title: 3d scatter plot remains empty in R plotly
body: <p>I have a simple question regarding a 3d scatter plot using the plotly package in R. It appears all of the plots are working with the exception of the 3d scatter and line plots. To test this I've tried the following code (= taken from the cheat sheet):</p>
  
  <pre><code>library(plotly)
  
  plot_ly(type = "scatter3d", x = c(9,8,5,1), y = c(1,2,4,8),z = c(11,8,15,3),
          mode = "markers")
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/MMG9Z.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MMG9Z.png" alt="enter image description here"></a></p>
  
  <p>I ended up with a plot containing only the axis and not the actual points. To troubleshoot I've added colors which got me confused as the legend with the color scale did appear but not the points themselves. I did notice the axis have the wrong scale ((80,-80),(60,-60),(100,-100)).</p>
  
  <p>Furthermore, the 3d surface plot en 2d scatter plot examples worked perfectly.</p>