用2.08版本，P3D模式不能使用：
如果用1.5版本，就能正常使用。查了一下说是驱动的问题，但是现在一个能用一个不能用，这是怎么回事？

2.08版其实是非正式的beta版。关于2.0版之后P3D的问题，官网有一个通知，说P2D和P3d在背后已经被OpenGL替代，目前还没有专人维护有关的代码。要稳定还是1.5版。
这是通知原文：
P2D and P3D have been replaced with variants of the OpenGL renderer. We've removed the software-based (but speedy for some circumstances) versions of P2D and P3D. We feel that OpenGL rendering is probably the future for most Processing work, so we're focusing our efforts there. The change will cause some sketches to actually run slower, but the bottom line is that we simply don't have anyone to help maintain all of this extra code. We hope to sort out the performance problems over time—if you see something weird, please report a bug.