Reproductible on Windows and Linux:
If the TLP_DIR is set, but with a bad path, nothing is done to verify that the path is valid when initializing tulip.
In consequence, when we have a GLscene that will be drawn:
1. a GLNode is created.
2. In this GlNode, a GlLabel is created.
3. In its constructor, is called the initialization. And the initialization uses TulipBitmapDir + "font.ttf", that is created from TLP_DIR
4. No check is made to verify that the font is created correctly by ftgl.
5. Next, always in GlLabel::init(), is called font->FaceSize(fontSize);
But if the file is not found, we obtain an error at: FTSize.cpp:49: face is NULL but no test on it is made.
It result in the access of a bad memory place, and will crash the application.
Nothing in release permits to detect this problem. And in debug, it takes several times to find it.
It would be usefull:
1. to check that TLP_DIR is a valid path, containing all necessary files used by tulip
2. to check when using a file, that this file is valid, or to check that the object loading the file is valid