RE: [LIBART] problem with art_rgb_svp_alpha()

["Jason Priebe" <priebe mi-corporation com>]

> > I was also getting a lot of colinear warnings.  A _lot_ of
> > our handwritten data is colinear, due to the low sampling
> > resolution of some of our input devices.
> 
> In this case, wouldn't it be more effecient to preprocess the
> input data? i.e. filter that get rid of unnecessary control
> points (like aligned points).

We _do_ preprocess to remove sequential points with the
same x,y values.  But we don't check for colinearity.

I'm not sure what about our data sets is causing problems
for libart.  Is it because three sequential points are colinear?
Like this?

           x----x----x
          /
         x

All I get are these "colinear!" warnings that don't really help
from a diagnostic standpoint; I can't really tell which points
are the offenders.

Jason Priebe
Mi-Co
http://www.mi-corporation.com/ 

> 
> > I decided to write my own vpath_perturb() function, which
> > uses a larger perturbation value (2e-2 instead of 2e-3),
> > and all of my problems seem to have gone away!
>

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