Follow Me - Not consistantly make smooth curves

Developers Ruby API
1

I am creating a Ruby scrip to draw courses of a wall with a curve. The first three courses I draw with the follow me command works fine but after three courses they start to add extra faces on the curve.

Here is the script.

def draw_MyProject
model = Sketchup.active_model
entities = model.entities

layers = Sketchup.active_model.layers
layer = layers.add(“Spline”)

model.active_layer = layer

Draw the block - face

pts =
pts[0] = [437.3802, 347.0009, -38.75]
pts[1] = [437.6738, 350.8442, -38.75]
pts[2] = [437.7358, 351.6564, -31]
pts[3] = [437.3182, 346.1888, -31]
face = entities.add_face(pts)
connected = face.all_connected

Draw the block - face

pts =
pts[0] = [437.3182, 346.1888, -31]
pts[1] = [437.7358, 351.6564, -31]
pts[2] = [437.7979, 352.4686, -23.25]
pts[3] = [437.2561, 345.3766, -23.25]
face = entities.add_face(pts)
connected = face.all_connected

Draw the block - face

pts =
pts[0] = [437.2561, 345.3766, -23.25]
pts[1] = [437.7979, 352.4686, -23.25]
pts[2] = [437.8599, 353.2808, -15.5]
pts[3] = [437.1941, 344.5644, -15.5]
face = entities.add_face(pts)
connected = face.all_connected

Draw the block - face

pts =
pts[0] = [207.8086, 211.2927, -15.5]
pts[1] = [202.4888, 218.2295, -15.5]
pts[2] = [201.9931, 218.8758, -7.75]
pts[3] = [208.3043, 210.6464, -7.75]
face = entities.add_face(pts)
connected = face.all_connected

ptsSpine =
ptsSpine[0] = [208.8, 210, 0]
ptsSpine[1] = [347.28, 316.2, 0]

ptsSpine[2] = [347.28, 316.2, 0]
ptsSpine[3] = [352.5566, 320.0915, 0]
ptsSpine[4] = [358.0441, 323.6812, 0]
ptsSpine[5] = [363.7041, 326.9922, 0]
ptsSpine[6] = [369.5225, 330.0162, 0]
ptsSpine[7] = [375.4848, 332.7456, 0]
ptsSpine[8] = [381.576, 335.1736, 0]
ptsSpine[9] = [387.781, 337.2941, 0]
ptsSpine[10] = [394.0843, 339.1018, 0]
ptsSpine[11] = [400.4699, 340.5923, 0]
ptsSpine[12] = [406.9221, 341.7617, 0]
ptsSpine[13] = [413.4247, 342.6072, 0]
ptsSpine[14] = [419.9614, 343.1267, 0]
ptsSpine[15] = [426.5159, 343.3188, 0]
ptsSpine[16] = [433.0718, 343.1831, 0]
ptsSpine[17] = [437.07, 342.94, 0]

curve = entities.add_curve(ptsSpine)
status = face.followme(curve)

Draw the block - face

pts =
pts[0] = [208.3043, 210.6464, -7.75]
pts[1] = [201.9931, 218.8758, -7.75]
pts[2] = [201.4974, 219.5222, 0]
pts[3] = [208.8, 210, 0]
face = entities.add_face(pts)
connected = face.all_connected

ptsSpine =
ptsSpine[0] = [208.8, 210, 0]
ptsSpine[1] = [347.28, 316.2, 0]

ptsSpine[2] = [347.28, 316.2, 0]
ptsSpine[3] = [352.5566, 320.0915, 0]
ptsSpine[4] = [358.0441, 323.6812, 0]
ptsSpine[5] = [363.7041, 326.9922, 0]
ptsSpine[6] = [369.5225, 330.0162, 0]
ptsSpine[7] = [375.4848, 332.7456, 0]
ptsSpine[8] = [381.576, 335.1736, 0]
ptsSpine[9] = [387.781, 337.2941, 0]
ptsSpine[10] = [394.0843, 339.1018, 0]
ptsSpine[11] = [400.4699, 340.5923, 0]
ptsSpine[12] = [406.9221, 341.7617, 0]
ptsSpine[13] = [413.4247, 342.6072, 0]
ptsSpine[14] = [419.9614, 343.1267, 0]
ptsSpine[15] = [426.5159, 343.3188, 0]
ptsSpine[16] = [433.0718, 343.1831, 0]
ptsSpine[17] = [437.07, 342.94, 0]

curve = entities.add_curve(ptsSpine)
status = face.followme(curve)

