"Specified cast is not valid" Error

@max.wwwang wrote:

Hi there,

In testing some tutorial code, I got an error message and did not find the cause. Appreciate any hints.

The error was with the line-

rs.AddCurve(newverts, 5)

--Max

Code:

import rhinoscriptsyntax as rs

def blendcorners():
	polyline_id = rs.GetObject("Polyline to blend", 4, True, True)
	if not polyline_id: return
	vertices = rs.PolylineVertices(polyline_id)
	if not vertices: return
	radius = rs.GetReal("Blend radius", 1.0, 0.0)
	if radius is None: return
	between = lambda a,b: (a+b)/2.0
	newverts = []
	for i in range(len(vertices)-1):
		a = vertices[i]
		b = vertices[i+1]
		segmentlength = rs.Distance(a, b)
		vec_segment = rs.PointSubtract(b, a)
		vec_segment = rs.VectorUnitize(vec_segment)
		if radius<(0.5*segmentlength):
			vec_segment = rs.VectorScale(vec_segment, radius)
		else:
			vec_segment = rs.VectorScale(vec_segment, 0.5*segmentlength)
		w1 = rs.VectorAdd(a, vec_segment)
		w2 = rs.VectorSubtract(b, vec_segment)
		newverts.append(a)
		newverts.append(between(a,w1))
		newverts.append(w1)
		newverts.append(between(w1,w2))
		newverts.append(w2)
		newverts.append(between(w2,b))

	newverts.append(vertices[len(vertices)-1])
	rs.AddCurve(newverts, 5)
	print(newverts)
	rs.DeleteObject(polyline_id)

if __name__ == "__main__":
    blendcorners()

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