问OpenGL中加载的对象没有颜色

EN

...main render scene...
glPushMatrix(); 
     glEnable(GL_TEXTURE_2D);  
     glRotatef(90,1,0,0);
     drawModel(teapotModel,"teapot.obj",GLM_NONE|GLM_FLAT); 
     glDisable(GL_TEXTURE_2D);
glPopMatrix();

void drawModel(GLMmodel *pmodel,char*filename,GLuint mode)
{
    if(!pmodel)
    { 
        pmodel=glmReadOBJ(filename); 
        if(!pmodel)
            exit(0); 
        glmUnitize(pmodel); 
        //generate facet normal vectors for model 
        glmFacetNormals(pmodel); 
        //generate vertex normal vectors (called after generating facet normals) 
        glmVertexNormals(pmodel,90.0); 
    } 
    glmDraw(pmodel,mode);
}