Draw the block - face

pts =
pts[0] = [208.8, 210, 0]
pts[1] = [201.4974, 219.5222, 0]
pts[2] = [201.0017, 220.1686, 7.75]
pts[3] = [208.3043, 210.6464, 7.75]
face = entities.add_face(pts)
connected = face.all_connected

ptsSpine =
ptsSpine[0] = [208.8, 210, 0]
ptsSpine[1] = [347.28, 316.2, 0]

ptsSpine[2] = [347.28, 316.2, 0]
ptsSpine[3] = [352.5566, 320.0915, 0]
ptsSpine[4] = [358.0441, 323.6812, 0]
ptsSpine[5] = [363.7041, 326.9922, 0]
ptsSpine[6] = [369.5225, 330.0162, 0]
ptsSpine[7] = [375.4848, 332.7456, 0]
ptsSpine[8] = [381.576, 335.1736, 0]
ptsSpine[9] = [387.781, 337.2941, 0]
ptsSpine[10] = [394.0843, 339.1018, 0]
ptsSpine[11] = [400.4699, 340.5923, 0]
ptsSpine[12] = [406.9221, 341.7617, 0]
ptsSpine[13] = [413.4247, 342.6072, 0]
ptsSpine[14] = [419.9614, 343.1267, 0]
ptsSpine[15] = [426.5159, 343.3188, 0]
ptsSpine[16] = [433.0718, 343.1831, 0]
ptsSpine[17] = [437.07, 342.94, 0]

curve = entities.add_curve(ptsSpine)
status = face.followme(curve)

Draw the block - face

pts =
pts[0] = [208.3043, 210.6464, 7.75]
pts[1] = [201.0017, 220.1686, 7.75]
pts[2] = [200.506, 220.8149, 15.5]
pts[3] = [207.8086, 211.2927, 15.5]
face = entities.add_face(pts)
connected = face.all_connected

ptsSpine =
ptsSpine[0] = [208.8, 210, 0]
ptsSpine[1] = [347.28, 316.2, 0]

ptsSpine[2] = [347.28, 316.2, 0]
ptsSpine[3] = [352.5566, 320.0915, 0]
ptsSpine[4] = [358.0441, 323.6812, 0]
ptsSpine[5] = [363.7041, 326.9922, 0]
ptsSpine[6] = [369.5225, 330.0162, 0]
ptsSpine[7] = [375.4848, 332.7456, 0]
ptsSpine[8] = [381.576, 335.1736, 0]
ptsSpine[9] = [387.781, 337.2941, 0]
ptsSpine[10] = [394.0843, 339.1018, 0]
ptsSpine[11] = [400.4699, 340.5923, 0]
ptsSpine[12] = [406.9221, 341.7617, 0]
ptsSpine[13] = [413.4247, 342.6072, 0]
ptsSpine[14] = [419.9614, 343.1267, 0]
ptsSpine[15] = [426.5159, 343.3188, 0]
ptsSpine[16] = [433.0718, 343.1831, 0]
ptsSpine[17] = [437.07, 342.94, 0]

curve = entities.add_curve(ptsSpine)
status = face.followme(curve)

Draw the block - face

pts =
pts[0] = [207.8086, 211.2927, 15.5]
pts[1] = [200.506, 220.8149, 15.5]
pts[2] = [200.0103, 221.4613, 23.25]
pts[3] = [207.3129, 211.9391, 23.25]
face = entities.add_face(pts)
connected = face.all_connected

ptsSpine =
ptsSpine[0] = [208.8, 210, 0]
ptsSpine[1] = [347.28, 316.2, 0]

ptsSpine[2] = [347.28, 316.2, 0]
ptsSpine[3] = [352.5566, 320.0915, 0]
ptsSpine[4] = [358.0441, 323.6812, 0]
ptsSpine[5] = [363.7041, 326.9922, 0]
ptsSpine[6] = [369.5225, 330.0162, 0]
ptsSpine[7] = [375.4848, 332.7456, 0]
ptsSpine[8] = [381.576, 335.1736, 0]
ptsSpine[9] = [387.781, 337.2941, 0]
ptsSpine[10] = [394.0843, 339.1018, 0]
ptsSpine[11] = [400.4699, 340.5923, 0]
ptsSpine[12] = [406.9221, 341.7617, 0]
ptsSpine[13] = [413.4247, 342.6072, 0]
ptsSpine[14] = [419.9614, 343.1267, 0]
ptsSpine[15] = [426.5159, 343.3188, 0]
ptsSpine[16] = [433.0718, 343.1831, 0]
ptsSpine[17] = [437.07, 342.94, 0]

curve = entities.add_curve(ptsSpine)
status = face.followme(curve)

Draw the block - face

pts =
pts[0] = [437.2561, 345.3766, 23.25]
pts[1] = [438.1701, 357.3417, 23.25]
pts[2] = [438.2322, 358.1539, 31]
pts[3] = [437.3182, 346.1888, 31]
face = entities.add_face(pts)
connected = face.all_connected

