cairo-dock in 3D

[dyyyy]

hi i've seen in all the examples and in the themes of cairo that it's in 3D
why on my PC it's only in 2D whatever the theme that i choose,
is there something in the configuration i should change?

[fabounet]

activate the rendering plug-in (install it if needed)

[ellalan]

Where can I activate rendering plugin? My apologies for barging in.

[fabounet]

install plug-ins from the official repository (purge Cairo-Dock before)