Overview
Normally you can find many instructions to say “Hello World” in OSG style.
It should look like following steps:
1. Create a empty win32 console application.
2. Add OSG lib to project properties
3. Add codes to show a 3D model
4. Compile and run application. OSG HelloWorld for more details check another tutorial. LEARN MORE
Normally codes will be like this:
#ifdef _DEBUG
#pragma comment(lib, "osgViewerd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgd.lib")
#else
#pragma comment(lib, "osgViewer.lib")
#pragma comment(lib, "osgDB.lib")
#pragma comment(lib, "OpenThreads.lib")
#pragma comment(lib, "osg.lib")
#endif
#include <osgviewer/viewer>
#include <osgdb/readfile>
int main()
{
osg::ref_ptr <osgViewer::Viewer> viewer = new osgViewer::Viewer;
viewer->setSceneData(osgDB::readNodeFile("glider.osg"));
return viewer->run();
}Compile Error
if you build the codes above maybe you will get many errors.
Notice
Make sure you are using the same x64 or x86 platform configuration with the build of OSG library, if you build x86 application by including x64 library, you will get a similar error message like below:
fatal error C1083: Cannot open include file: 'osgviewer/viewer': No such file or directory.
and vice versa.
1>------ Build started: Project: test, Configuration: Debug x64 ------
1> main.cpp
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): error C2144: syntax error: 'void' should be preceded by ';'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1158): error C2144: syntax error: 'void' should be preceded by ';'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1158): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1158): error C2086: 'int WINGDIAPI': redefinition
1> c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): note: see declaration of 'WINGDIAPI'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1159): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1159): error C2086: 'int WINGDIAPI': redefinition
1> c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): note: see declaration of 'WINGDIAPI'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1159): error C2146: syntax error: missing ';' before identifier 'GLboolean'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1160): error C2144: syntax error: 'void' should be preceded by ';'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1160): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1160): error C2086: 'int WINGDIAPI': redefinition
1> c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): note: see declaration of 'WINGDIAPI'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1161): error C2144: syntax error: 'void' should be preceded by ';'
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1161): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1161): error C2086: 'int WINGDIAPI': redefinition
1> c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1157): note: see declaration of 'WINGDIAPI'
......
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\um\gl\gl.h(1207): fatal error C1003: error count exceeds 100; stopping compilation
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========for this error MSDN tells us we should include windows.h header. add those lines to above source codes.
#ifdef _DEBUG
#pragma comment(lib, "osgViewerd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgd.lib")
#else
#pragma comment(lib, "osgViewer.lib")
#pragma comment(lib, "osgDB.lib")
#pragma comment(lib, "OpenThreads.lib")
#pragma comment(lib, "osg.lib")
#endif
/***************************** added new lines start *************************************/
#if defined(_WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(_WIN64)
#include <windows.h>
#endif
/******************************** added new lines end *************************************/
#include <osgviewer/viewer>
#include <osgdb/readfile>
int main()
{
osg::ref_ptr <osgViewer::Viewer> viewer = new osgViewer::Viewer;
viewer->setSceneData(osgDB::readNodeFile("glider.osg"));
return viewer->run();
}then we can build successfully.
Runtime Error
Run the program we built just now, maybe we can run it correctly, maybe not, because we may meet following error:
Error “The program cann’t start because zlibd1.dll is missing from your computer. Try reinstalling the program to fix this problem.”
I don’t know why, but the fact is that We can find zlib*.dll files under OSGPATH/bin folder, but we perhaps notice that there is no zlibd1.dll file in that folder, we may get zlib1.dll and zlibd1d.dll instead. zlibd1d.dll is for debug mode, then what we need to do is to copy zlib1.dll to a new name zlibd1.dll, and copy it into windows path:
Information
x86: copy zlibd1.dll to C:\Windows\System32\
x64: copy zlibd1.dll C:\Windows\SysWOW64\
and run above program again. this time we should get glider model displayed on screen.
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