[Therion] xtherion trace line, convert to curve

Thomas Holder thomas at thomas-holder.de
Thu Jun 7 21:15:39 CEST 2012


wow, that's a cool feature! I didn't know XTherion can do that.

It's true that Inkscape can't do line tracing. It has a "trace bitmap" 
feature (based on potrace) which does trace filled shapes, but this is 
pretty useless for tracing cave drawings.

Cheers,
   Thomas

Stacho Mudrak wrote, On 06/07/12 12:54:
> I am afraid, there are no instructions :(
> 
> I needed it to convert raster surface contours to vector data, to be 
> able to generate 3D model.
> 
> You need to load a background image. Then - on a raster line - add firt 
> two points of line, their distance defines tracing step. Like this:
> 
> Inline images 2
> 
> Then click continue tracing and this is the result.
> Inline images 3
> 
> You can then convert this line to bezier curve.
> 
> Inline images 4
> 
> HTH, S.
> 
> P.S. Ad Inkscape - I have been playing a lot with raster -> vector 
> features of Inkscape, but ended with programming my own digitalization 
> tool in xtherion. Inkscape was not designed to be used this way.
> 
> On 7 June 2012 02:42, Bruce <bruce at tomo.co.nz <mailto:bruce at tomo.co.nz>> 
> wrote:
> 
>     Are there any instructions regarding Xtherion’s ‘trace line’ and
>     ‘convert to curve’ line editing features?
> 
>     I expect there are – just cannot find them.
> 
>      
> 
>     The ‘convert to curve’ seems to take a line with straight segments
>     and converts it to a smooth curve, so perhaps not so complicated.
> 
>     I have not been able to get any useful insights after playing with
>     ‘trace line’, except that it adds two buttons to the interface.
> 
>     Thanks
> 
>     Bruce



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