Loading a mesh and creating screen capture

[abahm]

Hi Simon,

I'm working with mesh objects (from the Meshes package), and need to

1. display a mesh in 3D, and
2. take a screen grab to save as an image
3. adjust camera (angle, position), and loop back to 2.

Can your package already do either of these? I think I can implement the first myself, but for the second and third I have no clue. I would really be handy if I could automate the "snapshot"ting of meshes. My goal of snapshots is to ultimately eventually create a movie of the surface rotating from a set of images.

I'm excited to finally get my simulation towards using your package. Let me know your thoughts.

Best regards,
Alan

[SimonDanisch]

Oh cool :) Actually, just yesterday I implemented a better version of the
mesh display! The rest should be relatively easy. Not everything is
perfectly in place yet, but if you can supply me with some examples and
more infos i can certainly give you a code snippet!
On 13 Dec 2014 22:53, "Alan Bahm" notifications@github.com wrote:

Hi Simon,

I'm working with mesh objects (from the Meshes package), and need to

1. display a mesh in 3D, and
2. take a screen grab to save as an image
3. adjust camera (angle, position), and loop back to 2.

Can your package already do either of these? I think I can implement the
first myself, but for the second and third I have no clue. I would really
be handy if I could automate the "snapshot"ting of meshes. My goal of
snapshots is to ultimately eventually create a movie of the surface
rotating from a set of images.

I'm excited to finally get my simulation towards using your package. Let
me know your thoughts.

Best regards,
Alan

—
Reply to this email directly or view it on GitHub
#20.

[abahm]

Hi Simon,

Here is a surface that I'm evolving, at different timesteps, as visualized
in meshlab http://meshlab.sourceforge.net/. I'm also attaching the .ply
output from the simulation.

[image: Inline image 1]

Inside my julia code, I have a Mesh (from the great Meshes package
https://github.com/twadleigh/Meshes.jl). I'm using the level set method
http://en.wikipedia.org/wiki/Level_set_method to evolve an embedded
surface. These are level sets from a cubic volume.

I just want a streamlined workflow, where I don't have to use meshlab
(though it is very nice), and your package looks like it could do that for
me. I just need it to allow me to load a Meshes.Mesh, (or a .ply),
display from an angle and save a snapshot .png file to disk.

Does that help?

Alan

On Sat, Dec 13, 2014 at 2:00 PM, Sdanisch notifications@github.com wrote:

Oh cool :) Actually, just yesterday I implemented a better version of the
mesh display! The rest should be relatively easy. Not everything is
perfectly in place yet, but if you can supply me with some examples and
more infos i can certainly give you a code snippet!
On 13 Dec 2014 22:53, "Alan Bahm" notifications@github.com wrote:

Hi Simon,

I'm working with mesh objects (from the Meshes package), and need to

1. display a mesh in 3D, and
2. take a screen grab to save as an image
3. adjust camera (angle, position), and loop back to 2.

Can your package already do either of these? I think I can implement the
first myself, but for the second and third I have no clue. I would
really
be handy if I could automate the "snapshot"ting of meshes. My goal of
snapshots is to ultimately eventually create a movie of the surface
rotating from a set of images.

I'm excited to finally get my simulation towards using your package. Let
me know your thoughts.

Best regards,
Alan

—
Reply to this email directly or view it on GitHub
#20.

—
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#20 (comment)
.

[abahm]

Hi Simon, I didn't see github display the picture or attachments, so I'm
re-forwarding directly. :-)

Alan

---------- Forwarded message ----------
From: Alan Bahm alanbahm@gmail.com
Date: Sun, Dec 14, 2014 at 9:01 AM
Subject: Re: [GLPlot.jl] Loading a mesh and creating screen capture (#20)
To: "SimonDanisch/GLPlot.jl" <
reply@reply.github.com

Hi Simon,

Here is a surface that I'm evolving, at different timesteps, as visualized
in meshlab http://meshlab.sourceforge.net/. I'm also attaching the .ply
output from the simulation.

[image: Inline image 1]

Inside my julia code, I have a Mesh (from the great Meshes package
https://github.com/twadleigh/Meshes.jl). I'm using the level set method
http://en.wikipedia.org/wiki/Level_set_method to evolve an embedded
surface. These are level sets from a cubic volume.

I just want a streamlined workflow, where I don't have to use meshlab
(though it is very nice), and your package looks like it could do that for
me. I just need it to allow me to load a Meshes.Mesh, (or a .ply),
display from an angle and save a snapshot .png file to disk.

Does that help?

Alan

On Sat, Dec 13, 2014 at 2:00 PM, Sdanisch notifications@github.com wrote:

Oh cool :) Actually, just yesterday I implemented a better version of the
mesh display! The rest should be relatively easy. Not everything is
perfectly in place yet, but if you can supply me with some examples and
more infos i can certainly give you a code snippet!
On 13 Dec 2014 22:53, "Alan Bahm" notifications@github.com wrote:

Hi Simon,

I'm working with mesh objects (from the Meshes package), and need to

1. display a mesh in 3D, and
2. take a screen grab to save as an image
3. adjust camera (angle, position), and loop back to 2.

Can your package already do either of these? I think I can implement the
first myself, but for the second and third I have no clue. I would
really
be handy if I could automate the "snapshot"ting of meshes. My goal of
snapshots is to ultimately eventually create a movie of the surface
rotating from a set of images.

I'm excited to finally get my simulation towards using your package. Let
me know your thoughts.

Best regards,
Alan

—
Reply to this email directly or view it on GitHub
#20.

—
Reply to this email directly or view it on GitHub
#20 (comment)
.

