Explaining the Scratch Off algorithm of the Hatching brush

[Adam C.]

On Sat, 19 Jun 2010 18:10:26 +0200, LukasT.dev at gmail.com  
<lukast.dev at gmail.com> wrote:

> On Saturday, June 19, 2010 17:44:54 JL VT wrote:
>> My original aim with the brush was giving artists a tool to make
>> boring(tm), very regular hatching directly with a tool instead of having
>> to use time-consuming filters. With time I've been thinking of also
>> allowing the user to do a more "organic" hatching too (
>> http://bmia.bmt.tue.nl/Research/MVIAV/IVR/ivrsb/index.php?Page=Hatching  
>> ;
>> check the middle skull), but that would take long, I'd surely have to
>> sacrifice not finishing a halftone brush to work on that. I think it's
>> worth the attempt though.
>
> The pictures you sent are from Volume rendering, which means that the  
> hatching
> is based on 3D information. That's why it looks so cool. I'm not sure  
> how do
> you want to reach that effects?

Just an idea:
Use the pressure sensitivity,
on low pressure, hatch a big area with few lines,
on high pressure, hatch a small area with many lines.

Also the "direction history" could be taken into account. if making a long  
curve, it is a sharp edge, if making many turns, it would be an area.

I don't know, if it would be usable, how much time it would take to  
develop and if it's feasible for gsoc.


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