Try open this file, preview or render failed, what's wrong??

[jumbojing]

def thread(P=1, #螺距, length=2, #螺丝的总长, Rmaj=5, #外径, sn = 36):

angle = 360/sn

Pt = []

for i in range(sn):
    if i > round(sn / 2):
        i = i - round(sn / 2)
    r = Rmaj - i / sn * P
    p = [r * cos( i* angle), r * sin(i * angle)]

    Pt.append(p)

c = P2(Pt)
c = Le(height = length, convexity = 10, twist = -360.0*length/P, 
       center = True, slices = 500)(c)

c = Pr()(Ry(90)(thread())) scad_render_to_file(c,"testcc.scad")

Try to open the testcc.scad, but preview or render failed, what's wrong??

this is testcc.scad:

projection() { rotate(a = [0, 90, 0]) { linear_extrude(center = true, convexity = 10, height = 2, slices = 500, twist = -720.0000000000) { polygon(paths = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35]], points = [[5.0000000000, 0.0000000000], [-4.1720501029, -2.7049938569], [2.0177390834, 4.5140070730], [0.7584029619, -4.8578221518], [-3.2605860792, 3.6427754512], [4.6908070829, -1.2754333166], [-4.6033294053, -1.4732513353], [3.0434506148, 3.7189746642], [-0.5274057206, -4.7485791243], [-2.1283496766, 4.2464841521], [4.0720613414, -2.3911710830], [-4.6898477069, -0.2076947943], [3.7995111958, 2.7095188597], [-1.7038236718, -4.3146581578], [-0.9121403690, 4.5199939852], [3.2048995297, -3.2765169691], [-4.4445335361, 0.9996039548], [4.2470317943, 1.5695517013], [-2.6930703108, -3.6051868608], [-4.1720501029, -2.7049938569], [2.0177390834, 4.5140070730], [0.7584029619, -4.8578221518], [-3.2605860792, 3.6427754512], [4.6908070829, -1.2754333166], [-4.6033294053, -1.4732513353], [3.0434506148, 3.7189746642], [-0.5274057206, -4.7485791243], [-2.1283496766, 4.2464841521], [4.0720613414, -2.3911710830], [-4.6898477069, -0.2076947943], [3.7995111958, 2.7095188597], [-1.7038236718, -4.3146581578], [-0.9121403690, 4.5199939852], [3.2048995297, -3.2765169691], [-4.4445335361, 0.9996039548], [4.2470317943, 1.5695517013]]); } } }

[nickc92]

I think the main issue here is that you are trying to use degrees in the python sin() and cos() functions. OpenSCAD uses degrees everywhere, but the python math module trig functions use radians. Try changing the line angle = 360/sn to angle = 2 * pi / sn.

[jumbojing]

@nickc92 Great!Successful!thank you very much!! And another question, how to measure the point-to-point distance in openscad or solidpython, is there a good way?

[etjones]

SolidPython includes a vector math library, euclid3. If you work with Vector3s, Point3s, etc, you should be able to measure vector lengths with .magnitude()

Ex:

from euclid3 import Vector3
a = Vector3(1,0, 0)
b = Vector3(2,1,2)
c = a - b
print(d.magnitude())
>> 2.449489742783178

Good luck!

[jumbojing]

thanks,but i wanna snap (like autocad)special points, and then measure...

[etjones]

Sorry for the bad news, but that’s one of the hard limits of OpenSCAD; there’s no way to get input from the rendered geometry back to the program that generated it. You may have better luck with a more full-featured CAD program.

On Jun 15, 2019, at 11:04 PM, Jumbo Jing notifications@github.com wrote:

thanks,but i wanna snap (like autocad)special points, and then measure...

— You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

[nickc92]

Hi, when I tried your code, it looks like I got something which is 10 units high.  One thing to mention is that the grid squares are not always 1.0 in size.  It depends on the size of the rendered object.  I've pasted my render below, and at the bottom of the image, there is a square with "=2.0" written next to it.  This indicates that the square is 2.0 in size. -Nick

On 6/21/19 11:50 PM, Jumbo Jing wrote:

The python code:

|from solid import from solid.utils import import viewscad r = viewscad.Renderer() def thread(P=1, #螺距, length=10, #螺丝的总长, Rmaj=10, #外径, sn = 36): angle = 2 * pi/sn Po = [] for i in range(0,sn): j = i if i > round(sn / 2): j = sn - i r = Rmaj - j / sn

• P p = [r cos( i angle), r sin(i angle)] Po.append(p) Fa = polygon(Po) p3 = linear_extrude(height = length, convexity = 10, twist = -360.0*length/P, center = True)(Fa) print(scad_render(c)) # r.render(c) # print(Pt) return(p3) c = thread() # c = Le(.1)(Pr()(Ry(90)(c))) r.render(c) |

