Bug Report: go.Surface doesn't show the outthrust value!

[lhg1992]

I'm coming to report another bug on the go.Surface.
As the code shown below, you can easily get the bug.
The plotly go.Surface only plots the Contour_Val in rectangular shape. It completely ignores those outthrust values in the 'Contour_Val' matrix.

The Matplotlib shows the correct surface(or contour).

import numpy as np
X=np.array([
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900., 8000.00, 8100.00, 8200., 8300., 8400., 8500.],
       [7800., 7900.00, 8000.00, 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900., 8000.00, 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.],
       [7800.,   7900.,   8000., 8100., 8200., 8300., 8400., 8500.]])

Y=np.array([
       [3800.,   3800.,   3800., 3800., 3800., 3800., 3800., 3800.],
       [3900.,   3900.,   3900., 3900., 3900., 3900., 3900., 3900.],
       [4000.,   4000.,   4000., 4000., 4000., 4000., 4000., 4000.],
       [4100.,   4100.,   4100., 4100., 4100., 4100., 4100., 4100.],
       [4200.,   4200.,   4200., 4200., 4200., 4200., 4200., 4200.],
       [4300.,   4300.,   4300., 4300., 4300., 4300., 4300., 4300.],
       [4400.,   4400., 4400.00, 4400.00, 4400., 4400., 4400., 4400.],
       [4500., 4500.00, 4500.00, 4500., 4500., 4500., 4500., 4500.],
       [4600.,   4600., 4600.00, 4600., 4600., 4600., 4600., 4600.],
       [4700.,   4700.,   4700., 4700., 4700., 4700., 4700., 4700.],
       [4800.,   4800.,   4800., 4800., 4800., 4800., 4800., 4800.]])

Contour_Val= np.array([
       [          np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan,         np.nan, 12169.04428749,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan,         np.nan, 12128.33946596, 12114.37604446,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan, 12146.50058674, 12110.75061221, 12094.0645444 ,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan, 12154.96379352, 12116.42568321,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan, 12186.79247811, 12145.38853514,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan, 12241.85245564, 12197.51679624,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan, 12385.14869121, 12319.78169639,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan, 12419.96884955,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan],
       [          np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan,         np.nan]])


# %% matplotlib version
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(1,1,1, projection='3d')
ax.set_proj_type('ortho') 
ax.axis('equal')
surf = ax.contourf(X, Y, Contour_Val, zdir='z', 
                offset=50,  # plot at z=offset
                cmap='jet')
ax.set_xlim([X.min(), X.max()])
ax.set_ylim([Y.min(), Y.max()])
ax.set_zlim([0, 100])

ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.view_init(elev=90, azim=0)

# show the figure
plt.show()
# %% plotly version
'''
bug: the outthrust values are not plotted!
'''
import plotly.graph_objects as go

plotz=50
Z=np.full_like(Contour_Val, plotz)
mask = np.isnan(Contour_Val) # mask for NaN values
Z[mask]=np.nan  # apply mask to Z

fig = go.Figure()
fig.add_trace( go.Surface(
    x=X.round(2), 
    y=Y.round(2), 
    z=Z.round(2),# plot contour on the plane z=plotz
    surfacecolor=Contour_Val, # use Contour_Val as the surface color

    text=Contour_Val.round(2),
    name='contour',
    
    colorscale='jet',

    showscale=True,
    opacity=0.8,  # <1 to make the contour plane semi-transparent

    hoverinfo='x+y+text+name', # works well

))

fig.show()

Matplotlib version (correct):

Plotly version (wrong):

only those values which form a regular rectangular shape in the matrix are effective in go.Surface plot:

Solution suggestion:
Either modify the go.Surface or the go.Contour to make it possible to plot the 2D contour on any plane in a 3D figure.

Hope this issue can be solved together with [#5157] soon. Thanks!

[gvwilson]

Thanks for the bug reports @lhg1992 - realistically, it'll be quite some time before we can put someone on these, but I'd be very happy to prioritize review of a PR from the community. Thanks - @gvwilson

[lhg1992]

Thanks for the bug reports @lhg1992 - realistically, it'll be quite some time before we can put someone on these, but I'd be very happy to prioritize review of a PR from the community. Thanks - @gvwilson

Thanks for your response.
I'm really looking forward to it. The go.Surface bugs really stop me from transferring my data visulization code from Matplotlib to Plotly.