please, point me at examples of something like smoothelevation.asy
from Asymptote gallery, mesh of Bezier patches with per-vertex colors,
put to some real use, interactive use preferred.
The reason: a convincing use case may help to push vertex colored
NURBS into the next version of X3D standard, making it a better future
output format for Asymptote (when, FSM willing, I'll have time to
modify my 3D PDF output routines to produce X3D).
I can find examples of meshes of Bezier, NURBS, or other curved
triangles or quads and, easily, examples of flat triangle or rectangle
meshes with vertex colors.
But when I look for meshes with both non-flat elements and vertex
colors I fail to find examples but among Asymptote examples.
Sincerely, Michail
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If you look at the PRC versions of these examples, you will see that they look "pixelated" (or worse, in the case of vertexshading) since each of the 4 vertices of a patch are forced to share the same color.
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Dear John (and All),
I am looking for something out of Asymptote gallery.
For example Asymptote output (bezier patches and verstex shaiding) used in a published work (not one about Asymptote).
To convince people some feature is worth including in a public format I'd better show that there is demand for vertexcolored NURBS, not just that there is one tool that produces such obscure constructs.
"Supply will create its own demand" is an argument, but demonstrating existing demand is better.
Sincerely, Michail
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It will be difficult to find a 3D interactive non-tesselated example with vertex-dependent colors that wasn't drawn with Asymptote since none of the existing 3D graphics formats support this.
That is precisely why we need v3d. :-)
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Dear All,
please, point me at examples of something like smoothelevation.asy
from Asymptote gallery, mesh of Bezier patches with per-vertex colors,
put to some real use, interactive use preferred.
The reason: a convincing use case may help to push vertex colored
NURBS into the next version of X3D standard, making it a better future
output format for Asymptote (when, FSM willing, I'll have time to
modify my 3D PDF output routines to produce X3D).
I can find examples of meshes of Bezier, NURBS, or other curved
triangles or quads and, easily, examples of flat triangle or rectangle
meshes with vertex colors.
But when I look for meshes with both non-flat elements and vertex
colors I fail to find examples but among Asymptote examples.
Sincerely, Michail
A good example, which I use in education is the complex Gamma Function:
https://asymptote.sourceforge.io/gallery/3Dgraphs/gamma3.html
If you press the m key you will see that the patches are not flat.
A simpler example is the Bezier triangle in
https://asymptote.sourceforge.io/gallery/3Dwebgl/vertexshading.html
Here are two further examples from physics:
https://asymptote.sourceforge.io/gallery/3Dwebgl/sphericalharmonic.html
https://asymptote.sourceforge.io/gallery/3Dwebgl/p-orbital.html
If you look at the PRC versions of these examples, you will see that they look "pixelated" (or worse, in the case of vertexshading) since each of the 4 vertices of a patch are forced to share the same color.
Dear John (and All),
I am looking for something out of Asymptote gallery.
For example Asymptote output (bezier patches and verstex shaiding) used in a published work (not one about Asymptote).
To convince people some feature is worth including in a public format I'd better show that there is demand for vertexcolored NURBS, not just that there is one tool that produces such obscure constructs.
"Supply will create its own demand" is an argument, but demonstrating existing demand is better.
Sincerely, Michail
It depends what you mean by published. Here is an online textbook that I co-authored:
http://www.math.ualberta.ca/~bowman/m411/m411.pdf
It will be difficult to find a 3D interactive non-tesselated example with vertex-dependent colors that wasn't drawn with Asymptote since none of the existing 3D graphics formats support this.
That is precisely why we need v3d. :-)