It is hard to judge how far to advance for a peek-a-portal when you're facing directly forwards, so again turn to the side and watch for the color change. Peek-a-portal onto the platform over the fire pit. After pulling back through the blue portal, you will be looking through the portals directly at the fire pit. Practice until you can find this spot reliably. This next one needs to be in a fairly tight area such that you will be able to sight over the platform above the fire pit but under the obstructing end wall of the goo corridor. By keeping the portals low, you can again sight under the partition that blocks the corridor. Repeat again, but this time take more care over the new orange portal placement. Repeat the exact same thing to bypass the next section of the corridor, keeping below the bouncing energy pellet. The corridors are quite long (longer than in Chamber 15), so there is plenty of time to pull this off. low, but clear of the goo, and immediately slide left to emerge from the blue portal before the orange portal moves. Shoot a new orange portal along the corridor to hit the far wall at about the same height, i.e. Turning to the left, slide to the right through the blue portal until the glow around the portal changes to orange, but not far enough to fall out of the orange portal and into the goo. From this portal, you will need to be able to sight underneath the sliding partition that blocks the next section of corridor, but not be so low as to touch the toxic goo and take damage. Place the blue portal on a wall nearby and the orange portal on the far wall to the right of the fixed grating in the corner and somewhat below your present level. Disregard the energy pellet mechanism and advance just until you can see around the corner and along the first section of the corridor above the toxic goo. Place the other portal under your feet as you step out and fall through, getting a boost towards the first room. I'm the new mapper! :D Link - Moddb.Orange portal position for the first peek-a-portal.ДЄs you step out of the chamberlock, place a portal at the other end of the corridor high on the left wall. PS, be sure to check out Portal: Revolution. Have fun! Please give feedback (and credit)! Both of those are also possible with this addon (if you have a model making program). Be advised, that this sign will not flash on like the regular Portal signs unless the user has made a multi-layered texture of the turn on or has applied this texture to a model as multiple skins. Apply the sides to the texture 'NTSC/sign_border'. Extract the 'materials' folder to 'STEAMDIR/steamapps/**username**/portal/portal/*. Add the depth now so that the center is 1 unit in and a frame is left around it. Apply the texture and fit it to your block.

In hammer, create a block in your map that is the same size as the official Portal testchamber signs with no depth. After creation, make a coresponding VMT file and open hammer. When you have the texture you are looking for, save it as an image format that can be read by a VTF creating program for future conversion or as a VTF. This is a large multi-layered picture in pdn (PAINT.NET)/vtf/png (png not layered) format that allows people to create custom testchamber signs for Portal when rearanged and cut correctly.

Portal test chamber signs