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How can I group all of that into one solid piece?

This Topic viewtopic.php?f=43&t=8550 has it basicaly select all brushes you want then right click func group. Then to select all pieces at once hold alt shift leftclick.

Thank you.

CSG Merge

Soviet wrote:CSG Merge

No clue what that might be xD

Don't let Drofder see!

Merge works when you know what you are doing, CSG was only bad in CoD1 era, they have removed the shitty commands and the good ones work well when you know what you are doing.

Drofder2004 wrote:Merge works when you know what you are doing, CSG was only bad in CoD1 era, they have removed the shitty commands and the good ones work well when you know what you are doing.

Well i don't know what i'm doing really so i'll stick to the first suggestion

No, you cannot merge this anyway. you can only merge two brushes that will in turn form a valid brush.
As brushes cannot have "concave" sections and must have no more than 4 vertexes per face.

What you should really do is clean it up, there are way to many cuts going everywhere.
You should create a terrain patch in a same/similar shape.

Select the FACE of every brush, then "Face to terrain".
The press "v" and then weld all the vertices that are close to each other using "w".
Then finally select all and press "alt-g" to align to grid.

You can also try selecting a patch at a time and joining them by pressing "w" (without vertice mode on).