Ships/Boats?

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On Fri, 23 May 2014 08:48:21 -0400
Ari Diacou <[hidden email]> wrote:

> The shape of hulls are so complicated that they aren't protected by patent
> - they are protected by copyright.

A lot of good representations of them can be produced by a mathematical
formula however, which nicely dodges the issue 8) or many of the
traditional designs which are out of even the USA's rather extreme
copyright nuttiness.

The thing to model though isn't the shape of the hull, at least for a
smaller traditional wooden boat. Model the spars and the internal
structure, the shape of the planking derives from that - it really is a
use of the "hull()" operator.

Alan
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Only if the exterior shape has no concave areas, though. It is a *convex* hull operator. So, for example, a pointy keel would not do what you would expect.

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On Fri, 23 May 2014 21:20:57 -0700 (PDT)
jsc <[hidden email]> wrote:

> Only if the exterior shape has no concave areas, though. It is a *convex*
> hull operator. So, for example, a pointy keel would not do what you would
> expect.

I didn't mean to imply it was literally equivalent to hull(), just a
'hull' operator.
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I'm very new to OpenSCAD and the forum. I have been watching this topic in the hope that it might shed some light for me. All I have got out of it is that boat hulls are not simple.

I have a trike


and want to make a velomobile shell over it, like this one.


I created a very basic outline of my trike in OpenSCAD


and added started playing with different shapes to add to the shell.


Apart from the pieces of ball (code below) I will need to use pieces of cylinders and probably a few other shapes.

//shell front top
translate ([-200,0,400])    // position
scale ([2,1,1])                // stretch x
rotate([0, 0, -90])           // rotate z
qtr_ball(380);                  // 380 outside radius



module qtr_ball(out_rad){
 difference(){
  half_ball(out_rad);

  translate([-out_rad-1,-out_rad-1,(-out_rad-1)*2])
  cube ([(out_rad+1)*2,(out_rad+1)*2,(out_rad+1)*2]);
 }
}

module half_ball(out_rad){
 difference(){
  ball(out_rad);

  translate([-out_rad-1,0,-out_rad-1])
  cube ([(out_rad+1)*2,out_rad+1,(out_rad+1)*2]);
 }
}

module ball(out_rad){
 difference(){
  sphere(out_rad, $fn=200);
  sphere(out_rad-5, $fn=50);
 }
}