Per-face colors in plot_trisurf about ipyvolume HOT 5 OPEN

Thanks, I'll keep this open and dive into it later, maybe it is possible more efficiently.

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Hi Eric,

I've modified the docs, it is only possible to specify per vertex properties, and these will be interpolated (at least that I know of, for WebGL).
A workaround is thus to duplicate the vertices:

ipv.figure()
colors = np.ones((6,3))*.3
colors[:3, 2] = 1.0
colors[3:, 0] = 1.0
x = [0, 3., 3., 0, 0., 3.]
y = [0, 0., 4., 0, 4., 4.]
z = [1, 0., 1., 1, 0., 1.]
ipv.plot_trisurf(x, y, z, 
                triangles=[[0, 1, 2], [3, 5, 4]], color=colors)
ipv.show()

Maybe it's an idea to have face_colors supported, that would do this automatically.
I've also updated the documentation for this. Let me know if this solves it.

cheers,

Maarten

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Hi Maarten,

Yes, the docs update will be helpful for others, and for now I can duplicate the vertices as you suggest. I'm doing some tests with fairly large meshes — O(10^6) vertices from a research weather radar — so there is some downside to duplicating, but I should still be ok.

In the future, +1 for face_colors support!

Thanks,
Eric

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Another thought: I was using the face_colors support in vispy in some earlier tests. Not sure if they also auto-duplicated vertices, or if they used some lower-level GL support for face colors.

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I think this can be done at the kernel side first, I guess face_colors and triangle_colors arguments to plot_* would need to sort out the duplication of vertices manually.

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