, 12, 32, 31], [12,
> 13, 33, 32], [13, 14, 34, 33], [14, 15, 35, 34], [15, 16, 36, 35], [16, 17,
> 37, 36], [17, 18, 38, 37], [18, 19, 39, 38], [19, 0, 20, 39], [20, 21, 41,
> 40], [21, 22, 42, 41], [22, 23, 43, 42], [23, 24, 44, 43], [24, 25, 45,
> 44], [25, 26, 46, 45], [26, 27, 47, 46], [27, 28, 48, 47], [28, 29, 49,
> 48], [29, 30, 50, 49], [30, 31, 51, 50], [31, 32, 52, 51], [32, 33, 53,
> 52], [33, 34, 54, 53], [34, 35, 55, 54], [35, 36, 56, 55], [36, 37, 57,
> 56], [37, 38, 58, 57], [38, 39, 59, 58], [39, 20, 40, 59], [40, 41, 61,
> 60], [41, 42, 62, 61], [42, 43, 63, 62], [43, 44, 64, 63], [44, 45, 65,
> 64], [45, 46, 66, 65], [46, 47, 67, 66], [47, 48, 68, 67], [48, 49, 69,
> 68], [49, 50, 70, 69], [50, 51, 71, 70], [51, 52, 72, 71], [52, 53, 73,
> 72], [53, 54, 74, 73], [54, 55, 75, 74], [55, 56, 76, 75], [56, 57, 77,
> 76], [57, 58, 78, 77], [58, 59, 79, 78], [59, 40, 60, 79], [60, 61, 81,
> 80], [61, 62, 82, 81], [62, 63, 83, 82], [63, 64, 84, 83], [64, 65, 85,
> 84], [65, 66, 86, 85], [66, 67, 87, 86], [67, 68, 88, 87], [68, 69, 89,
> 88], [69, 70, 90, 89], [70, 71, 91, 90], [71, 72, 92, 91], [72, 73, 93,
> 92], [73, 74, 94, 93], [74, 75, 95, 94], [75, 76, 96, 95], [76, 77, 97,
> 96], [77, 78, 98, 97], [78, 79, 99, 98], [79, 60, 80, 99], [80, 81, 82, 83,
> 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]], points =
> [[-12.1000000000, 0.6000000000, 2.4733413149], [-0.2645497289,
> -0.0128808879, 2.4733413149], [11.9344341747, -1.4086239445, 2.4733413149],
> [24.1355716448, -2.5542701643, 2.4733413149], [35.9774826150,
> -2.4168605418, 2.4733413149], [47.0987871087, 0.0365636260, 2.4733413149],
> [57.2529612666, 5.4496843894, 2.4733413149], [66.6402934955, 12.9518231698,
> 2.4733413149], [75.5697083075, 21.3041059427, 2.4733413149],
> [84.3501302148, 29.2676586838, 2.4733413149], [84.9947208658,
> 28.5062359773, 2.4733413149], [76.1429723223, 20.4779923324, 2.4733413149],
> [67.1410205492, 12.0578608568, 2.4733413149], [57.6774315256, 4.4947794099,
> 2.4733413149], [47.4407712304, -0.9623141489, 2.4733413149],
> [36.2291242397, -3.4356683946, 2.4733413149], [24.2910170177,
> -3.5741942466, 2.4733413149], [11.9907651653, -2.4192415160, 2.4733413149],
> [-0.3073156265, -1.0121603189, 2.4733413149], [-12.2389096666,
> -0.3943007714, 2.4733413149], [-12.1000000000, 0.1270378309, 7.4767584377],
> [-0.2645497289, -0.4858430570, 7.4767584377], [11.9344341747,
> -1.8815861136, 7.4767584377], [24.1355716448, -3.0272323334, 7.4767584377],
> [35.9774826150, -2.8898227109, 7.4767584377], [47.0987871087,
> -0.4363985431, 7.4767584377], [57.2529612666, 4.9767222203, 7.4767584377],
> [66.6402934955, 12.4788610007, 7.4767584377], [75.5697083075,
> 20.8311437736, 7.4767584377], [84.3501302148, 28.7946965147, 7.4767584377],
> [84.9947208658, 28.0332738082, 7.4767584377], [78.3312410826,
> 16.8515815611, 7.4767584377], [69.1485014005, 8.0008857770, 7.4767584377],
> [59.2936304543, 0.3859526016, 7.4767584377], [48.7084326467, -5.1379008975,
> 7.4767584377], [37.1619054951, -7.6851316458, 7.4767584377],
> [24.8828856821, -7.9305856419, 7.4767584377], [12.2166035420,
> -6.9439029250, 7.4767584377], [-0.4705620106, -5.2995812809, 7.4767584377],
