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OpenGL Texturing about the 3ds file loading with OpenGL

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Hi, everyone.
This is a noble problem. I use OpenGL to loader 3ds file which is a helicopter model. And the texture images are also loading correctly. But some textures are displayed normally, some are disappeared. So is there any extra information about the relation between a face and its material? Any ideas will be appreciated. Hope to make myself clear.
Here is my rendering code:

tMaterial *mat;
t3DObject *obj;
int *index;

for (int nOfObj=0; nOfObj<m_pModel->numOfObjects; nOfObj++)
{
obj = &m_pModel->pObject[nOfObj];
for (int nOfFace=0; nOfFace<obj->numOfFaces; nOfFace++)
{
index = obj->pFaces[nOfFace].vertIndex;
mat = &m_pModel->pMaterials[obj->pFaces[nOfFace].matID];
if (mat->isTexMat) // If the corresponding face has texture
{
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, mat->texureId);
glColor3ub(mat->color[0], mat->color[1], mat->color[2]);
// Render the triangles
glBegin(GL_TRIANGLES);
glTexCoord2f(obj->pTexVerts[index[0]].x,obj->pTexVerts[index[0]].y);
glNormal3f(obj->pNormals[index[0]].x,obj->pNormals[index[0]].y,obj->pNormals[index[0]].z);
glVertex3f(obj->pVerts[index[0]].x, obj->pVerts[index[0]].y, obj->pVerts[index[0]].z);

glTexCoord2f(obj->pTexVerts[index[1]].x,obj->pTexVerts[index[1]].y);
glNormal3f(obj->pNormals[index[1]].x,obj->pNormals[index[1]].y,obj->pNormals[index[1]].z);
glVertex3f(obj->pVerts[index[1]].x, obj->pVerts[index[1]].y, obj->pVerts[index[1]].z);

glTexCoord2f(obj->pTexVerts[index[2]].x,obj->pTexVerts[index[2]].y);
glNormal3f(obj->pNormals[index[2]].x,obj->pNormals[index[2]].y,obj->pNormals[index[2]].z);
glVertex3f(obj->pVerts[index[2]].x, obj->pVerts[index[2]].y, obj->pVerts[index[2]].z);
glEnd();
}
else // Has no texture
{
glDisable(GL_TEXTURE_2D);
glColor3ub(mat->color[0], mat->color[1], mat->color[2]);
glBegin(GL_TRIANGLES);
glNormal3f(obj->pNormals[index[0]].x,obj->pNormals[index[0]].y,obj->pNormals[index[0]].z);
glVertex3f(obj->pVerts[index[0]].x, obj->pVerts[index[0]].y, obj->pVerts[index[0]].z);

glNormal3f(obj->pNormals[index[1]].x,obj->pNormals[index[1]].y,obj->pNormals[index[1]].z);
glVertex3f(obj->pVerts[index[1]].x, obj->pVerts[index[1]].y, obj->pVerts[index[1]].z);

glNormal3f(obj->pNormals[index[2]].x,obj->pNormals[index[2]].y,obj->pNormals[index[2]].z);
glVertex3f(obj->pVerts[index[2]].x, obj->pVerts[index[2]].y, obj->pVerts[index[2]].z);
glEnd();
}
}
}



The pointer m_pModel is the helicopter model loaded from a .3ds file.

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I searched google, and found that there was different versions of codes loading 3ds file, but none worked correctly. Their differents mainly lay on the material chunk. One links a material with an object, and another links a material with a face of an object. Any way, they all can't make the all of textures display normally. Any suggestions?
Best Regards.

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I debugged the detail information of the 3ds object returned by Lib3ds loading functions, and found that the faces whose textures hadn't been displayed normally had a bump_map member which was a file name of a image file, so I searched bump mapping in OpenGL , knowing there existed a technique named Bump mapping. Then I applied this technique, but unfortunately, still the texture has not shown. Any one know other causes?
Best Regards
Hu Jingfei

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