[SOLVED] Obj transparency problem

[zielin]

Hello,

I have problem during model loading from obj. I'm using Irrlicht 1.8.
I have tree model, which has leaves created on polygons with textures (TGA). Problem is that around leaves i have white or black 'halo'.

Here is my code:

Code: Select all

 
            scene::IMesh *mesh = m_device->getSceneManager()->getMesh( (m_repoDir + "/" + object.getDirectory() + object.getFileName()).toStdString().c_str());
 
            if (mesh != NULL)
            {
                m_node = m_device->getSceneManager()->addOctreeSceneNode(mesh);
 
                if (m_node != NULL)
                {
                    m_node->setPosition(core::vector3df(m_projectElement->getX(), m_projectElement->getY(), m_projectElement->getZ()));
                    m_node->setMaterialFlag(video::EMF_GOURAUD_SHADING, true);
                    m_node->setMaterialFlag(video::EMF_ANISOTROPIC_FILTER, true);
                    m_node->setMaterialFlag(video::EMF_LIGHTING, false);
                    m_node->setMaterialType(video::EMT_TRANSPARENT_ALPHA_CHANNEL);
 
                    m_node->getMaterial(0).Shininess = 50.0f;
                    m_node->getMaterial(0).EmissiveColor.set(0,200,200,200);
                    m_node->getMaterial(0).DiffuseColor.set(0,200,200,200);
                    m_node->getMaterial(0).AmbientColor.set(0,200,200,200);
                    m_node->setScale(core::vector3df(100, 100, 100));
                }
           }
 

Device and driver initialisation:

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            SIrrlichtCreationParameters params;
            params.Fullscreen = false;
            params.WindowSize = core::dimension2d<u32>(1024, 768);
            params.Stencilbuffer = true;
            params.AntiAlias = true;
            params.LoggingLevel = ELL_INFORMATION;
            params.WithAlphaChannel = true;
            params.Doublebuffer = true;
            params.DriverType = video::EDT_DIRECT3D9;
            params.Stereobuffer = false;
            params.WindowId = widget->winId();
 

And here are texture options after initialization

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    getDriver()->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT, true);
    getDriver()->setTextureCreationFlag(video::ETCF_OPTIMIZED_FOR_QUALITY,true);
    getDriver()->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);
 

The output rendering looks like this:


I don't know what's going wrong. Please help me find error or suggest where I should search for errors.
Thanks.

[hybrid]

Try the same without the octree node, make sure that there is really only one material, and check out the ADD_COLOR material. Also check the material file of your obj mesh, maybe there's some strange and/or unsupported setting included.

[zielin]

As hybrid said, problem was in material but not in model but code. Somewhere deep in function responsible for replacement of models, i've been overwriting material type in something default without information about alpha.
Now I'm using EMT_TRANSPARENT_ALPHA_CHANNEL on loaded model and everything is fine.

Thanks.