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I'm trying to scale an object in the X and Y direction and still keep the same shape. My main issue is that, when i scale my object in the desired directions, then the distance between my walls are also increasing.

I feel that i've tried a billion different methods but i just cant figure it out.

Here's pictures of what im trying to do: Basically, i'm trying to keep the walls at a constant thickness, in this case 2mm

Here is the original model - Diameter is 50mm and wall thickness is 2mm: Original model before scaling

Here is what i would like my model to look like after the scaling: Diameter 60mm and wall thickness 2mm Model after scaling

This is what happens - the walls are thicker than before: Diameter 60mm and wall thickness 2.4mm. This is what happens - the walls are thicker than before

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  • $\begingroup$ If you do not use a Solidify modifier to create the inner walls with the given distance, it is simply not possible by scaling - scaling is multiplying by a factor (with a factor > 1 scaling upwards and < 1 downwards), so everything you scale will be mutliplied by this factor, even the gap between walls. There is no simple tool to automatically maintain the distance from before scaling (apart from the Solidify modifier), you simply have to calculate different scaling factors for the outer and the inner part. But that's mathematics, not really a Blender issue. $\endgroup$ Oct 1, 2023 at 14:32
  • $\begingroup$ Thanks for taking the time to comment. I'm well aware that its not a blender issue. My question is about how one would tackle this challenge. My guess is, that you would take each vertex and get the distance to the center of the object in an horizontal line - then from there you could somehow add to that. Maybe something with the Normal direction. But i cant connect the dots to get it done.... $\endgroup$
    – GrooveDK
    Oct 1, 2023 at 15:13
  • $\begingroup$ Well, I didn't look at the tags, in your question itself there was no hint that you are talking about Geometry Nodes, sorry for my misunderstanding. $\endgroup$ Oct 1, 2023 at 15:35
  • $\begingroup$ Sorry i didnt make that more clear. But thanks anyway $\endgroup$
    – GrooveDK
    Oct 1, 2023 at 18:57

1 Answer 1

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As @Gordon says in the commentary, Scaling is a multiplication, and you want an addition.

One way, if you want to use Geometry Nodes, would be to offset the vertices by some multiple of their XY Position, normalized to unit length, (thus extracting only their direction, in XY, from the object-origin):

enter image description here

For this result:

enter image description here

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  • $\begingroup$ After doing a quick test in my setup, it seems to do exactly what i was searching for. Thank you very much! My former attempts were very much overcomplicated :D Again Thanks! $\endgroup$
    – GrooveDK
    Oct 1, 2023 at 19:02

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