#openscenegraph

[born2bgeek]

Compile OpenSceneGraph on Ubuntu vivid

Quickly compiling OSG to add it to my project...right...Must have been a while since I’ve encountered such a broken makefile.

#1 Set up the compiler flags.

Somehow CMake did not find much of my libraries, might be my fault, might be not. This is my full CMake string:

cmake . \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_CXX_FLAGS=-fPIC \ -DCMAKE_C_FLAGS=-fPIC \ -DOPENGL_gl_LIBRARY=/usr/lib/fglrx/libGL.so.1 \ -DX11_X11_LIB=/usr/lib/x86_64-linux-gnu/libX11.so \ -DJPEG_LIBRARY=/usr/lib/x86_64-linux-gnu/libjpeg.so \ -DPNG_LIBRARY=/usr/lib/x86_64-linux-gnu/libpng.so \ -DPNG_PNG_INCLUDE_DIR=/usr/include/libpng12 \ -DZLIB_LIBRARY=/lib/x86_64-linux-gnu/libz.so.1 \ -DTIFF_LIBRARY=/usr/lib/x86_64-linux-gnu/libtiff.so.5 \ -DTIFF_INCLUDE_DIR=/usr/include/x86_64-linux-gnu/tiff.h \ -DCURL_LIBRARY=/usr/lib/x86_64-linux-gnu/libcurl.so.4 \ -DCURL_INCLUDE_DIR=/usr/include/curl/ \ -DLIBXML2_LIBRARIES=/usr/lib/x86_64-linux-gnu/libixml.so.2 \ -DLIBXML2_INCLUDE_DIR=/usr/include/libxml2/libxml/ \ -DSDL_INCLUDE_DIR=/usr/include/SDL/ \ -DSDL_LIBRARY=/usr/lib/x86_64-linux-gnu/libSDL.so \ -DJASPER_LIBRARIES=/usr/lib/x86_64-linux-gnu/libjasper.so.1

Not all libraries are set, as I don’t have some of them. Important are the two -fPIC flags for the compiler. I did not set the compilers explicitly, because that causes CMake to “run twice” and in the second run it forgets about all my flags...Can I have a “configure && make && make install” please? *sigh* Okay this allows to start the compilation, but throws a lot of warnings, like this:

CMake Error: CMake can not determine linker language for target: osgdb_serializers_osg CMake Error: Cannot determine link language for target "osgdb_serializers_osg".

When building with this, it stops at about 52%, when trying to compile the “serializers”. Took me a while to figure out, it’s related to the warnings of CMake about “linker language not set” (see above).

#2 Fix CMakeList.txt

We need to tell CMake about which compiler to use for some of the modules. Because some modules don’t contain files and as a result CMake can’t guess which compiler to use(*). Problem is, this will break the compile process. So, to fix this, we need to tell CMake about the file types for these modules. Open up the main CMakeList.txt in the root directory, scroll pretty much to the end - #1245 for OSG 3.37 for me. There is this block:

SET(PKGCONFIG_FILES  openscenegraph  openscenegraph-osg  openscenegraph-osgDB  openscenegraph-osgFX  openscenegraph-osgGA  openscenegraph-osgParticle  openscenegraph-osgSim  openscenegraph-osgText  openscenegraph-osgUtil  openscenegraph-osgTerrain  openscenegraph-osgManipulator  openscenegraph-osgViewer  openscenegraph-osgWidget  openscenegraph-osgShadow  openscenegraph-osgAnimation  openscenegraph-osgVolume )

* for a NON EXISTING file, where there is nothing to compile, how silly is that?

After this block, add these lines to tell CMake about the language of the files mentioned in the warning when running CMake:

SET_TARGET_PROPERTIES(osgdb_serializers_osg PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgutil PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osganimation PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgfx PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgmanipulator PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgparticle PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgsim PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgshadow PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgga PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgterrain PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgtext PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgvolume PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgviewer PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_serializers_osgui PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osg PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgparticle PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osganimation PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgfx PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgsim PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgtext PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgviewer PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgshadow PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgterrain PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgvolume PROPERTIES LINKER_LANGUAGE CXX) SET_TARGET_PROPERTIES(osgdb_deprecated_osgwidget PROPERTIES LINKER_LANGUAGE CXX)

Run the CMake (with all the flags of course) command again, then make. Should hopefuly work. Good Luck!

#3 One problem left

Edith: Well, actually it still breaks at 98% for me.

