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Description
I think there is an issue in the way the lines plot by a contours in a Surface object when selecting the color.
I think the color is not being correctly selected by each of the lines. They are supposed to follow the colorscale, but they just follows half of it.
Here there is a minimum example of code to simulate the error:
import numpy as np
import plotly.graph_objects as go
x = np.linspace(0, 1, 100)
y = np.linspace(0, 1, 100)
x_grid, y_grid = np.meshgrid(x, y)
z = x_grid + y_grid
params = {
'colorscale': 'rainbow',
'surfacecolor': z,
'showscale': True,
'colorbar': {
'title': 'z',
},
'contours_z': {
'show': True,
'usecolormap': True,
"project_z": True,
}
}
trace = go.Surface(
x=x,
y=y,
z=z,
**params)
fig = go.Figure(data=[trace])
fig.write_image("test.png")
fig.show()
In the example, the expected behavior will be for the contour lines to be the same color as the surface, but they are not.
