[REQ] Reverse curve script

Pixero

Could someone please write a script to reverse the direction of a selected curve?
Possibly a secondary script to put a construction point at the first point of a curve for finding reverse curves.
Please!

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)

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...

reverseCurve.rb