opengl_3d_example

[johnfercher]

Dear Omar,

I'm using the ImGui in some projects where I created a 3D World and I realized, there aren't a simple example of how to do that. So I made this pull request with an adaptation of opengl_example with this, to do that I used Glew and added some libs on Makefile, I only was able to test the Makefile with Ubuntu 14.04.

Example:

Sincerely,
Johnathan Fercher

[ocornut]

Hello Johnathan,
I'm not sure to see the added value of this example - the added code have nothing to do with ImGui afaik?

[johnfercher]

Exists some simulators that needs a virtual 3d/2d world and to simplify the interaction is added some GUI, like: https://github.com/SIRLab/VSS-Vision and https://github.com/roboime/ssl-sim, both working with robot soccer.
I choose ImGui cause it's simple to use, but I had some problems to connect the ideas. So I made this example, if you think this example doesn't add value to this repository it's ok.

[ocornut]

Oh I totally get why you want to use ImGui in a 3d application, this is what I do all the time :)
But as an example application to include in the ImGui repository (and that I have to maintain forever) I don't understand what this example is adding that relate to the ImGui itself. The examples are not mean to be OpenGL 3d tutorial.

but I had some problems to connect the ideas

I'm interested in your feedback about this. How else do you think the code/documentation/example could be improved that would have helped you?

Thanks!

[johnfercher]

I started trying to use freeglut3, but bugs happen when I defined the world in parameters of glut and ImGui, bugs like:

• An object rotating sometimes staying totally white
• ImGui::MainMenuBar() sometimes staying totally black

[ocornut]

Perhaps a case of selecting/not-selecting current shader. If you used the GL2 code it doesn't know about shader, so you may need to call glUseProgram(0) on your side before calling render. I will a add more explicit comment about that. Have you noticed this comment in README.txt:

opengl_example/
    OpenGL example, using GLFW + fixed pipeline.
    This is simple and should work for all OpenGL enabled applications.
    Prefer following this example to learn how ImGui works!
    (You can use this code in a GL3/GL4 context but make sure you disable the programmable pipeline
    by calling "glUseProgram(0)" before ImGui::Render.)

I will add it to the opengl_example/ code as well.

[johnfercher]

I Understand, I will test this.

[johnfercher]

It works =)

[valera-rozuvan]

@johnfercher You contribution lives on! = ) Check out https://github.com/valera-rozuvan/opengl-sample-with-imgui .

[johnfercher]

Nice @valera-rozuvan, Thx =).