OGRECave/ogre

Welcome to the Ogre3D channel - www.ogre3d.org

J.V.

@JV81608177_twitter

but idk if this is a good idea

Guillermo Ojea Quintana

@sercero

You could take a look at bgfx: https://github.com/bkaradzic/bgfx

I think this site is a good start: https://learnopengl.com/

Pavel Rojtberg

@paroj

for learning graphics I would recommend https://paroj.github.io/gltut/ because it gets the basics right - instead of just saying copy & paste this code to get that

but probably I am biased since I keep that tutorial available nowadays

Guillermo Ojea Quintana

@sercero

Yes, that is a great tutorial as well

J.V.

@JV81608177_twitter

Thanks

I'll take a look

Neonit

@Neonit

I have this very short and simple test program where I create an Ogre window, then destroy it, then exit. It segfaults. https://gist.github.com/Neonit/b0a0c8d6e8b6345a13e166c5411297a5 Can someone tell me, why? It's Ogre 2.2.4.

If I remove lines 14 and 16, there is no segfault.

SNiLD

@SNiLD

Well you haven't loaded the OpenGL3PlusRenderSystem plugin at all

But when you segfault it's usually more helpful to attach a debugger and see from there what's going on and what values each variable has

Neonit

@Neonit

I have added the backtrace from the debugger as comment at the end of the gist.

Maybe it's becaus I'm not loading the plugin. I'll try.

SNiLD

@SNiLD

Also you shouldn't create OpenGL3PlusRenderSystem yourself, you get it from root (for example with getAvailableRenderers)

(at least with Ogre 1)

David Young-Chan Kay

@DavidYKay

Hey folks!

My team and I are trying to render text to a 3D surface in OGRE 2.1. It seems we are having trouble properly calling datablock.setTexture(). I've typed up my situation in a gist if you'd like more information. https://gist.github.com/DavidYKay/2c70522f42a98d4672dc384b338cb7ac

Many thanks for any help you may be able to offer.

David Young-Chan Kay

@DavidYKay

Just got a response on the forums: https://forums.ogre3d.org/viewtopic.php?f=25&t=96100

Will implement and update if need be. Thanks very much!

Macoy Madson

@makuto

Hi, I've got a simple question: How do I sign up to edit the wiki?

I wrote a tutorial for Ogre 2.3 that I thought would be good to have in the wiki.

Macoy Madson

@makuto

(I will have to make some updates to match the community guidelines)

Matías N. Goldberg

@matiasgoldberg_twitter

Just login using your forum's username and password:
http://wiki.ogre3d.org/login

Macoy Madson

@makuto

Invalid username or password

I tried logging out and back in on the forum and didn't have any issues.
Does it take a while for the forum account to propagate to the wiki or something? I only registered yesterday

My username is macoy, in case that helps

Michelangelo Conserva

@MichelangeloConserva

Hello everyone!
I am integrating Bullet3 Physics into the Ogre renderer in Windows. At the moment I am trying to get the frameStarted function working.
It kinda works in the sense that I am able to printf and move a mesh but after a second or so the application doesn't respond.

51 replies

siN

@sindev95

hi guys , anyone has a plugin to import mesh files into blender ?

8 replies

Jason

@avengre

For future reference, when building the Ogre 1.12 build, the dependencies automatically download and compile (which is very nice!), however they only build the release, and link the release builds of the dependencies to the debug projects causing linker errors... is there a cmake file that can be edited to have both the debug/release to be autobuilt rather than just the release build?

4 replies

tomluchowski

@tomluchowski

Here is example ambient lighting from https://learnopengl.com/Lighting/Basic-Lighting , but the real question is how do I forward the ambientStrength value from the game code to the fragment shader ..... I suppose I need to do it in the material file ... but how, what is the general mechanism of doing it ?

void main()
{
//   float ambientStrength = 0.1;
    vec3 ambient = ambientStrength * lightColor;

    vec3 result = ambient * objectColor;
    FragColor = vec4(result, 1.0);
}

19 replies

tomluchowski

@tomluchowski

Hello, how do I get the TBN matrix , that is matrix build from Tangent , Bitangent, and Normal of a vertex ? I spend lot of time figuring out that layout (location = 3) in vec3 aTangent; won't work in my GLSL program and yield a wrong value...

5 replies

tomluchowski

@tomluchowski

I do use Ogre 1.12.9 and Linux OpenSuse 15.1 .... , and of course OpenGL, OpenGL3Plus

Grzegorz Futa

@grzesiekmq

Hi where to paste the amd_ags_x64.dll to what 'binary' folder?

3 replies

Christopher DiPaolo

@Impulse21

Hey, I am trying to create a VS solution for ogre-next by running the "build_ogre_Visual_Studio_16_2019_x64" script, however, it keeps erroring out. The Cmake error file only contains a single error stating "pthread.h not found". Am I missing a depedency?

14 replies

David Liu

@r2dliu

Has anyone managed to successfully link ogre libraries after building it statically on Windows?

