Mesh3d plots no legend or colors

1

Hi, I’m making a 3dmesh type plot through R with the plot_ly function.

When I create other type of plots a legend with different colors appear and the corresponding colors applied in the plot.

But when I try to make a 3dmesh type plot, no legend shows up or lets me change the colors.

Any idea of what the problem can be??

Here is a screenshot of the result.

Thanks

Plot.jpg785×711 61.8 KB

2

Only certain trace types support legend items at the moment.

‘mesh3d’, ‘heatmap’, ‘contour’, ‘histogram2d’, ‘histogram2dcontour’, ‘choropleth’ and ‘surface’ all do not support legend items.

3

Hi Etienne,
And what about assigning a color to a mesh3d plot?
The chart reference documentation mentions the color attribute.
However this doesn’t seem to work. It always yields an warning message:

In RColorbrewer::brewer.pal(N, “Set2”):
minimal value for n is 3 returning requested palett with 3 different levels

Also, the hoverinfo doesn’t give the name but the value of color.
Thanks in advance for your answer.

4

@WHMan I suspect you’re using plot_ly(color = ...), which applies scaling/handling that you probably don’t want for a mesh3d plot. Instead, if you use plot_ly(marker = list(color = ...)), the values will be taken verbatim.

5

Thanks for your swift response @carson!

Unfortunately, it doesnt work. Here’s an example of my code:

> plot_ly(ell3d[[1]],x=vb[1,],
>         y=vb[2,], 
>         z=vb[3,],
>         showlegend=TRUE,legendgroup="ellipse",
>         contour=list(show=TRUE, color="#000", width=15),
>         type = "mesh3d", alphahull=0, opacity=0.2, marker=list(color = "#000"))

Capture.PNG1189×887 124 KB

As you can see the mesh is blue (and not black).

PS. sorry for hijacking this topic. If it’s more appropriate to start a new one, I will.

6

It appears I need to study the figure reference more closely! I’ve made a note of this problem and also provided a workaround here – https://github.com/ropensci/plotly/issues/413

7

Thanks for your workaround!
Works perfectly now.

8

i think the problem is that a colour legend does not work with mesh 3d.

i asked the plotly team and they were unable to give an answer/didnt know how to solve it.

my work around was the plot the same graph as a scatter 3d and put a colour legend in and then i cut and past the legend out for my final figure.

so i did this just to make my scale

plot_ly(
x = points[, 1], y = points[, 2], z = points[, 3],

marker = list(
autocolorscale = FALSE,
cmax = 2.5,
cmin = 0,
color = vert$colour,
#colorscale = vert$bi,
colorbar = “middle”,
colorscale = list(c(0, “#800026”),
list(0.2, “#bd0026”),
list(0.24, “#e31a1c”),
list(0.28, “#fc4e2a”),
list(0.32, “#fd8d3c”),
list(0.36, “#feb24c”),
list(0.4, “#ffffe5”),
list(0.44, “#d9f0a3”),
list(0.48, “#addd8e”),
list(0.52, “#78c679”),
list(0.56, “#41ab5d”),
list(0.6, “#238443”),
list(0.64, “#41b6c4”),
list(0.8, “#225ea8”),
list(1, “#081d58”)),
line = list(width = 0),
opacity = 0.9,
size = 20,
symbol = “circle”,
showscale=TRUE),

opacity = 0.5,
type=“scatter3d”,
mode= “markers”,
#visable=FALSE
)

9

i then added this scatter3d with an opacity of 0 to the original mesh3d graph

using >%> add trace and this provided a good workaround

ie make a second graph with your scale on it in a plotly format that accepts scales ie scatter3d, and then hide that second plot but not your scale