[REQ] Reverse curve script

[thomthom]

You mean the order the edges appear? That start edge becomes end edge?
Or is it related to the shape of the curve?

[Pixero]

Reversing the vertices order.
I'm trying to animate using curves and some of them are reversed which makes the camera look backwards.
The secondary script is to put a construction point at the beginning of a curve for easy finding the reversed curves.
"Mark curve start point" or something like that.

[thomthom]

Here's some code snippets

curve = some_curve_object # fill in what you need


# Reverse points in a curve
points = curve.vertices.reverse.collect { |vertex| vertex.position }
# (!) You want to delete the curve from the model at this point. How you do this depends if you need to consider attached faces.
Sketchup.active_model.active_entities.add_curve(points)


# Construction point at start
Sketchup.active_model.active_entities.add_cpoint(curve.vertices[0].position)

[Pixero]

I've tried the construction point at start but that didnt work as expected. Sometimes puts it at first vertice but other times in the middle of a curve. Hmmmm.

Here is the code I used:

Sketchup.active_model.active_entities.add_cpoint(Sketchup.active_model.selection.vertices[0].position)

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BugExample.skp

[thomthom]

Oh.
I assumed that the vertices returned where in order. That means none of my examples works...
Maybe a sorting routine that starts with the starting edges and traverses the connected edges is required....

[thomthom]

Or maybe not.
That sample code line you used didn't work for me.

Error is here:
Sketchup.active_model.active_entities.add_cpoint(Sketchup.active_model.%(#FF8000)[**selection.vertices[0]**].position)

corrected version that appear to work:
Sketchup.active_model.active_entities.add_cpoint(Sketchup.active_model.selection[0].curve.vertices[0].position)

[Pixero]

Yes thanks that seem to work.
Now if only I can reverse them...

[thomthom]

My example doesn't work?

[thomthom]

# Get the Curve object from the selection
curve = Sketchup.active_model.selection[0].curve

# Reverse points in a curve
points = curve.vertices.reverse.collect { |vertex| vertex.position }
# Erase the original curve
curve.parent.entities.erase_entities(curve.edges)
# Rebuild it
Sketchup.active_model.active_entities.add_curve(points)

[Pixero]

Thanks, it works fine now.
I have attached the script if anyone else needs it.
Now off to fix those troublesome animation curves...

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reverseCurve.rb