Linking CXX executable ../../bin/osgviewer ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::WoWVxDisplay' ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::PanoramicSphericalDisplay' ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::SingleScreen' ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::SphericalDisplay' ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::AcrossAllScreens' ../../lib/libosgViewer.so.3.3.7: undefined reference to `vtable for osgViewer::SingleWindow' collect2: error: ld returned 1 exit status applications/osgviewer/CMakeFiles/application_osgviewer.dir/build.make:95: recipe for target 'bin/osgviewer' failed make[2]: *** [bin/osgviewer] Error 1 CMakeFiles/Makefile2:7217: recipe for target 'applications/osgviewer/CMakeFiles/application_osgviewer.dir/all' failed make[1]: *** [applications/osgviewer/CMakeFiles/application_osgviewer.dir/all] Error 2 Makefile:117: recipe for target 'all' failed make: *** [all] Error 2

I hope I can figure this one out as well... So much wasted time... :|

[ultimacodex]

Ultima IX Redemption: (Brief) Update

Ultima IX Redemption: (Brief) Update

Corv has posted an update to the Titans of Ether website, in which he briefly reassures us that development of Ultima IX: Redemption will not be significantly impacted by OpenMW’s transition to OpenSceneGraph:

As you may have read openMW is changing engines from Ogre 2.0 to OpenSceneGraph. This does not affect us in any way… well beside that the engine will run a bit faster.

He also highlights…

View On WordPress

[tulpinspiration-blog-blog]

Latest piece by Stephan Maximilian Huber using OpenSceneGraph and “cefix” comes in the shape of iPad app called Konfetti. A fun little experiment that uses the image captured by the camera and dissolves it into a number of dots that follow the movements in front of the camera, and invite you to play with your mirror image. Additionally, you can intervene the flow of the dots by touching the screen.

[voyager3]

So yes, I've been distracted. I think. Whilst waiting for Xiaohan to port the current basic game to LWJGL I've been checking out scene graph libraries and rendering engines just out of interest. Mainly OpenSceneGraph and OGRE. Computer Graphics is a massive subject and it's really easy to get sucked down the rabbit hole. But on the plus side I'm learning loads and it's heaps of fun. I'm still drawing in between, I've got a ton of pictures I haven't finished (it's getting kind of ridiculous).

[tech-intelligence]

OpenSceneGraph osgAL

OpenSceneGraph Audio Library (osgAL)

osgAL is a toolkit for handling spatial (3D) sound in the OpenSceneGraph rendering library. It utilizes OpenAL++ which is an portable object oriented toolkit ontop of OpenAL. It has been compiled and tested under Windows (.NET2003) and Linux (gcc3.5).

Documentation

API reference

Dependencies

osgAL depends on OpenAL++ and OpenSceneGraph. It has been compiled with OSG 0.9.9. Download and build OpenAL++ and OSG and install header files and library files where the compiler can find them.

Under Windows, you have to setup the INCLUDE, LIB and PATH path, which can be done with the Environment variables

DOS> set INCLUDE=%INCLUDE%;c:\tools\openalpp\include DOS> set LIB=%LIB%;c:\tools\openalpp\lib DOS> set PATH=%PATH%;c:\tools\openalpp\bin

respectively.

Basic Concepts

There are five main classes:

SoundManager

SoundState

SoundNode

SoundRoot

SoundOccluder

SoundState

A SoundState is a small lightweight class that contains a reference to a osgAL::Sample and the settings for a Sample. This class does nothing more than keeping this Sample and its associated attributes together. It can either have a osgAL::SoundSource (usually a limited resources, 32 or more) associated to it. Sometimes it is necessary to allocate a hardware soundsource to a soundstate, for example looping sounds with ambient sound or music.

SoundNode

SoundSource is derived from osg::Node and can be inserted into the scenegraph wherever one wants it to be. During update traversal it will calculate its world position and position the associated SoundState to right orientation and position. No culling is done currently.

SoundManager

The SoundManager is responsible for handling queued SoundStates (for sound events described below) and to store all SoundStates to make it possible to find them later on.

SoundRoot

A node that during cull traversal updates the SoundManager and updates the transformation for the current listener from the current modelView matrix. This could be done manually, but this node makes it all happen automatically during the cull traversal, which reduces the need of inserting code in the viewer run loop.

OccludeCallback

This is a callback class, called during the update of the transformation of the SoundNode. If enabled this callback will shoot a ray from the listener to this SoundNode. If this ray is unoccluded nothing will happen. But if this ray is occluded by some geometry, the gain of the SoundState associated to this node will be reduced by some amount. The functionality of this callback can be extended by inheriting from OccludeCallback and attaching it to the SoundNode.

