Avoid saw edges on 3d surfaces

📊 Plotly Python
1

Hello

I am building a surface from a list of points using

def surface(grid,metodo): #metodo='linear', 'cubic' o 'nearest'

    tx=grid[0]
    ty=grid[1]
    tz=grid[2]

    X = np.linspace(min(tx), max(tx))
    Y = np.linspace(min(ty), max(ty))
    X, Y = np.meshgrid(X, Y)  # 2D grid for interpolation
    Z = griddata((tx,ty),tz,(X,Y), 
                 method=metodo)
    
    return [tx,ty,tz,X,Y,Z]

Then given a list of points L, I define sL=surface(L,‘linear’) and the figure

fig=go.Figure()

fig.add_trace(go.Surface(  x=sL[3],y=sL[4],z=sL[5],
                           colorscale='brwnyl',
                           opacity = 1,
                           name='surface',
                           legendgroup='surface',
                           showlegend=True,
                           showscale=False))

fig.update_layout( 
                 scene = dict(
                     xaxis=dict(title='X', 
                                tickfont = dict(size = 10,color = 'black'),
                                title_font_size=10,
                                titlefont_color='black', 
                                backgroundcolor='white',
                                color='black',
                                gridcolor='gray'),
                     yaxis=dict(title='Y',
                                tickfont = dict(size = 10,color = 'black'),
                                title_font_size=10,
                                titlefont_color='black',  
                                backgroundcolor='white',
                                color='black',
                                gridcolor='gray'),
                      zaxis=dict(nticks=4,
                                tickfont = dict(size = 10,color = 'black'),
                                title='Z', 
                                title_font_size=10,
                                titlefont_color='black', 
                                range=[100,600],
                                backgroundcolor='white',
                                color='black', 
                                gridcolor='gray'),
                     aspectratio=dict(x=2, y=2, z=0.5)),
                     #aspectmode='data'),
                     scene_camera= camera
                 ) 

fig.show()

and the result is

newplot-9
newplot-91424×804 72.1 KB

How can I avoid the serrated edge?

Thanks

2

@bullejos To get help, please provide data. It’s unclear what type has the argument grid of the function surface.

3

Hi @empet ,

The grid data is just a list of points (in my case it is a list of points, with UTM_X, UTM_Y and elevation coordinates, which come from a list of points in a grid that are inside a polygon). The code linspace(min(tx), max(tx)) can be change by linspace(min(tx), max(tx), n ) with n a positive integer and if n is big enough steps at the border of the surface are smaller. This may be the only solution, I have seen other surfaces that appear to have a line as a border but when you get close enough the line is jagged.

Thais @empet