# Follow Me - Not consistantly make smooth curves

**URL:** <https://forums.sketchup.com/t/follow-me-not-consistantly-make-smooth-curves/21810>\
**Category:** Ruby API\
**Created:** [March 10, 2016, 10:46pm UTC](https://forums.sketchup.com/t/follow-me-not-consistantly-make-smooth-curves/21810 "2016-03-10T22:46:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![JeffG](https://avatars.discourse-cdn.com/v4/letter/j/53a042/32.png) [@JeffG](https://forums.sketchup.com/u/JeffG)\
**Post date:** [March 10, 2016, 10:46pm UTC](https://forums.sketchup.com/t/follow-me-not-consistantly-make-smooth-curves/21810/1 "2016-03-10T22:46:36Z")

</div>

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.

 ![](https://global.discourse-cdn.com/sketchup/original/2X/1/1b94150b9a25a2c9a4b403c6bf1783363f914229.png)

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

JeffG

---

<div class="post-metadata">

**Author:** ![DanRathbun](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/danrathbun/32/500_2.png) [@DanRathbun](https://forums.sketchup.com/u/DanRathbun)\
**Post date:** [March 11, 2016, 8:55pm UTC](https://forums.sketchup.com/t/follow-me-not-consistantly-make-smooth-curves/21810/2 "2016-03-11T20:55:44Z")

</div>

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 ?

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

```

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

```ruby
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.