You can't. The closest thing you can do to simulate this is to create your door(s) normally, then create a func_weldable that fits in the doorway (and overlaps the door on both sides by a little). If you set the weldable up correctly, you will be able to use the door normally since the weldable will be non-solid until it is welded. When it's welded, it will A. become visible, and B. become solid. If you set the weldable to be breakable when welded, then aliens will be able to break open the weldable, but the doors will still be there and work normally.
Maybe you could make the func_weldable be in the middle, or on the edges, where the door edges would be when its closed (in the middle if its two doors closing, on the bottom if its opening upwards, etc.), as in the spot that was welded shut. You could then have a func_wall_toggle to be the "door" when its closed.
Then, when the aliens kill the weldable, it will be like they just broke the welded part, so the door is still there, but the path is clear. You wouldhave the toggle be trigger when the weldable is made and destroyed, so that it appears and then dies. Or at least I think you can do that
Of course, it would be awkward for the marines to weld a door that opens whenever they approach it... maybe you should think up something else thats cool
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I don't think that is what you would use for a weldable though... you would texture it the way you want it to look once welded shut, I believe.
Then, when the aliens kill the weldable, it will be like they just broke the welded part, so the door is still there, but the path is clear. You wouldhave the toggle be trigger when the weldable is made and destroyed, so that it appears and then dies. Or at least I think you can do that
Of course, it would be awkward for the marines to weld a door that opens whenever they approach it... maybe you should think up something else thats cool
-Jacius