Sphere ViewController.mm

// Create a single sphere, with texture
- (void)setupTexturedSphere
{
    // We need an earth texture
    NSError *error = nil;
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"NaturalEarth" ofType:@"tif"];
    texture = [GLKTextureLoader textureWithContentsOfFile:filePath options:nil error:&error];
    
    // A single cube, centered at the origin
    float origin[3] = {0,0.5,0};
    float size[3] = {0.5,0.5,0.5};
    FlexiVertexBuffer *flexiBuffer = [[FlexiVertexBuffer alloc] init];
    [flexiBuffer addSphereAt:origin sized:size];
    
    // If we got a valid texture, we'll use that
    // This works because there's only the one.
    if (texture)
    {
        self.effect.texture2d0.envMode = GLKTextureEnvModeModulate;
        self.effect.light0.diffuseColor = GLKVector4Make(1.0f, 1.0f, 1.0f, 1.0f);
        self.effect.texture2d0.target = GLKTextureTarget2D;
        self.effect.texture2d0.name = texture.name;
    }
    
    SimpleGLObject *glObject = [flexiBuffer makeSimpleGLObject];
    [_glObjects addObject:glObject];    
}