[postgis-devel] ForceRHR doesn't?

[Michael Fuhr]

On Sat, Mar 11, 2006 at 09:49:04PM -0800, Paul Ramsey wrote:
> "Right hand rule" means "if I walk along the boundary of the polygon  
> with my right hand extended, it is always inside the polygon".  So  
> the external rings go clockwise, and the internal rings go anti- 
> clockwise.

Is there disagreement in the field on that or does the definition
vary depending on context?  I've found that definition as well as
the opposite; hence my confusion.  Maybe the documentation should
explain exactly what "Force polygons of the collection to obey
Right-Hand-Rule" means.

> And it looks like you found a silly bug, since ForceRHR should not be  
> calling an unconditional reverse.

That's the main point: ForceRHR doesn't seem to be doing what it
should be.

Thanks.

-- 
Michael Fuhr