Another New Bug

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volt
104 Posts
#6158
Posted Nov 27, 2007
This one found on some video on Youtube which hasn't seen much circulation by my friend NubSawace, who made a video of it.

Any two surfaces that you are able to make portals on (including nodraw) that are in the same plane and separated by less than 32 units, can cause some problems.

This is demonstrated on all of the official maps in this video.

Trying to put a portal_bumper inside the wall does not fix the problem.

A possible workaround is editing your nodraw texture in your Materials directory so that it is not portable. I can't think of a situation where you would need to put a portal on a nodraw texture (if there are, tell me).

Discuss

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Lorithad
240 Posts
#6163
Posted Nov 27, 2007
Replied 38 minutes later
...That's messed up.

I'ma test it out right now.

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Rivid31
152 Posts
#6165
Posted Nov 27, 2007
Replied 15 minutes later
This really doesn't happen on my game at all. :shrug:
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Lorithad
240 Posts
#6166
Posted Nov 27, 2007
Replied 2 minutes later
Yeah, try as I might, I can't reproduce it.
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volt
104 Posts
#6167
Posted Nov 27, 2007
Replied 7 minutes later
Try it at the end of level 13, in the small room at the end.

Turn around and put a portal on the wall that the door is on, against either side wall. then try to put a portal closer to the wall.

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Lorithad
240 Posts
#6168
Posted Nov 27, 2007
Replied 8 minutes later
Yeah, I was able to reproduce it at the end of level 13 like you suggested. That's some messed up shit indeed.
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volt
104 Posts
#6169
Posted Nov 27, 2007
Replied 6 minutes later
It only works if you have two surfaces that are portable (nodraw included!) and within 32 units of each other. From what I have seen, Valve uses 16 unit wide walls for walls that have only one textured surface, 16 unit walls where you see a "thin" door (door_model_reference), and 32 units where you see at "thick" door (door_wide_model_reference).

I'm pretty sure that the ones that NubSawace put in the video includes all of the instances on the official map set where this is possible, that he found.

Try to find a wall that is common to two rooms, and go to the room has less of the shared wall, and try this.

To reproduce this on the floor of Testchamber 15, you could do mat_wireframe 1 (So it will show you the border of the portal), then put a portal on the floor with the long side against the glass. Then shoot the other portal in the gap between the portal's wireframe and the base of the glass.

Enjoy!

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theprogram00
51 Posts
#6171
Posted Nov 27, 2007
Replied 58 minutes later
i found this problem in my map that i'm created that meant you could skip most of a puzzle. I solved it by creating 3 separate brushs, rather than 1 long one. It appears this bug doesn't work over different brushes, but i haven't tested it fully.
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volt
104 Posts
#6174
Posted Nov 27, 2007
Replied 15 minutes later
You could do that, or move one of your walls by a fraction of a unit (by pressing alt) (or does it round to the nearest unit while rendering?)
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youme
937 Posts
#6186
Posted Nov 27, 2007
Replied 6 hours later
Lets face it, portal is full of bugs. All we can really do is point them out so valve can try and fix them.
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volt
104 Posts
#6187
Posted Nov 27, 2007
Replied 26 minutes later
Yeah that's the goal here. Also I wanted to discuss possibly workarounds for said bugs :smile:
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DaMaGepy
361 Posts
#6376
Posted Nov 28, 2007
Replied 1 day later
portals also can be placed on angled surfaces if the angle is not big.
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youme
937 Posts
#6378
Posted Nov 28, 2007
Replied 3 minutes later

gepy wrote:
portals also can be placed on angled surfaces if the angle is not big.

how is that a bug? it is needed for flings in the official game

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Ryanocerous
14 Posts
#6379
Posted Nov 28, 2007
Replied 1 minute later
I noticed this glitch one of the first times I played through Portal. In chamber 15, right before the area most people tunnel through, where you are supposed to fling through the second fizzler to redirect the energy ball, you can shoot a portal on one side of the glass wall, then shoot the other, bumping it to the other side of the wall and bypassing the fizzler completely.
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