I have data that has millions of rows and decided to plot it using Plotly in a 3 dimensional scatter plot. Since most of the points intersect with each other, I have decided to use an opacity value of 0.5. Naturally, the points in the legends become 50% opaque as well. However, I would like to have complete opaque points in the legend.
A sample that creates dummy data and shows the problem I've mentioned can be seen below.
library(dplyr)
library(plotly)
set.seed(77)
sample_data = data.frame(x = c(1:100), y = rnorm(100, mean = 1, sd = 0.5)) %>%
mutate(z = x*y,
attr = if_else(x>50,"Big","Small"))
plot_ly() %>%
add_trace(x = sample_data$x,
y = sample_data$y,
z = sample_data$z,
color = sample_data$attr,
colors = c("cyan4","orange"),
type = "scatter3d",
mode = "markers",
opacity = 0.5,
size = 1) %>%
layout(legend = list(x = 0.5,
y = 0.9,
bgcolor = "rgba(0,0,0,0)"))
The points located in the legend which is underlined in red are transparent as shown in sample output below.
Finally, is there any way to set the alpha/opacity value of points in the legend of plotly, different from the points mapped inside the plot?