Detailing metal walls
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Detailed metal walls will make any standard room in portal look professional. They are more aesthetically pleasing than a standard repeated tile.
Find the wall you wish to detail. It helps to turn off everything except world geometry.
Cordon off the wall, that way you can move pieces of the wall around quickly and efficiently in 2D.
Resize the main block to 128*128 and then change it's material to the largest metal wall texture.
Duplicate the block and move it around in random places. Make sure they snap to a 32*32 grid to avoid problems later.
Resize a block and re texture it with the medium wall texture. Repeat step 4.
Repeat step 5 for the smallest metal wall texture.
Move some of the blocks back 32 or 64 units and texture the block with white001. This will create the characteristic lighting seen in the chambers. Only use small blocks on the walls, so a player can't jump into it and cheat.
Repeat for each wall.
Once your done with detailing, and putting env_cubemap's near the metal walls. put them 16 units from the wall and put these properties
Property Name Value Cubemap Size 33x32 Brush faces None
start the game, once started Go to Console and type
After The procces is done, go back t console and type these in
mat_reloadallmaterilas and mat_reloadtextures
and you can get the reflecive effect you see in Portal