I successfully built both 1.12.10 from source and also tried this with 1.12.9 from vcpkg. I'm working on a crossplatform solution so using CMake/writing CMakeLists rather than visual studio tooling. I'm trying to compile the same code as from the bootstrap tutorial, so I'm doing
find_package(OGRE REQUIRED COMPONENTS Bites RTShaderSystem)
and later
target_link_libraries(0_Bootstrap OgreBites OgreRTShaderSystem)

Trying to run this gets me lots of errors similar to Target "0_Bootstrap" links to target "SDL2::SDL2" but the target was not found., indicating the dependencies are not linked correctly. (SDL2, ZLib, and Imgui are some of the libs in question that error)

if I manually resolve them by doing a find_package(SDL2) and all the other missing packages, it still errors upon compilation. the command that fails is C:\...link.exe ...stuff... obj /out:src\0_Bootstrap.exe ...various.lib_files_being_linked... freetype.lib ...other.lib_files...

which naturally isn't surprising because the linker has no idea where freetype.lib is. This seems odd though, seeing as how the find_package(OGRE) stuff should've handled all the includes and libraries for me. I spent a while hacking at doing it without find_package and copying what the generated OgreTargets.cmake file did, but it was tedious and sifting through the undefined references was painful.

Is this a bug or am I missing something glaringly simple?

14 replies

J.V.

@JV81608177_twitter

Does ogre supports DX12 ?

Matías N. Goldberg

@matiasgoldberg_twitter

No. OGRE-next supports Vulkan, but no immediate plans for DX12 yet

(and Vulkan support is in experimental phase yet, it's quite stable actually, but I wouldn't say ready for production yet)

tomluchowski

@tomluchowski

https://ogrecave.github.io/ogre/api/1.12/class_ogre_1_1_material.html#a625d27ef43d359a6b4f2dc58a363af95 says it sets reflactense diffuse parameter for the pass .....How do I retrieve this parameter value inside my own fragment shader, is this ever possible for custom shader ? I have a C++ code which changes the color of a mesh material with setDiffuse setSpecular setAmbient for RTShaderMaterials. Now I try to migrate slowly to custom shaders and I don't want to overcomplicate it.

LesnyRumcajs

@LesnyRumcajs

Hello, I wanted to try out the code from this post https://www.ogre3d.org/2020/12/24/augmented-reality-made-simple-with-ogre-and-opencv but unfortunately I get an error AttributeError: module 'cv2.cv2' has no attribute 'ovis. I have opencv-contrib-python installed, so I thought I am good to go? In the article it says that ovis is an OpenCV module.

Pavel Rojtberg

@paroj

print(cv2.getBuildInformation())

and check that ovis was enabled. Probably it was not and you would have to build opencv from source.

LesnyRumcajs

@LesnyRumcajs

@paroj indeed, it's marked as unavailable. Thanks a lot!

Sanyi

@contle_gitlab

I just started with Ogre. Created a simple tetrahedron mesh with xml format and converted it with the mesh converter. If I order the face indices anti-clockwise, ogre shows me the back faces, if clockwise, it shows as expected. I rechecked many times, cannot imagine why, when all tutors says to order anti-clockwise.
Any ideas?

3 replies

Tomas Ayi

@tomasayi

Hi, I am starting with Ogre. I am using an Apalis i.MX8QM from Toradex. I'm running weston in a docker container, and in other container I have Ogre compiled. When I try to run SampleBrowser, i have the next error:
Loading library /usr/local/lib/OGRE/RenderSystem_GL.so.1.12.11
Installing plugin: GL RenderSystem
OpenGL Rendering Subsystem created.
Xlib: extension "GLX" missing on display ":0".
Segmentation fault.

6 replies

I am relatively new with Linux but I want to learn. I need some ideas to know how to solve this

Neonit

@Neonit

When running my program (which uses Ogre) from Visual Studio 2019, in the Output tab, it displays Ogre's output with an Ogre: prefix. The output on stdout from my code is not displayed. Any idea why that is? When I run the program from console, I see all the output.

1 reply

rrka

@rrka

Hello, does anyone have an example of simple integration dear imgui with 2.2+ opengl?

XXxR4GALXxx

@XXxR4GALXxx

how to set zlib.dll and SDL2.dll as static library when OGRE_STATIC is ON?

Game.exe depends SDL2.dll and zlib.dll :(

1 reply

Chris Hall

@chrishall_gitlab

I'm also trying to get this tutorial to work: https://www.ogre3d.org/2020/12/24/augmented-reality-made-simple-with-ogre-and-opencv
I'm trying to use docker for it. I first build opencv from source on ubuntu:20.04, to get ovis enabled I added:
apt install libogre-1.12 libogre-1.12-dev, ARG OGRE_DIR=/usr/share/OGRE/cmake/modules/, touch /usr/lib/x86_64-linux-gnu/libOgreGLSupport.a. It builds fine, I can access it in opencv.

However when I run: owin = cv2.ovis.createWindow("VR", (800,600)), I got a bunch of errors about missing zip files in /usr/share/OGRE/Media/packs/, so I downloaded all the missing files for the packs folder. Now I'm getting errors:

owin = cv2.ovis.createWindow("VR", (800,600))
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: failed to open /dev/dri/card0: No such file or directory
libGL error: failed to load driver: iris
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: failed to open /dev/dri/card0: No such file or directory
libGL error: failed to load driver: iris
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: failed to open /dev/dri/card0: No such file or directory
libGL error: failed to load driver: iris
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-1-347dc5cb1e73> in <module>
      1 import cv2
----> 2 owin = cv2.ovis.createWindow("VR", (800,600))

error: InternalErrorException: Unable to open zip file '/usr/share/OGRE/Media/volumeTerrain/volumeTerrainBig.zip' in load at /build/ogre-1.12-VXqDQG/ogre-1.12-1.12.4+dfsg1/OgreMain/src/OgreZip.cpp (line 221)

Is OpenGL required? I've tried downloading the content that goes in /usr/share/OGRE/Media/volumeTerrain/, but it still can't load the zip even though I can see it. Do I need to use an older version of libogre?

16 replies

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