On Fri, Jul 19, 2013 at 10:07 AM, Christopher Sean Morrison
<[email protected]>wrote:
>
> On Jul 19, 2013, at 7:32 AM, Clifford Yapp wrote:
>
> > Excellent picture, that helps a lot - yes, I think we agree, as long as
> that other paper's assertion that once we're down to Bezier patches we
> won't have any "patch internal" shared sub-surface intersection activity
> without involving the edges proves to be correct.
>
> It's a shame we have to use Bezier patches at all. I wonder if sorting
> through the surface tree to find overlapping subregions would be faster
> (since it's work we already had to do, yes?) than the work to decompose
> into Bezier patches and back. It'd be sampled, but should be no worse than
> our ray tracing.
>
As I understand it, the plan is not to explicitly convert to Bezier patches
- the idea is that if we use the isocurves defined by the knots we'll have
a grid in UV space, and the "patches" within the knots should have
Bezier-like behavior - the intersection test then reduces to isocurves vs.
surfaces, without (hopefully) needing to get the explicit Bezier patches.
Wu, did I say that correctly?
CY
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