when i first inst Photoshop cs6 i was able to see the 3D icon, but on the next time i used the program there is no more 3D icon. when i launch Photoshop it say " Photoshop detected graphic hardware is not officially supported if you experience problem please unchecked the use graphic processor check box in the performance panel of the preference dialog" Is this the cause? If so how to uncheck that box? Thanks
Photoshop CS6 only has 3D features in the extended version, and requires a minimum of 512 Meg VRAM on your video card.
And have you updated your video card driver from the GPU maker's website to pick up all the bug fixes?
Unchecking the GPU checkbox will disable all GPU features in Photoshop, including 3D.