Dome with surface how to

hi…

i am searching a way to do a dome, and i have tried a spheerical spred with a factor of 0.5, but it is not fine because the dome will be a surferce of a texture, so it is not define well.

there is a node like homografy, throught with i can modificate a quad to do a dome? or an other usefull way?

thanks…

https://discourse.vvvv.org/t/10690