Hollow - Reasons NOT to use it...

Asterix · Post by **Asterix** » Fri Dec 05, 2003 6:46 pm

Everyone says: do not use the hollow command. I can see the reasons for not using it when building rooms (you need individual sides for making doors, windows, etc)... What about the sky box? Isn't this the only situation that is perfect for using the hollow command? Please advise... Thx.

m4rine · Post by **m4rine** » Fri Dec 05, 2003 7:43 pm

mm..... what about modifiying your skybox? I think non hollowed are supposed to be easier to manipulate. Or what if you wanted to add something, like a sticky out bit especially for a building or something?

tltrude · Post by **tltrude** » Fri Dec 05, 2003 8:16 pm

I use csg hollow all the time. You just have to learn how to use it. It does overlap the brushes it creates. If you know that, you can adjust the brushes, or use csg subtract, or the cutter, to fix them.
Ok, lets say you want to make an 8 sided pipe. First you create a solid eight sided brush (make it 128x128x256). Then you pick a grid size that will be the thickness of the pipe walls--say key 3. Now, with it selected, hollow it out. You will end up with 8 overlapping brushes and two end brushes. Delete or move the end brushes. Then select every other brush (four of them in all) and use csg subtract. Now your pipe is done and can be moved/rotated to where you need it.

Making a pipe with more sides, or thicker walls, may be harder but, with some practice, not imposible. Note: do not rotate or resize the brushes before you fix the overlaps--big mess.

Hope that helps!

omniscient · Post by **omniscient** » Sat Dec 06, 2003 4:45 pm

where is csg substract. the only bad thisa bout hollowing is the overlapping bruses. if overlapping doesnt matter (skybox) then its fine.

Desert Eagle · Post by **Desert Eagle** » Sun Dec 07, 2003 6:11 pm

If you are careful and take your time the CSG subtract and hollow are very useful tools. The key is to have alot of memory in your pc and take your time, check your work and fix any problem brushes. I use it often without any problems

omniscient · Post by **omniscient** » Sun Dec 07, 2003 10:28 pm

what does csgsubstract do? i hollow a box and click it, but it doesnt do anyhting

wacko · Post by **wacko** » Sun Dec 07, 2003 10:52 pm

CSG Substract substracts the selected brush from overlapping ones and then deletes the selected one.
This can be handy, but also can result (when working with irregular brushes) respectively will (when substracting from terrain) in radiant crashing.
So, when u want to use it, save ur map

Safer but less comfortable is the clipper tool, where btw you can specify where the cuts will be while u're cutting, and won't have to clean up your brushes afterwards.
Nevertheless, for e.g. cutting a smaller cylinder out of a bigger one, i use CSG Substract, then set everything back on the grid and finally do the cutting lines the way they ought to be.

tltrude · Post by **tltrude** » Mon Dec 08, 2003 2:49 am

Sorry, wacko, but the selected brush does not get deleted automattically. It just cuts up the overlapping brushes and subtracts the parts that are inside the selected brush.

To use it for a hollowed out skybox. Select only the top and bottom brushes. Then hit csg subtract--the overlaping parts of the walls will vanish. Then select two opposite wall brushes and do it again. The overlapping parts of the walls will vanish, and yer done.

wacko · Post by **wacko** » Mon Dec 08, 2003 8:27 am

tom, u're right. don't know why i said so. will try to get more sleep...

omniscient · Post by **omniscient** » Wed Dec 10, 2003 12:51 am

ah i get it, that is one dam cool button. ill use that more often.

Gen Cobra · Post by **Gen Cobra** » Wed Dec 10, 2003 4:39 pm

cg subtract is the devil.

omniscient · Post by **omniscient** » Thu Dec 11, 2003 1:22 am

why would u call it the devil?