Draw the block - face

pts =
pts[0] = [437.3182, 346.1888, 31]
pts[1] = [438.2322, 358.1539, 31]
pts[2] = [438.2942, 358.9661, 38.75]
pts[3] = [437.3802, 347.0009, 38.75]
face = entities.add_face(pts)
connected = face.all_connected

Draw the block - face

pts =
pts[0] = [437.3802, 347.0009, 38.75]
pts[1] = [438.2942, 358.9661, 38.75]
pts[2] = [438.3563, 359.7783, 46.5]
pts[3] = [437.4423, 347.8132, 46.5]
face = entities.add_face(pts)
connected = face.all_connected

Draw the spline - arc

ptsSpine =
ptsSpine[0] = [437.07, 342.94, 0]
ptsSpine[1] = [443.5937, 342.2763, 0]
ptsSpine[2] = [450.0761, 341.2883, 0]
ptsSpine[3] = [456.5011, 339.9776, 0]
ptsSpine[4] = [462.8526, 338.3474, 0]
ptsSpine[5] = [469.1146, 336.4019, 0]
ptsSpine[6] = [475.2716, 334.1457, 0]
ptsSpine[7] = [481.3081, 331.5847, 0]
ptsSpine[8] = [487.2091, 328.7252, 0]
ptsSpine[9] = [492.9597, 325.5743, 0]
ptsSpine[10] = [498.5458, 322.14, 0]
ptsSpine[11] = [503.9532, 318.4307, 0]
ptsSpine[12] = [509.1684, 314.4558, 0]
ptsSpine[13] = [514.1785, 310.2253, 0]
ptsSpine[14] = [518.9709, 305.7496, 0]
ptsSpine[15] = [521.76, 303, 0]

Draw the spline - arc

ptsSpine[16] = [521.76, 303, 0]
ptsSpine[17] = [526.7491, 298.0459, 0]
ptsSpine[18] = [531.9872, 293.3553, 0]
ptsSpine[19] = [537.4531, 288.9324, 0]
ptsSpine[20] = [543.1333, 284.7882, 0]
ptsSpine[21] = [549.0135, 280.933, 0]
ptsSpine[22] = [555.079, 277.3766, 0]
ptsSpine[23] = [561.3147, 274.1278, 0]
ptsSpine[24] = [567.705, 271.1947, 0]
ptsSpine[25] = [574.2339, 268.5846, 0]
ptsSpine[26] = [580.885, 266.3041, 0]
ptsSpine[27] = [587.6418, 264.3589, 0]
ptsSpine[28] = [594.4875, 262.7538, 0]
ptsSpine[29] = [601.4047, 261.4928, 0]
ptsSpine[30] = [607.69, 260.65, 0]

model.entities.add_curve(ptsSpine)

Draw the spline - arc

ptsSpine =
ptsSpine[0] = [607.69, 260.65, 0]
ptsSpine[1] = [614.6962, 260.0549, 0]
ptsSpine[2] = [621.7231, 259.8073, 0]
ptsSpine[3] = [628.7535, 259.9113, 0]
ptsSpine[4] = [635.7701, 260.3665, 0]
ptsSpine[5] = [642.7551, 261.1718, 0]
ptsSpine[6] = [649.6911, 262.3252, 0]
ptsSpine[7] = [656.5608, 263.8238, 0]
ptsSpine[8] = [663.347, 265.6638, 0]
ptsSpine[9] = [670.0328, 267.8408, 0]
ptsSpine[10] = [676.6014, 270.3492, 0]
ptsSpine[11] = [683.0365, 273.1827, 0]
ptsSpine[12] = [689.3218, 276.3344, 0]
ptsSpine[13] = [695.4419, 279.7962, 0]
ptsSpine[14] = [700.8, 283.2, 0]

Draw the spline - line

ptsSpine[15] = [700.8, 283.2, 0]
ptsSpine[16] = [917.4, 426.6, 0]

model.entities.add_curve(ptsSpine)

end

This is what it looks like.

2560×1600 152 KB

How do I get it to draw the curves smooth like the first three courses?

JeffG

2

SketchUp has an internal tolerance of 0.001" for point positions.
Although arrays of numerics can be passed as points to many API methods, they really are not point objects. Some API methods that create geometry, work much better if you convert the argument to a point.

Basically, your 5 position decimals may be boiling down to co-incident points on the inside of the curves ?

ptsSpine = []
ptsSpine[0] = Geom::Point3d::new( 607.69, 260.65, 0 )

Specifying exact indexes can get tedious. I’d just use Array#<< (append) myself:

ptsSpine = []
ptsSpine << Geom::Point3d::new( 607.69, 260.65, 0 )

There is a “small faces problem” within SketchUp. This might be the cause of what we see, but without zooming way in, it is impossible to tell. (Do a forum search and you’ll find many topics.) But basically you scale up before the operation, then scale back down afterward.
And you did not attach a SKP file as the result to the OP.