Finding the widest part of an imported svg

Hi,

Up until today I have usually found ways to do what I want with OpenSCAD, but now I have an idea with more 'organic' inputs and I'm stumped.

Basically, I want to make a 3d-printable knife sheath. The idea is that you provide an svg with the outline of the knife (easily made by photographing the knife with a reference distance drawn on some paper and then scaling and tracing the knife outline in Inkscape), and then my OpenSCAD model derives a suitable sheath from that svg. But when you have a knife that is wider in the middle than at the sides (i.e. knife has a bit of a 'belly'), then the 'entrance' of the sheath has to be as wide as the widest part of the knife, of course. (see https://imgur.com/a/YuG3eWi for a crude sketch of what I mean). Basically what I'm looking for is a way to find the widest part of a path that was imported with import() and then 'project' that to the side of my model (i.e., in the linked image, find the x-location of the widest part, indicated with the red line, and then project it to the right). The 'projection' part I can do by drawing a box but I need to know where to set its origin, i.e. the x-location of the red line.

I'm ok with some constraints, like assuming that the spine (top) of the knife is perfectly horizontal in the source svg, and that the tang (handle) is always at the right, so that the 'projection' is basically always along the positive x-axis.

Or maybe I'm barking up the wrong tree completely with my approach and there is a better way; I'm open to such a different approach too, of course.

Thanks.

cheers

Roel

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blade_thickness=3;
epsilon=1e-20;
blade();
translate([0,50])sheath();


module sheath() {
    
    hull(){
    blade();
     linear_extrude(epsilon) projection()blade() ;
}
    }



module blade()
{rotate([0,-90])
    linear_extrude(blade_thickness, center=true)
    blade_profile();
     
    }
module blade_profile(){
    //import your svg
    polygon([[0,0],[30,-5],[70,-20],[130,-15],[200,10],[130,7],[100,10],[0,10]]);
    
    }

---

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To unsubscribe send an email to [hidden email]

blade_thickness=3;
epsilon=1e-20;
blade();
translate([0,50])sheath();


module sheath() {
    
    hull(){
    blade();
     linear_extrude(epsilon) projection()blade() ;
}
    }



module blade()
{rotate([0,-90])
    linear_extrude(blade_thickness, center=true)
    blade_profile();
     
    }
module blade_profile(){
    //import your svg
    polygon([[0,0],[30,-5],[70,-20],[130,-15],[200,10],[130,7],[100,10],[0,10]]);
    
    }

---

Sent from the OpenSCAD mailing list archive at Nabble.com.
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