Blank images and "dead pixels" in Makie

dalarev · September 10, 2019, 3:15pm

I run into blank images and “dead pixels” when running this Makie example (see below).

The bottom-center image is blank, while the bottom-right image has a “dead pixel” at the bottom-right corner; hard to see, but it is there and does not follow the smooth gradient of the rest of the plot.

I also have another MWE that produces this same “dead pixel” phenomena, and they seem to occur with heatmaps near the center and edges of the figures.

Has anyone run into this issue before? Appreciate the support!

sdanisch · September 10, 2019, 3:18pm

That’s pretty odd… What is your OS, julia and Makie/GLMakie/AbstractPlotting version?

sdanisch · September 10, 2019, 3:21pm

Also does it always happen, or is it more of a corruption?

sdanisch · September 10, 2019, 3:23pm

You should also try running this:

julia> ENV["MODERNGL_DEBUGGING"] = "true"
julia>]add ModernGL#master
julia>]build ModernGL

Restart Makie and try again…

dalarev · September 10, 2019, 3:35pm

Win 10 Pro, Julia v1.2.0 (on Atom 1.40.1), Makie v0.9.5 #master.

“build ModernGL” produced no changes and the plots look the same after Atom/Makie restart.

I’ve also tried reinstalling Makie.

I’ve tried many more Makie examples and I can’t get them to fail. The issue seems to be with 2D plots.

sdanisch · September 10, 2019, 3:40pm

Makie version isn’t important, GLMakie/AbstractPlotting is

“build ModernGL” produced no changes and the plots look the same after Atom/Makie restart.

So you have all the visual errors, but no further debug information is displayed?

Is this printing:

using ModernGL
joinpath(dirname(pathof(ModernGL)), "..", "deps", "deps.jl") |> read |> String

"const enable_opengl_debugging = true"?

What GPU do you have?

dalarev · September 10, 2019, 3:48pm

GLMakie v0.0.7, AbstractPlotting v0.9.10

using ModernGL
joinpath(dirname(pathof(ModernGL)), "..", "deps", "deps.jl") |> read |> String

prints

“const enable_opengl_debugging = true\n”

Visual errors persist with no further debug information printed.

My GPU is Radeon HD 6800.

sdanisch · September 10, 2019, 3:51pm

Of course, it’s AMD with their messy drivers -.-
I will see if I can reproduce it at home with an AMD gpu…

dalarev · September 10, 2019, 3:52pm

That’s both funny and sad…I appreciate the support, @sdanisch.

I’ve run the same code on a laptop with Intel GPU with none of these issues.

dalarev · September 11, 2019, 3:37pm

Another data point with a MWE:

using Makie#master 
x = range(-1,stop=1,length=100)
y = x'
A = x.^2 .+ y.^2 .< 0.5^2
scene = image(A,scale_plot=false)
sc_t  = title(scene,"Image")

“Image” displays properly, but it is not ideal because it interpolates the image.
“Heatmap” displays nothing at all.

sdanisch · September 11, 2019, 3:41pm

oh… can you try scene = heatmap(A,scale_plot=false, interpolate = true)?

dalarev · September 11, 2019, 3:43pm

Hmm…

sdanisch · September 11, 2019, 4:03pm

That’s pretty interesting!
Can you try:

A = reshape(repeat(1:10, 10), 10, 10)
colors = Colors.distinguishable_colors(11)[2:end]
scene = heatmap(A,scale_plot=false, interpolate = true, colormap = colors)
scene = heatmap(A,scale_plot=false, interpolate = false, colormap = colors)

dalarev · September 11, 2019, 4:15pm

Came up in Juno Plot pane and separate Makie window:

dalarev · September 11, 2019, 4:25pm

Tried removing the Boolean threshold to plot the “analog” pattern, and the center/corner pixels are back:

x = range(-1,stop=1,length=100)
y = x'
A = x.^2 .+ y.^2

dalarev · September 11, 2019, 4:35pm

One consistent issue I’ve found is that if I define or print the array in REPL after opening a Makie scene, I get a ton of errors in the REPL.

They start with “UndefVarError: warn not defined”, “Stacktrace: glBindBuffer”, etc.

Lots of errors from ModernGL and GLAbstraction.

This only happens when the array A is defined/printed in REPL after calling a Makie scene window.

sdanisch · September 11, 2019, 8:34pm

Oh wow… So that’s why there are no warnings with debugging enabled:
https://github.com/JuliaGL/ModernGL.jl/blob/e1eb1b60fbd9b16c09e976901ddcd05ddd69f75b/src/functionloading.jl#L16
I just fixed it directly on master… so could you fetch ]add ModernGL#master and try again? Also make sure that the ENV is still set to debugging

sdanisch · September 11, 2019, 9:00pm

Finally got a chance to try this with my AMD desktop…Can’t reproduce it… So hopefully you can get the warnings after checking out ModernGL#master… Maybe you can also check if you have the newest drivers? I remember there were different ways to make sure that you have the newest AMD drivers on windows,and some would leave you with old drivers… Maybe that’s the issue!

dalarev · September 11, 2019, 9:26pm

Alright, fetched the latest ModernGL#master and confirmed that ENV is set to debugging.

x = range(-1,stop=1,length=100)
y = x'
A = x.^2 .+ y.^2 .< 0.5^2
scene = heatmap(A,scale_plot=false)

Still shows as a black square. There are no errors once I run the script, but a flood of errors once I type pretty much anything into the REPL.

I saved the warnings from the REPL after typing “A” but it is a pretty long list. Is there a way to upload a text file or should I just paste it here?

sdanisch · September 11, 2019, 9:29pm

gist.github.com? If it’s just always the same, maybe condense it?