what is the black gizmo on the scene?

Support Basics & Interface
1

I use 3 spot lights. The monkey rests in a box with 3 faces deleted and normal flipped.
I donno what is the black thingy in the corner. I have tried subdivided the box, but all is the same. Any hints? Thank you.
http://blog.blogchina.com/upload/2004-11-22/20041122124156474627.png

2

Set your clipend to the end of the cube.

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3

You are right!
I have to extend the clipEnd, although I rotate the scene and find that the line runs across the wall already.
Thanks.