Sound Events

There is a concept that I call event, for example an explosion is a typical event where a short sound is played once. Another example is the contact sound generated from two colliding objects. When using for example rigid body dynamics, there can be a lot of sound events when objects collides, therefore, the osgAL::SoundManager has a method called pushSoundEvent(osgAL::SoundState *, int priority)

This method takes a SoundState as argument. By making a copy of this SoundState (it uses an internal flyweight pattern to avoid creating new SoundStates on the fly) it builds up a queue of SoundStates. Theese SoundStates are played one by one by the SoundManager during its update() call. This makes it possible to have a lot of SoundStates "playing" when there is a real shortage of hardware sound sources (usually 32 or so).

IO Support

Thanks to a great contribution of Alberto Jaspe, videaLAB, University of La Coruña ([email protected]), osgAL now also support IO. This is easily tested by running one of the sample application, (i.e. osgal) and press 'o' to save the current scene to a file named saved_model.osg. The file saved_model.osg will then also contain the information from osgAL regarding soundnodes, soundstates etc...

This means that scenes containing sound can also be authored through the .osg file format. The best documentation for the file format is to look into an existing file, in the /data subdirectory there are a few sample scenes.

Example

osgal.cpp - Code for testapplication.

osgalmultiple.cpp - Shows dynamic allocation/deallocation of samples.

osgalocclude.cpp - Demonstrates a simple sound occlusion example.

To run the examples:

Change directory to the data sub-directory that contains the bee.wav sample file (data). Start the test application with osgal (make sure you have the path to the dynamic libraries (OSG, Producer, OpenThreads, OpenAL++ and osgAL).

Keybindings

space - Pushes a SoundState as an Event (non-looping). Results in a sound that plays once at the position of the listener. Pressing it repeatedly will add even more SoundStates...

The examples demonstrates the basic functionality of the OSGAL toolkit:

Creating an osgal::Sample (which holds the .wav sample file)

Creating an osgAL::SoundState (which holds a Sample and settings)

Creating an osgAL::SoundNode (which holds a SoundState) and attaching it to a transformation node to make it move.

Creating an osgAL::SoundRoot (which updates the SoundManager and the transformation of the listener according to the modelViewMatrix).

Accessing the osgAL::SoundManager to add SoundStates and pushing SoundStates as events.

Handling occlusions of geometry in the scene

Comments

Direct your comments, bug reports to [email protected]

[tech-intelligence]

Installing OpenSceneGraph and Visual Studio 2010

 Prerequisites:

Download and install MSVS2010 (Express or professional)

Download and install MSVS2010 SP1

Download and install SlikSVN

Download and install CMake

Instructions

Open command window (with administrator priveleges). Type: chdir C:\

svn co http://www.openscenegraph.org/svn/osg/OpenSceneGraph/tags/OpenSceneGraph-3.0.1 OpenSceneGraph

Open CMake gui (with administrator priveleges).

In source box type: C:\OpenSceneGraph3.0.1

In build box type: C:\OpenSceneGraph3.0.1\build

Click Configure (most things will likely go red. it just means they are potential options)

If it goes red, click Configure again.

Click configure until generate button becomes available

You will be asked what IDE tool chain you want to use. Choose Visual Studio 10.

Click Generate

Once everything has been generated exit CMake.

Open Visual Studio

Open the OpenSceneGraph.sln file that CMake has created for you in the c:\OpenSceneGraph3.0.1\build directory

Choose configuration as Debug or Release (the whole procedure should be repeated for both)

Click build

The first time will take about half an hour to an hour to build the project

Once everything has finished building right click on the INSTALL project (about half way down the list) and build that

This will build and write all the correct files to the install directory specified during the CMake stage (we didnt change it in this tutorial so it will be C:\OpenSceneGraph. You can change it before using generate in CMake)

Now add the following enviroment variables at the command prompt

setx OSG_ROOT “c:\OpenSceneGraph”

setx OSG_BIN_PATH  %OSG_ROOT%"\bin"

setx OSG_INCLUDE_PATH %OSG_ROOT%"\include"

setx OSG_LIB_PATH %OSG_ROOT%"\lib"

setx OSG_SAMPLES_PATH %OSG_ROOT%"\share\OpenSceneGraph\bin"

setx PATH  "%PATH%”;”%OSG_BIN_PATH%”;”%OSG_SAMPLES_PATH%"

Notes

If I have made a mistake here then set the variables by right clicking on Computer and going to Properties/Advanced System Settings/ Environment Variables. Add the Variables to the system variables and then change the existing path to include OSG_BIN_PATH and OSG_SAMPLES_PATH

You are now ready to build a project or run an example

Dont forget to add C:\Program files\OpenSceneGraph\include and C:\Program files\OpenSceneGraph\lib when setting your project settings for a new project

The full OSG tutorial upon which all this is based is here.