[SimonDanisch]

I'm still not seeing the image ;)
But its okay, if I don't stumble upon any problems I'll push meshes support tomorrow.
If you want to get a feel for the screen cast process, you can play around with the screenshot and timeseries function in GLPlot/src/util.jl. (Not exportet yet and in GLPlot master)
You can use it like this:

using GLAbstraction, GLPlot, Reactive, GLFW
window = createdisplay(w=1920, h=1280)
# Take some signal to initiate the screenshot. For example pressing a button.
# You can use fps(30.0) to create a signal which fires 30 times a second.
lift(window.inputs[:buttonspressed], window.inputs[:framebuffer_size]) do buttonset, ws
  if GLFW.KEY_S in buttonset 
    GLPlot.screenshot(ws)
  end
end

[abahm]

Thanks!

On Sun, Dec 14, 2014 at 1:45 PM, Sdanisch notifications@github.com wrote:

I'm still not seeing the image ;)
But its okay, if I don't stumble upon any problems I'll push meshes
support tomorrow.
If you want to get a feel for the screen cast process, you can play around
with the screenshot and timeseries function in GLPlot/src/util.jl. (Not
exportet yet and in GLPlot master)
You can use it like this:

using GLAbstraction, GLPlot, Reactive, GLFW
window = createdisplay(w=1920, h=1280)# Take some signal to initiate the screenshot. For example pressing a button.# You can use fps(30.0) to create a signal which fires 30 times a second.lift(window.inputs[:buttonspressed], window.inputs[:framebuffer_size]) do buttonset, ws
if GLFW.KEY_S in buttonset
GLPlot.screenshot(ws)
endend

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#20 (comment)
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[SimonDanisch]

By the way, screenshot is an unsafe operation and I still don't really know, why its unsafe (besides that I don't check the window dimensions)
Fact is, that it either just works, or it gave me a random segfault...

Do you want to animate the mesh itself, or just the camera?
If yes, does the vertex count change? Do have any plans to color the mesh?
You can send me the ply to sdanisch@gmail.com ;)
Best,
Simon

[SimonDanisch]

Okay, checkout GLAbstraction/master and GLPlot/meshes and you can look at examples/mesh.jl.
The light model is still not correct, but it should give you a first impression.

[abahm]

Thanks! The code looks simple to use! As I run examples/mesh.jl at the moment I get:
ERROR: error in method definition: function Color.RGB must be explicitly imported to be extended
in include at ./boot.jl:245
in include_from_node1 at ./loading.jl:128
in include at ./boot.jl:245
in include_from_node1 at ./loading.jl:128
in reload_path at loading.jl:152
in _require at loading.jl:67
in require at loading.jl:51
in include at ./boot.jl:245
in include_from_node1 at ./loading.jl:128
while loading /Users/abahm/.julia/v0.3/GLPlot/src/mesh.jl, in expression starting on line 146
while loading /Users/abahm/.julia/v0.3/GLPlot/src/GLPlot.jl, in expression starting on line 31

[SimonDanisch]

Can you try the new version? I can't reproduce it on 0.4 ;)

[abahm]

I can't upgrade to v0.4 just now - I'm in the middle of generating
results. But I will before the end of the year. :-) thanks for all your
work.

On Tue, Dec 16, 2014 at 8:49 AM, Sdanisch notifications@github.com wrote:

Can you try the new version? I can't reproduce it on 0.4 ;)

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#20 (comment)
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[SimonDanisch]

Does it work now? It is supposed to work on 0.3 ;)
No worries, its way more fun to develop when I know that it will be used!

On Wed, 17 Dec 2014 19:56 Alan Bahm notifications@github.com wrote:

I can't upgrade to v0.4 just now - I'm in the middle of generating
results. But I will before the end of the year. :-) thanks for all your
work.

On Tue, Dec 16, 2014 at 8:49 AM, Sdanisch notifications@github.com
wrote:

Can you try the new version? I can't reproduce it on 0.4 ;)

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<
https://github.com/SimonDanisch/GLPlot.jl/issues/20#issuecomment-67190870>

.

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#20 (comment)
.

[abahm]

:-)

Hmmm, now I see this:

ERROR: error compiling GLMesh: unsupported or misplaced expression => in
function GLMesh
in toopengl at /Users/abahm/.julia/v0.3/GLPlot/src/mesh.jl:207
in glplot at /Users/abahm/.julia/v0.3/GLPlot/src/GLPlot.jl:38
in include at ./boot.jl:245
in include_from_node1 at ./loading.jl:128
while loading
/Users/abahm/src/beam-chemistry-code/DiamondEtch/display3d.jl, in
expression starting on line 37

On Wed, Dec 17, 2014 at 11:17 AM, Sdanisch notifications@github.com wrote:

Does it work now? It is supposed to work on 0.3 ;)
No worries, its way more fun to develop when I know that it will be used!

On Wed, 17 Dec 2014 19:56 Alan Bahm notifications@github.com wrote:

I can't upgrade to v0.4 just now - I'm in the middle of generating
results. But I will before the end of the year. :-) thanks for all your
work.

On Tue, Dec 16, 2014 at 8:49 AM, Sdanisch notifications@github.com
wrote:

Can you try the new version? I can't reproduce it on 0.4 ;)

—
Reply to this email directly or view it on GitHub
<

https://github.com/SimonDanisch/GLPlot.jl/issues/20#issuecomment-67190870>

.

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<
https://github.com/SimonDanisch/GLPlot.jl/issues/20#issuecomment-67373053>

.

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#20 (comment)
.