ternary plot does not work

[danton267]

None of the examples from here work: https://www.rdocumentation.org/packages/ggtern/versions/1.0.2.0/topics/ggtern

[cpsievert]

This would be a very large project, not only because there are nearly 30 geoms, but also because ggplotly() currently has no notion of ternary axes:

> grep("^Geom", getNamespaceExports("ggtern"), value = TRUE)
 [1] "GeomCrosshairTern"   "GeomLisoprop"       
 [3] "GeomLmark"           "GeomPointSwap"      
 [5] "GeomSmoothTern"      "GeomRline"          
 [7] "GeomLline"           "GeomRasterAnnTern"  
 [9] "GeomErrorbarr"       "GeomErrorbart"      
[11] "GeomMeanEllipse"     "GeomTextViewport"   
[13] "GeomErrorbarl"       "GeomConfidenceTern" 
[15] "GeomHexTern"         "GeomLabelViewport"  
[17] "GeomTmark"           "GeomTisoprop"       
[19] "GeomPolygonClosed"   "GeomTriTern"        
[21] "GeomInterpolateTern" "GeomDensityTern"    
[23] "GeomTline"           "GeomRisoprop"       
[25] "GeomRmark"           "GeomMask"    

I'd much rather see us focus on better documentation for the native ternary trace https://plotly.com/r/ternary-plots/ as well as other extension packages (#566) that would be higher leverage (ggtern currently gets 2.5k download/month, which is not very much)