Scale multiple surfaces from their own origin

[bhall]

Hi guys,

I want to scale multiple surfaces by 0.9, like in this picture:

The problem is that I dont know how to do this in Dynamo.
Could anyone help?

Thanks in advance!

[christian.stan]

Hello,

Here’s how you can do it (there are always several potential solutions)

The assumption is that you already have your surfaces in a list.

1/ Add volume to your surface (Surface.Thicken node)
2/ Get the centroids of the solids (Node Solid.centroid)
3/ Create a marker on these said nodes (Node CoordinateSystem.ByOrigin)
4/ Create 2 Points (x=1 and x=Math.Sqrt(0.9)) in these markers
(Node Point.ByCartesianCoordinate and Math.Sqrt)
5/ Create the transformation
(Node Geometry.Scale)
Geometry = Surface
Point of origin: centroid
from Point x=1
to Point x=Math.Sqrt(0.9)

edit:
I had forgotten that a surface is of dimension2 (correction of the message) @bhall
Cordially
christian.stan

[bhall]

Thanks for your sugestion. I will try!

[bhall]

I selected the nodes you sugested. How should I connect them to each other?

[christian.stan]

with this nodes it will be more practical

Cordially
christian.stan