Curve Path Length Question

Coding Python Support
1

Hi, The DOC here - https://docs.blender.org/api/current/bpy.types.Curve.html - says:

eval_time

Parametric position along the length of the curve that Objects ‘following’ it should be at >(position is evaluated by dividing by the ‘Path Length’ value)

So it is evaluating the evaltime by dividing by the ‘Path Length’ … Who and Where is getting the Path Length from?
I am desperatly in th need of the Path length for a script…

Any Clues?

2

Spline length perhaps?

image
image1366×768 147 KB

import bpy

OBJ = bpy.data.objects["NurbsPath"]

for s in OBJ.data.splines:
    print(s.calc_length())
3

Ok, this is something. However, I am under the Impression this is not incorperating the curvature of the path.
Might this be the case?

But thank so far, this is a huge step!

5

here is the code, it works.
Select a Path and run the script.
It will print the Path´s length in the console.

import bpy
import bmesh


context = bpy.context
baseObject = context.active_object
copy = bpy.ops.object.duplicate(linked=False)

bpy.ops.object.convert(target='MESH')
bpy.ops.object.mode_set(mode="EDIT")
bpy.ops.mesh.select_all(action='SELECT')

me = context.active_object.data
bm = bmesh.from_edit_mesh(me)

path_length = 0

for e in bm.edges:
    
    if e.select:
        
        path_length = path_length + e.calc_length()

print("length",path_length)

bpy.ops.object.editmode_toggle()
bpy.ops.object.delete()
bpy.context.view_layer.objects.active = baseObject
baseObject.select_set(True)