[JAVA3D] How to view an object from opposite direction?

[Zhangshi Yin]

Dear Java 3D Experts: My 3d object is in point (0,  0, 0), it seems viewer only look at direction from +z to -z direction, such as (0, 0, 9). Can I look at opposite direction from -z to +z, such as (-9, 0, 0)? If I change viewer to (-9, 0, 0), I cannot see anything. I will appreciate it very much if you tell me how to do it. Thanks. Zhangshi Yin