[fixed] Bug in new OBJ-loader-code of Irrlicht 1.1

[jettitore]

Hi all,

I've changed from Irrlicht 1.0 to Irrlicht 1.1, but now my programm does not work anymore. (it still compiles) Everytime I try to call GetMesh-Function an access violation occurs. (Attempted to read or write protected memory. This is often an indication that other memory is corrupt.)

In Irrlicht 1.0 this code worked perfectly, but now the GetMesh("path")-Function causes this error. (but only when loading obj-files)

Code: Select all

IMesh mesh = smgr.GetMesh(path_wall).GetMesh(0);

I'm using Visual Studion .NET 2005, Windows XP, DirectX9, (now) Irrlicht 1.1 and I'm using C#.

I hope somebody knows a workaround for my problem. Thanks.

jettitore

[rogerborg]

Did the 1.0 interfaces return references? The 1.1 interfaces return pointers, and so that code should be:

Code: Select all

(assuming 
scene::ISceneManager* smgr = device->getSceneManager();)

IMesh * mesh = smgr->GetMesh(path_wall)->GetMesh(0); 

With validity checking omitted for brevity.

[jettitore]

Did the 1.0 interfaces return references? The 1.1 interfaces return pointers,

Ehm, no. I've found out that my md2-files are causing no access-violation, but loading obj-files causes a access-violation-exception. Maybe the improved obj-loader has a bug? Is there although a solution to load my obj-files? Thanks for your help.

jettitore

[rogerborg]

Oh, hang on, is your application written in C#?

[jettitore]

Oh, hang on, is your application written in C#?

Oh sorry, that i didn't mention this. Yes it is written in c# and it worked fine with irrlicht 1.0. But the, in the change-log described, better obj-loader-code causes now access-violations. But I see no way to fix this. Is there maybe any tool that can convert my obj-files to obj-files that are conform with irrlicht 1.1?

Thanks.
jettitore

[loonychewy]

Are you able to debug the engine and see which part of the mesh loader it crashes in, or are you able to post your obj model somewhere for us to test?
By right the loader should load any obj files without any specific restrictions.

[jettitore]

Are you able to debug the engine and see which part of the mesh loader it crashes in, or are you able to post your obj model somewhere for us to test?
By right the loader should load any obj files without any specific restrictions.

The old loader of Irrlicht 1.0 was able to load my Obj-Files. Unfortunately I'm not able to debug the buggy Irrlichtcode, but here is a link to the Obj-File that causes Irrlicht to crash. (It's a simple cube)

The Obj-File was created by Maya 7.0.

Thank you for your help.
jettitore

[bitplane]

this is working in svn, i suspect it's because the mtl file was referenced but could not be found.
try placing the mtl file in the same folder as the mesh, or grab the latest code from svn

[jettitore]

this is working in svn, i suspect it's because the mtl file was referenced but could not be found.
try placing the mtl file in the same folder as the mesh, or grab the latest code from svn

Yes it works now. Thank you for your help.

But btw: what is the MTL-file good for? I've resaved the obj-file with another programm and this new obj-file works flawless without a MTL-file, why?

jettitore

[bitplane]

mtl files contain information about the materials that the meshes in the obj file use, i guess some exporters will not have a "usemtl" line in the obj file if the default materials are used.
you could also delete this line from your file in notepad if you don't want to use one.

[jettitore]

ah okay.

Then once again, thanks for the help.

jettitore