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Blender
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Modified 1 month ago
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I have some code that generates a curve:

import bpy

curve_data = bpy.data.curves.new("SimpleCurve", type='CURVE')
spline = curve_data.splines.new(type='POLY')
spline.points.add(3)
coords = [(0, 0, 0, 1),  (1, 0, 0, 1),  (1, 1, 1, 1), (0, 1, 1, 1)]

for i, co in enumerate(coords):
    spline.points[i].co = co

curve_obj = bpy.data.objects.new("SimpleCurve", curve_data)
bpy.context.collection.objects.link(curve_obj)

This works fine, but when I edit the generated curve, dragging any point causes all points to reset their Z values to zero. What am I doing wrong?

demonstration

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1 Answer 1

Reset to default
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In the generated curve's Object Data Properties > Shape panel, you'll notice it's set to 2D but you need 3D.

enter image description here

By default, Blender generates a 2D curve that is always flattened onto the object's local XY plane, meaning all Z coordinates are set to $0$. If you want the curve to retain depth or exist in 3D space, you need to set its dimensions to '3D'.

curve_data = bpy.data.curves.new("SimpleCurve", type='CURVE')
curve_data.dimensions = '3D'  # add this line
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