I am running in some unexpected behavior with GLMakie, surface plots and matrices that contain NaN as a value. My minimum working example below produces the following plots of three different 4 x 4 matrices with different elements set to NaN: [image] What causes the darker shading of cells adja…

[Makie_NaN_replaced_by_Inf] NB: using Inf workaround as indicated further above.

The behavior in your post is actually what I want. Smooth edges would be nice, I agree with you on that, but I would actually settle for what you already had! The problem is, however, that your code produces a completely different looking image on the most current Makie version. It now shows simila…

Empirical tip for the latest Makie version: replace NaN by Inf [Makie_surface_NaN_replaced_by_Inf] PS: but result is still not shaved though…

The shader computes normals using the surrounding grid positions. If those have weird values the normals will have weird values and the lighting calculation will do weird things. Setting shading = false should get rid of the dark rectangles (or alternatively setting diffuse=Vec3f0(0), specular = Vec…

@ffreyer , fyi none of your solutions worked for me. The result is still as displayed by @vettert for the truncated paraboloid example.

using GLMakie x = 0.0:3.0 y = 0.0:3.0 Z1 = reshape([100*i+50*j for i in x for j in y], (length(x), length(y))) Z2 = copy(Z1) Z3 = copy(Z1) Z2[1,1] = NaN Z3[1:2, 1:2] .= NaN f = Figure(resolution = (800, 800)) ax1 = Axis3(f[1, 1], aspect = (1, 1, 1)) ax2 = Axis3(f[1, 2], aspect = (1, 1, 1)) ax3 = …

The reason for the surface to drop like it does is that the shader converts nan values to 0. You could work around that by passing the modified z-values as colors, i.e. surface!(ax3,x,y,Z1,shading=false, color = Z3) [Screenshot from 2021-07-23 15-17-51] I guess for a smooth cut we’d need a shade…

Thanks to both of you @ffreyer and @rafael.guerra . Here is the full code that gets close to what I wanted. using GLMakie x = 0.0:3.0 y = 0.0:3.0 Z1 = reshape([100*i+50*j for i in x for j in y], (length(x), length(y))) Z2 = copy(Z1) Z3 = copy(Z1) Z4 = copy(Z1) Z5 = copy(Z1) Z2[1,1] = NaN Z3[1:2,…

Makie surface and NaN values

Specific Domains Visualization

rafael.guerra July 23, 2021, 11:01am 2

Just for reference, linking a related issue here, for which did not get an answer.

Topic		Replies	Views
How to set nan_color in Makie volume plot Visualization plotting , glmakie	0	80	December 22, 2025
GLMakie: masking values when plotting images Visualization question , plotting	6	810	August 18, 2021
Surface plot with gaps in data Visualization makie	2	332	January 4, 2023
Makie contours with NaN data: contour labels are on top of lines New to Julia plotting , makie	8	299	October 3, 2026
3D surface plot with GR backend error from certain camera angles Visualization	1	257	May 29, 2023

Makie surface and NaN values

Related topics