我正试图从Blender中完成一个猴头的example on the Kivy website that shows how to display a 3D obj file。我能够让他们的源代码运行没有错误（只在输出中获得Info行）但是当渲染器出现时，窗口是空白的（只有黑色背景）。我检查确保在出口前我在Blender中选择了猴头。有谁知道可能导致这种情况的原因？
（从python shell添加printout）
[INFO ] [Logger ] Record log in C:\Users\Edward\.kivy\logs\kivy_16-05-02_2.txt
[INFO ] [Kivy ] v1.9.1
[INFO ] [Python ] v2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:32:19) [MSC v.1500 32 bit (Intel)]
[INFO ] [Factory ] 179 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO ] [OSC ] using <thread> for socket
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] OpenGL version <4.0.0 - Build 10.18.10.4276>
[INFO ] [GL ] OpenGL vendor <Intel>
[INFO ] [GL ] OpenGL renderer <Intel(R) HD Graphics>
[INFO ] [GL ] OpenGL parsed version: 4, 0
[INFO ] [GL ] Shading version <4.00 - Build 10.18.10.4276>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <16>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [Shader ] Read <simple.glsl>
[INFO ] [Base ] Start application main loop