The scad code:

|linear_extrude(center = true, convexity = 10, height = 10, twist = -3600.0000000000) { polygon(paths = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35]], points = [[10.0000000000, 0.0000000000], [9.8207217592, 1.7316582162], [9.3447210623, 3.4012003142], [8.5880852542, 4.9583333333], [7.5753283820, 6.3564552513], [6.3386000400, 7.5540493696], [4.9166666667, 8.5159164705], [3.3536975165, 9.2142081983], [1.6978932927, 9.6292313628], [0.0000000000, 9.7500000000], [-1.6882461718, 9.5745198210], [-3.3156952784, 9.1097979071], [-4.8333333333, 8.3715789032], [-6.1957583489, 7.3838172712], [-7.3625382589, 6.1779031375], [-8.2994101196, 4.7916666667], [-8.9792850431, 3.2681924807], [-9.3830294245, 1.6544812483], [-9.5000000000, 0.0000000000], [-9.3830294245, -1.6544812483], [-8.9792850431, -3.2681924807], [-8.2994101196, -4.7916666667], [-7.3625382589, -6.1779031375], [-6.1957583489, -7.3838172712], [-4.8333333333, -8.3715789032], [-3.3156952784, -9.1097979071], [-1.6882461718, -9.5745198210], [-0.0000000000, -9.7500000000], [1.6978932927, -9.6292313628], [3.3536975165, -9.2142081983], [4.9166666667, -8.5159164705], [6.3386000400, -7.5540493696], [7.5753283820, -6.3564552513], [8.5880852542, -4.9583333333], [9.3447210623, -3.4012003142], [9.8207217592, -1.7316582162]]); } |

I use ViewSCAD to render a SolidPython object in Jupyter:

屏幕快照 2019-06-22 上午11 41 15 https://user-images.githubusercontent.com/10215735/59959060-b9aaa980-94e2-11e9-8e02-8f6ed3848e42.png

The height is about 5,why???

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[jumbojing]

Well, I have realized this, but thank you for your prompt answer.

Hi, when I tried your code, it looks like I got something which is 10 units high.  One thing to mention is that the grid squares are not always 1.0 in size.  It depends on the size of the rendered object.  I've pasted my render below, and at the bottom of the image, there is a square with "=2.0" written next to it.  This indicates that the square is 2.0 in size. -Nick … On 6/21/19 11:50 PM, Jumbo Jing wrote: The python code: |from solid import from solid.utils import import viewscad r = viewscad.Renderer() def thread(P=1, #螺距, length=10, #螺丝的总长, Rmaj=10, #外径, sn = 36): angle = 2 pi/sn Po = [] for i in range(0,sn): j = i if i > round(sn / 2): j = sn - i r = Rmaj - j / sn P p = [r cos( i angle), r sin(i angle)] Po.append(p) Fa = polygon(Po) p3 = linear_extrude(height = length, convexity = 10, twist = -360.0*length/P, center = True)(Fa) print(scad_render(c)) # r.render(c) # print(Pt) return(p3) c = thread() # c = Le(.1)(Pr()(Ry(90)(c))) r.render(c) | ------------------------------------------------------------------------ The scad code: |linear_extrude(center = true, convexity = 10, height = 10, twist = -3600.0000000000) { polygon(paths = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35]], points = [[10.0000000000, 0.0000000000], [9.8207217592, 1.7316582162], [9.3447210623, 3.4012003142], [8.5880852542, 4.9583333333], [7.5753283820, 6.3564552513], [6.3386000400, 7.5540493696], [4.9166666667, 8.5159164705], [3.3536975165, 9.2142081983], [1.6978932927, 9.6292313628], [0.0000000000, 9.7500000000], [-1.6882461718, 9.5745198210], [-3.3156952784, 9.1097979071], [-4.8333333333, 8.3715789032], [-6.1957583489, 7.3838172712], [-7.3625382589, 6.1779031375], [-8.2994101196, 4.7916666667], [-8.9792850431, 3.2681924807], [-9.3830294245, 1.6544812483], [-9.5000000000, 0.0000000000], [-9.3830294245, -1.6544812483], [-8.9792850431, -3.2681924807], [-8.2994101196, -4.7916666667], [-7.3625382589, -6.1779031375], [-6.1957583489, -7.3838172712], [-4.8333333333, -8.3715789032], [-3.3156952784, -9.1097979071], [-1.6882461718, -9.5745198210], [-0.0000000000, -9.7500000000], [1.6978932927, -9.6292313628], [3.3536975165, -9.2142081983], [4.9166666667, -8.5159164705], [6.3386000400, -7.5540493696], [7.5753283820, -6.3564552513], [8.5880852542, -4.9583333333], [9.3447210623, -3.4012003142], [9.8207217592, -1.7316582162]]); } | I use ViewSCAD to render a SolidPython object in Jupyter: 屏幕快照 2019-06-22 上午11 41 15 https://user-images.githubusercontent.com/10215735/59959060-b9aaa980-94e2-11e9-8e02-8f6ed3848e42.png The height is about 5,why??? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#112?email_source=notifications&email_token=ADMXOCCFHH47USHCZXV3VATP3WOPTA5CNFSM4HYMNJIKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODYJ7NVY#issuecomment-504624855>, or mute the thread https://github.com/notifications/unsubscribe-auth/ADMXOCGCWKIV2XB6SSIE573P3WOPTANCNFSM4HYMNJIA.