I have a geometry and I want to make it look thickened, in order to do that I cloned the buffer geometry and made its normal to move inwards all that’s left is to connect the edges of the 2 geoms to make them look thick.
Is there any better approach then this and if there is please let me know.
Since you have the wall points (geometry edges), you can convert them into a Shape. Then, use it with ExtrudeGeometry, which gives you built-in control over depth, bevel, and wall thickness. You can even use a SplineCurve to create smooth, rounded corners.
The only issue is the orientation of your initial geometry. Since Shape only works with Vector2s, you’ll need to first orient the geometry onto a 2D plane and ignore the z axis.
Hmmm, correct me if I am wrong. So what you are saying is make a shape using the x and y of the geometry edges convert them into shape and merge the 2 geometries?
You were obviously using face normals for this. Extruding faces of a concave (hollow) wall towards the inside gives you those “undercuts”, which is what self- intersecting equidistants are called. I would consider those undesireable.
Since you’re asking, You are probably not satisfied with the result. A imo better way would be to use vertex normals for scaling/extruding. That way you’d be getting the proper scaling regardless of inward or outward extrusion.
A vertex normal is computed by averaging the face normals of all faces which share this vertex.
If you can share the geometry external corners points, I’ll give it a shot 
One more thing, does the scan have a fixed orientation, is the geometry always generate on the same plane?
Yes, the geometry is actually being scanned using a 3d scanner and its orientation is always the same so I can rely on static axis transformations but scale is not the same.
Let me create a script to give the external corner points.
I am actually not extruding I am intruding it, the problem with extrusion is that it’s making the upper part of the geometry messed up. Which is causing issues while 3d printing. I did try your method but still getting self-intersecting vertices
Here are the geometry external points:
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The orientation seems fine, the points are already one a 2D plane you can safely remove the z axis. However, there’s an issue with the order of the points. You need to pick them in a circular, clockwise order. This is likely the cause of the entanglement or self-intersecting vertices problem.
Here is my attempt using the provided vertices: jsfiddle
I’ll try with some ordered vertices as an example and share the result here.
Here is an illustration of the curves idea, with arbitrary vertices arranged in a clockwise order. It’s not perfect, but it’s a solid starting point: jsfiddle.
The only remaining issue is to get the edge vertices in a clockwise order.
OH that’s what you were trying to say, thanks for the effort but actually this is not what I want. I know how to do that I wanted something like the solidify modifier of blender.
It just adds thickness to the geometry that’s it. But creating it from scratch is a little bit hard for me as I dont know how to connect the meshes.