Merge pull request #1304 from compas-dev/fix-bug-curve-degree

Fix bug related to value of degree in Nurbs Curves

CHANGELOG.md

@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Changed `compas.datastructures.TreeNode` to skip serialising `attributes`, `name` and `children` if being empty.
 * Changed `compas.datastructures.TreeNode.__repr__` to omit `name` if `None`.
+* Fix bug in `compas_rhino.geometry.NurbsCurve.from_parameters` and `compas_rhino.geometry.NurbsCurve.from_points` related to the value of the parameter `degree`.
 * Changed `compas.scene.descriptors.ColorDictAttribute` to accept a `compas.colors.ColorDict` as value.
 * Changed `compas_rhino.scene.RhinoMeshObject.draw` to preprocess vertex and face color dicts into lists.
 * Changed `compas_rhino.conversions.vertices_and_faces_to_rhino` to handle vertex color information correctly.

src/compas_rhino/geometry/curves/nurbs.py

@@ -187,6 +187,7 @@ def from_parameters(cls, points, weights, knots, multiplicities, degree, is_peri
 
         """
         curve = cls()
+        degree = min(degree, len(points) - 1)
         curve.rhino_curve = rhino_curve_from_parameters(points, weights, knots, multiplicities, degree)
         return curve
 
@@ -208,9 +209,10 @@ def from_points(cls, points, degree=3, is_periodic=False):
         :class:`compas_rhino.geometry.RhinoNurbsCurve`
 
         """
-        points[:] = [point_to_rhino(point) for point in points]
         curve = cls()
-        curve.rhino_curve = Rhino.Geometry.NurbsCurve.Create(is_periodic, degree, points)
+        degree = min(degree, len(points) - 1)
+        rhino_curve = Rhino.Geometry.NurbsCurve.Create(is_periodic, degree, [point_to_rhino(point) for point in points])
+        curve.rhino_curve = rhino_curve
         return curve
 
     @classmethod