ERROR: could not spawn displaz

[juliohm]

When I try to run the simple example in the README:

using Displaz

plot3d!(10*randn(3,100000))

ERROR: could not spawn displaz -script -server default -label 'Points [100000 vertices]' -shader generic_points.glsl -rmtemp /tmp/juliaH7jSmY.ply: no such file or directory (ENOENT)
in _jl_spawn(::String, ::Array{String,1}, ::Ptr{Void}, ::Base.Process, ::RawFD, ::RawFD, ::RawFD) at ./process.jl:321
in #412 at ./process.jl:478 [inlined]
in setup_stdio(::Base.##412#413{Cmd,Ptr{Void},Base.Process}, ::Tuple{RawFD,RawFD,RawFD}) at ./process.jl:466
in #spawn#411(::Nullable{Base.ProcessChain}, ::Function, ::Cmd, ::Tuple{RawFD,RawFD,RawFD}, ::Bool, ::Bool) at ./process.jl:477
in run(::Cmd) at ./process.jl:591
in #plot3d#9(::Array{Int64,1}, ::Array{Float64,1}, ::Array{Int64,1}, ::Void, ::Array{Int64,1}, ::Bool, ::Array{Any,1}, ::Function, ::Displaz.DisplazWindow, ::Array{Float64,2}) at /home/juliohm/.julia/v0.5/Displaz/src/Displaz.jl:327
in (::Displaz.#kw##plot3d)(::Array{Any,1}, ::Displaz.#plot3d, ::Displaz.DisplazWindow, ::Array{Float64,2}) at ./:0
in #plot3d!#13(::Array{Any,1}, ::Function, ::Displaz.DisplazWindow, ::Array{Float64,2}) at /home/juliohm/.julia/v0.5/Displaz/src/Displaz.jl:341
in plot3d!(::Displaz.DisplazWindow, ::Array{Float64,2}) at /home/juliohm/.julia/v0.5/Displaz/src/Displaz.jl:341
in #plot3d!#14(::Array{Any,1}, ::Function, ::Array{Float64,2}) at /home/juliohm/.julia/v0.5/Displaz/src/Displaz.jl:346
in plot3d!(::Array{Float64,2}) at /home/juliohm/.julia/v0.5/Displaz/src/Displaz.jl:346

[juliohm]

This issue is happening probably because of the file generic_points.glsl. Can you please take a look at it?

[c42f]

Did you install displaz itself (https://github.com/c42f/displaz), and is it accessible in your path?

[juliohm]

Hi @c42f , I had everything installed correctly, but not in the system path. I did read the deps/build.jl file and have defined DISPLAZ_CMD instead in my .juliarc.jl thinking that this would be enough.

I then erased DISPLAZ_CMD from .juliarc.jl and added /opt/displaz/bin to my path. Everything is working now.

Maybe there is a bug in the way this variable is being used? Is it deprecated?

I am closing the issue for now.

[c42f]

Ok, that makes sense. You've got a few options here:

• Put displaz in your PATH, or get DISPLAZ_CMD into the ENV map before you run using Displaz.
• Call set_displaz_cmd() after running using Displaz.

[juliohm]

Thanks @c42f , I solved it with the PATH for now, but it seems that the DISPLAZ_CMD approach is not working, worth checking it in another machine.

[c42f]

Seems to work for me, for instance, I can break it by adding "DISPLAZ_CMD" to the environment as follows

julia> ENV["DISPLAZ_CMD"] = "asdf"
"asdf"

julia> using Displaz

julia> plot3d(randn(3,1000))
ERROR: could not spawn `asdf -script -add -server default -label 'Points [1000 vertices]' -shader generic_points.glsl -rmtemp /tmp/juliayz39mb.ply`: no such file or directory (ENOENT)
 in _jl_spawn(::String, ::Array{String,1}, ::Ptr{Void}, ::Base.Process, ::RawFD, ::RawFD, ::RawFD) at ./process.jl:321
 in #412 at ./process.jl:478 [inlined]
 in setup_stdio(::Base.##412#413{Cmd,Ptr{Void},Base.Process}, ::Tuple{RawFD,RawFD,RawFD}) at ./process.jl:466
 in #spawn#411(::Nullable{Base.ProcessChain}, ::Function, ::Cmd, ::Tuple{RawFD,RawFD,RawFD}, ::Bool, ::Bool) at ./process.jl:477
 in run at ./process.jl:591 [inlined]
 in #plot3d#9(::Array{Int64,1}, ::Array{Float64,1}, ::Array{Int64,1}, ::Void, ::Array{Int64,1}, ::Bool, ::Array{Any,1}, ::Function, ::Displaz.DisplazWindow, ::Array{Float64,2}) at /home/cfoster/.julia/v0.5/Displaz/src/Displaz.jl:326
 in plot3d(::Displaz.DisplazWindow, ::Array{Float64,2}) at /home/cfoster/.julia/v0.5/Displaz/src/Displaz.jl:279
 in #plot3d#15(::Array{Any,1}, ::Function, ::Array{Float64,2}) at /home/cfoster/.julia/v0.5/Displaz/src/Displaz.jl:346
 in plot3d(::Array{Float64,2}) at /home/cfoster/.julia/v0.5/Displaz/src/Displaz.jl:346

[juliohm]

Oh, I was just creating a variable DISPLAZ_CMD = "path/to/displaz instead of setting Julia's ENV dictionary. Sorry for the noise 😊

[c42f]

No problem at all. I should improve the documentation to make this clearer. The functions are individually documented, but the overview in the README is very sparse.