好长时间没玩3D桌面了，今天心血来潮想装了玩玩。
以前在ubuntu上玩过。
要安装compiz fusion要加上desktop-effects（layman -a desktop-effects）,然后更新它（layman -S）
然后参考了这里的帖子
现在正在安装中。
安装最新的9999
这是Gentoo Wiki上关于安装Compiz-fusion的文章。
写得挺全的。
主要安装三个部分：compiz-fusion fusion-icon ccsm
1.取消mask
autounmask x11-wm/compiz-fusion-9999
autounmask x11-apps/fusion-icon-9999
autounmask x11-apps/ccsm-9999
2. 然后emerge compiz-fusion fusion-icon ccsm
3.配置xorg.conf支持Desktop Effects
参考
主要参考了这段：
Section “Module”
…
# “dri” and “GLcore” should be commented out or absent
# Load “GLcore”
# Load “dri”
# The “glx” entry should exist as shown:
Load “glx”
…
EndSection
Section “Device”
Option “AddARGBGLXVisuals” “true”
# This option must be either undeclared or
# false, in order to avoid periodic short-term
# freezes on beryl and other OpenGL intensive
# programs
Option “UseEvents” “false”
EndSection
Section “Extensions”
Option “Composite” “enable”
EndSection
4.然后重启X
# xdpyinfo | grep Composite
Composite
# eselect opengl set nvidia
5.然后打开Applications->System Tools->compiz fusion icon.
应该就可以看到效果了。
PS：之前没有修改xorg.conf,就出不了3D效果，所以一定要记得修改xorg.conf文件。
由于是用的git，要从国外网站下载，所以下载速度比较慢，要有点耐心。
附上安装compiz修改后的文件：
附件1：xorg.conf
localhost pjq # cat /etc/X11/xorg.conf
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
RgbPath "/usr/share/X11/rgb"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc/"
FontPath "/usr/share/fonts/TTF/"
FontPath "/usr/share/fonts/OTF"
FontPath "/usr/share/fonts/Type1/"
FontPath "/usr/share/fonts/100dpi/"
FontPath "/usr/share/fonts/75dpi/"
EndSection
Section "Module"
Load "dbe"
# Load "dri"
Load "xtrap"
Load "glx"
Load "record"
Load "extmod"
# Load "GLcore"
Load "type1"
Load "freetype"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "Auto"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
#DisplaySize 340 270 # mm
### Comment all HorizSync and VertRefresh values to use DDC:
Identifier "Monitor0"
VendorName "PHL"
ModelName "Philips 170S"
### Comment all HorizSync and VertRefresh values to use DDC:
HorizSync 31.5 - 64.3
VertRefresh 56.0 - 76.0
Option "DPMS"
EndSection
Section "Device"
Option "AddARGBGLXVisuals" "true"
# This option must be either undeclared or
# false, in order to avoid periodic short-term
# freezes on beryl and other OpenGL intensive
# programs
Option "UseEvents" "false"
### Available Driver options are:-
### Values: : integer, : float, : "True"/"False",
### : "String", : " Hz/kHz/MHz"
### [arg]: arg optional
#Option "SWcursor" # []
#Option "HWcursor" # []
#Option "NoAccel" # []
#Option "ShadowFB" # []
#Option "UseFBDev" # []
#Option "Rotate" # []
#Option "VideoKey" #
#Option "FlatPanel" # []
#Option "FPDither" # []
#Option "CrtcNumber" #
#Option "FPScale" # []
#Option "FPTweak" #
#Option "DualHead" # []
Identifier "Card0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "G70 [GeForce 7600 GS]"
BusID "PCI:6:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "DRI"
Group 0
EndSection
Section "Extensions"
Option "Composite" "enable"
EndSection
附件2：/etc/portage/package.keywords 中关于compiz的部分，由autounmask自动生成。
# ---
# BEGIN: x11-wm/compiz-fusion-9999
# ---
=x11-wm/compiz-fusion-9999 **
=x11-libs/compizconfig-backend-gconf-9999 **
=x11-wm/compiz-9999 **
=x11-libs/libcompizconfig-9999 **
# ---
# END: x11-wm/compiz-fusion-9999
# ---
# ---
# BEGIN: x11-apps/fusion-icon-9999
# ---
=x11-apps/fusion-icon-9999 **
=dev-python/compizconfig-python-9999 **
# ---
# END: x11-apps/fusion-icon-9999
# ---
# ---
# BEGIN: x11-apps/ccsm-9999
# ---
=x11-apps/ccsm-9999 **
# ---
# END: x11-apps/ccsm-9999
# ---