> [-12.2389096666, -0.8672629405, 7.4767584377], [-12.1000000000,
> -0.0308238948, 12.5000000000], [-0.2645497289, -0.6437047827,
> 12.5000000000], [11.9344341747, -2.0394478393, 12.5000000000],
> [24.1355716448, -3.1850940591, 12.5000000000], [35.9774826150,
> -3.0476844366, 12.5000000000], [47.0987871087, -0.5942602689,
> 12.5000000000], [57.2529612666, 4.8188604946, 12.5000000000],
> [66.6402934955, 12.3209992750, 12.5000000000], [75.5697083075,
> 20.6732820479, 12.5000000000], [84.3501302148, 28.6368347890,
> 12.5000000000], [84.9947208658, 27.8754120825, 12.5000000000],
> [78.9262963850, 15.8362034527, 12.5000000000], [69.6943950981,
> 6.8684244385, 12.5000000000], [59.7331229699, -0.7606087627,
> 12.5000000000], [49.0531474556, -6.3026162734, 12.5000000000],
> [37.4155564369, -8.8699362381, 12.5000000000], [25.0438323598,
> -9.1444671741, 12.5000000000], [12.2780157076, -8.2035420741,
> 12.5000000000], [-0.5149535534, -6.4947077026, 12.5000000000],
> [-12.2389096666, -1.0251246662, 12.5000000000], [-12.1000000000,
> 0.1270378309, 17.5232415623], [-0.2645497289, -0.4858430570,
> 17.5232415623], [11.9344341747, -1.8815861136, 17.5232415623],
> [24.1355716448, -3.0272323334, 17.5232415623], [35.9774826150,
> -2.8898227109, 17.5232415623], [47.0987871087, -0.4363985431,
> 17.5232415623], [57.2529612666, 4.9767222203, 17.5232415623],
> [66.6402934955, 12.4788610007, 17.5232415623], [75.5697083075,
> 20.8311437736, 17.5232415623], [84.3501302148, 28.7946965147,
> 17.5232415623], [84.9947208658, 28.0332738082, 17.5232415623],
> [78.7634496000, 16.2287388054, 17.5232415623], [69.5450022043,
> 7.2930015653, 17.5232415623], [59.6128485300, -0.3321729292,
> 17.5232415623], [48.9588105122, -5.8692122925, 17.5232415623],
> [37.3461406360, -8.4310345089, 17.5232415623], [24.9997866233,
> -8.6976080565, 17.5232415623], [12.2612092466, -7.7441606233,
> 17.5232415623], [-0.5028050691, -6.0529812331, 17.5232415623],
> [-12.2389096666, -0.8672629405, 17.5232415623], [-12.1000000000,
> 0.6000000000, 22.5266586851], [-0.2645497289, -0.0128808879,
> 22.5266586851], [11.9344341747, -1.4086239445, 22.5266586851],
> [24.1355716448, -2.5542701643, 22.5266586851], [35.9774826150,
> -2.4168605418, 22.5266586851], [47.0987871087, 0.0365636260,
> 22.5266586851], [57.2529612666, 5.4496843894, 22.5266586851],
> [66.6402934955, 12.9518231698, 22.5266586851], [75.5697083075,
> 21.3041059427, 22.5266586851], [84.3501302148, 29.2676586838,
> 22.5266586851], [84.9947208658, 28.5062359773, 22.5266586851],
> [77.4852411417, 18.5436889190, 22.5266586851], [68.3723953242,
> 9.8594522949, 22.5266586851], [58.6687966940, 2.2645653588, 22.5266586851],
> [48.2183459157, -3.2334782825, 22.5266586851], [36.8012857663,
> -5.7521478605, 22.5266586851], [24.6540651349, -5.9562626915,
> 22.5266586851], [12.1292928529, -4.9045256155, 22.5266586851],
> [-0.4074498217, -3.3519227802, 22.5266586851], [-12.2389096666,
> -0.3943007714, 22.5266586851]]);
>     translate(v = [5.0, 123.0, 12.5]) {
>         rotate(a = 90, v = [103.5000000000, 69.1691761052]) {
>             cylinder(d = 10, h = 127.185440606789);
>         }
>     }
> }
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