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Unity supports triangulated or Quadrangulated polygon meshes. Meshes make up a large part of your 3D worlds. This effect, while it can produce a very convincing representation of 3D geometry, is still limited to the surface of the flat polygons of an object’s mesh The main graphics primitive of Unity. This means that apparent bumps will have their near side (facing the camera) expanded and exaggerated, and their far side (facing away from the camera) will be reduced and seem to be occluded from view. While normal mapping modifies the lighting across the surface of the texture, parallax height mapping goes a step further and actually shifts the areas of the visible surface texture around, to achieve a kind of surface-level occlusion effect. See in Glossary are usually used in conjunction with normalmaps, and often they are used to give extra definition to surfaces where the texture maps are responsible for rendering large bumps and protrusions. Each pixel stores the height difference perpendicular to the face that pixel represents. Heightmaps A greyscale Texture that stores height data for an object. Default compizconfig settings find their way into the global gconf registry when compiz is emerged.Īt src_install() time the compiz ebuild uses the 'update-gconf-defaults' tool to read all files in /usr/share/gconf/defaults/ and write them out to a gconf registry file located in /etc/gconf// It then updates /etc/gconf/2/local-defaults.path to include the new /etc/gconf/ mapping (also known as parallax mapping) is a similar concept to normal mapping, however this technique is more complex - and therefore also more performance-expensive.This is auto started at Xsession startup and actually copies the settings from the global gconf registry to the desktop user's dconf registry. Default compizconfig settings find their way into the desktop user's dconf registry by way of /etc/xdg/autostart/sktop.When compiz starts it checks the value of $COMPIZ_CONFIG_PROFILE and uses the 'ubuntu' entry located in /etc/compizconfig/config This 'ubuntu' entry sets the compiz profile to 'unity' and sets the compizconfig backend to use gsettings (dconf) which reads the compiz settings from the dconf registry. /etc/X11/xinit/xinitrc.d/65compiz_profile-on-session is sourced at Xsession startup and if $DESKTOP_SESSION=unity, it sets the COMPIZ_CONFIG_PROFILE=ubuntu variable.This executes /usr/share/gnome-session/sessions/ssion which starts compiz as the window manager. The display manager (lightdm) or XSESSION=unity and 'startx' uses the sys-apps/upstart desktop services daemon to start 'gnome-session -session=unity'.
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GNOME 3 requires systemd to be running to get it working properly, otherwise, you will get broken power management and multiseat handling, and also some more problems because upstream has moved away from the obsolete consolekit to logind (that needs systemd to be running to work).
Unity 3d wiki upgrade#
Project:GNOME/GNOME3 upgrade guide#Systemd At its core Unity uses a lot of Gnome, and since >=gnome-3.8 systemd is required.