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Mapping Help
This is the place to ask about mapping problems, techniques, and bug fixing, and pretty much anything else you want to do in the level editor.

For questions about coding, check out the Coding Help thread: https://www.celephais.net/board/view_thread.php?id=60097
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More "newbie" Stuff 
Is there a way of making a secret door retract into a wall, and then go upwards? Or am I stuck with a handful of cardinal directions? 
That's What Secret Doors Do 
AFAIK 
Hm 

flags
"open_once" once open, stays open
"1st_left" first move is left of arrow
"1st_down" first move is down from arrow
"no_shoot" only opened by trigger
"always_shoot" even if targeted, keep shootable


Maybe a negative lip allows you to reverse the first left / first down directions.

Never played with them much to be honest. 
Better Info 
 
I needed a door to use as a long, extending walkway. I needed it to slide out about 256 units, then up 16 units. I thought I could do it with a secret door somehow but I never could get it to cooperate. I ended up just using a func_train and used a little door hidden in the floor to provide the sound.

As far as I could tell they only go bang and pop open then slide in whatever direction they're set for. I always meant to go back and experiment with them some more but haven't got around to it yet. 
Yet Another Newbie Question 
Suddenly my map does not want to compile anymore (I've been compiling and testing every so often until now) and I get the following error message:

LinkConvexFaces: Mixed face contents in leafnode

Clearly I've broken something, but I don't know what. Can someone explain? 
 
Don't mix normal textures with liquid/sky textures on your brushes. 
Also 
don't have liquid brushes and sky brushes touching. 
It Was # 2 
I had a teleporter brush and a sky brush touching. Thanks so much! 
Light Question 
What to do with black washed out vertices that are placed on grid
 
You'll have to redo the brushes or get them back on the grid properly.

I had this problem with the rockwork in q-deck, I ended up redoing that area about 3 times. Every time I opened up the map the vertices would degenerate until they started looking like your screenshot. 
Best Advice I Ever Had 
bind "snap to grid" to the space bar and every time you mess about with the vertex tool hit space. It has saved me a hell of a lot of trouble.

That is if you're using Trenchbroom, and also make sure you enable force integer plane points. 
 
I needed a door to use as a long, extending walkway. I needed it to slide out about 256 units, then up 16 units. I thought I could do it with a secret door somehow but I never could get it to cooperate. I ended up just using a func_train and used a little door hidden in the floor to provide the sound.

e4m1 actually has this too. i think that that is the one thing a secret door can't do. 
I Suck 
it's e2m1. 
Force Integer 
Means you won't have to do it by hand (spacebar), unless you've already created so many degenerate brushes that you crash the editor when trying to do a global snap to grid.

But you guys won't be anywhere near that yet. 
Well How About That 
I once snapped a perfectly fine brush to grid and it offset it by about 0.00403434 units 
Ijed 
that's not true, I force integer plane points and get off-grid vertices all the damn time if I don't also snap to grid.

OTP,
TB can be a little temperamental. Sometimes I mash the force to grid key a bunch of times just to make it "stick". I'm sure I'm being superstitious with that though.

Sometimes I will end up with a random leak after a while in a map to find that a brush that caused me no trouble before has suddenly degenerated and become off grid. It's not too often this happens now but I haven't tried to make any crazy terrain in a while.

My advice is make complex terrain as your last thing. 
#13903 
I knew the force-to-grid advice would follow.
Reason I asked after they already were. 
 
when you clip a brush at lots of wacky angles, often the editor can't snap all the verts to the grid, because to snap one means slightly altering the angle of a plane to accommodate it, which would move several other verts by a different amount. this is because the verts don't determine where the planes are, the planes determine where the verts are by their intersections.

build your rocks and terrain out of brushes that are more ... brushy. make sure you clip them at integer ratio angles so that the planes always intersect at points that have a chance of being on the grid in the first place :) 
 
I always just use brushes that have triangle faces and move the vertexes as needed keeping them on grid. I almost never use clipping. 
Editors Lie 
Thanks Lun for your explanation.

I just saw the brushfaces slowly change in the editor and started again untill I had the right one.
Then, while mapping on, the sides became louzy, although I hadn't changed anything.
So going back to the right map slowed awfully down.
Now all brushes that stand on grid in editor start blacking out.

So editor snaps all verts untill I believe they do and then start degenerating.

@Ricky- all brushes in the screenshot are triangles that have moved vertexes, but they start telling lies. 
 
Wouldn't anglesense help here? 
Worth A Try. 
When I compile the map without light there's just a smooth surface,
so the error isn't the misfitting brush.
I could try anglesense, but there are many parts here so many extra lights.
Replacing them with brushes for light sense I never encounterd. 
 
what about making the entire hill a func_wall? 
@RingofQuaddamage 
those are some good tips sock, but how am I supposed to learn how to do lighting properly?

I would recommend you find a map you like the look of (light wise) and then check out the source map file to see how it was done. Break the example map down into a small sections with light entities and gradually remove the lights one by one until you see what difference it makes.

Learning lighting for old BSP compile engines is the most time consuming thing because it involved compiling and waiting for the results. The best advice is start with lots of small test maps and try to find some good source map examples. 
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