I've got an invisible wall which is textured in the builder

[martinezz123]

Iv'e made a wall (which should rise up on a trigger).
In the gzdoom builder it looks ok: it is lowered down and textured.
But when I run the gzdoom however, the wall is transparent (but inpassable).
How to fix this error?

[Kappes Buur]

Frankly I have some trouble understanding what you want here.

To me, an invisible wall is just an opening with linedefs set to Block Player.
No textures involved, unless you set a texture with transparency to give a
hint of a wall.

Then, to pass such a wall, you would have to clear the Block Player flag
in a script.

Or do you mean a transparent door?

[martinezz123]

No.
I just made a sector which will open on a trigger elsewhere.
That may be the cause of a problem or I don't know what, but...

The wall should be initially opaque. It IS opaque in the editor but IT IS NOT opaque in the game - before the trigger was activated.
It is creally an error because in the game the wall is transparrent but unpassable - that means it has not been opened.
I'm unable to fix this problem while what I see is a normal opaque wall in the editor.

[Kappes Buur]

Since I do not know how you constructed your map I can only hazard a guess.
Perhaps it is just a matter of where, which section of the wall, you placed the texture.

Read the sections of Linedefs and Sidedefs in The Unofficial WAD Designers' Handbook.

[martinezz123]

Problem solved.
I've changed sector tag for these ambush doors and they went back to a proper possition.