[x3d-public] x3dom nurbs support

[GPU Group]

Andreas
swept and swung are in The Nurbs Book (and not too hard - a 2D curve, then
extrude that curve in a few different ways. Swept: along an arbitrary 3D
curve,could be a curbs curve. Swung: around some line/axis lying in the
plane of the curve)
-Doug


On Sat, Sep 29, 2018 at 10:34 AM Andreas Plesch <andreasplesch at gmail.com>
wrote:

> Based on the initial Ayam x3dom Nurbs node support for PatchSurface
> and TrimmedSurface, I am working on more complete and animation
> capable Nurbs component implementation in my x3dom NURBS branch.
>
> Here are examples of working nodes:
>
>
> https://rawgit.com/andreasplesch/x3dom/Nurbs/test/functional/nurbs/inline.html
>
> I added NurbsCurve and the interpolators. In addition, the web worker
> code can now be bundled, and is optimized to support animation of
> control points and weights which do not require retriangulation. This
> makes the AnimatedNurbsPatchSurfaceHead example borderline ok to
> animate on a regular desktop but also shows the limits off CPU (via
> js) only animation although there is additional room for further
> optimization (for example using transferables for communicating with
> workers). A more substantial improvement has to come from shaders.
>
> I think most Nurbs examples from Basic Archive are working, after
> fixing them as previously reported.
>
> Some details: The Curve tessellation is strictly subdivision following
> the tessellation hints as speced. The Ayam surface tessellation is
> adaptive with a threshold being influenced by the tessellation hints
> as well.
> The tessellation (and animation by deformation) will spawn web
> workers/threads. The maximum number of workers is aggressively set and
> can max out CPUs. I probably should expose the number in a scene
> setting to scenes. It is defined in the x3dom-nurbs-pool.js file.
> Vertex animation does not recalculate automatic normals currently for
> performance but that could be added.
>
> The SweptSurface and SwungSurface are not implemented and I do not
> have a good idea how to.
> The NurbsTextureCoordinate is not implemented. Is it used ? Are the
> default texture coordinates usually ok ?
>
> Any comment or feedback welcome,
>
> -Andreas
>
>
>
>
> --
> Andreas Plesch
> Waltham, MA 02453
>
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