Add 3D capabilities

[flying-sheep]

For techniques like spectral decomposition (PCA, diffusion maps, …), the actual units on the axes are less important than visual closeness and separation.

A 3D→2D projection of three principal/diffusion components is therefore desirable and more useful than a plot matrix (like ggpairs)

[hadley]

Unfortunately this is outside the scope of ggplot2

[flying-sheep]

and why, if i may ask?

[lefft]

interesting -- anyone have any insight on the main challenges for representing 3d surfaces or scatterplots in ggplot2::??

from a user perspective, the syntax could be straightforward:

ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, z=Petal.Length, color=Species) + 
  geom_3d_scatter()

but obviously this says nothing about how complicated the implementation would have to be!

[thomasp85]

Have a look at https://github.com/AckerDWM/gg3D

But be aware that there are probably reasons beyond technical for the lack of 3D support in ggplot2

[flying-sheep]

“out of scope” includes the possibility of a technical reason in my eyes, as well as “it’s too hard to implement” and “it inflates the API too much”.

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