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In the properties of a Brush, under Brush → PolyFlags you can give all surfaces of the brush default properties that override the Surface Flags (UT) in the Surface Properties window.

In PolyFlags you have to enter a number, what follows is a list of the meaning of all the numbers.

To give a brush two or more properties at the same time, you need to make the sum of the numbers of both properties. For example if you want a Translucent + TwoSided brush, you have to use the number 4 + 256 = 260.

After you entered the number you need to rebuild to see the change.

Here's the list. Flags with no effect are left out:

Flag Name Description
0 Default Use settings from Surface Properties for each individual surface of the brush.
1 Invisible All surfaces of the brush are invisible
2 Masked Use for palettized textures to make the first color in the palette (in Paint Shop Pro at least) invisible, see Color Blending
4 Translucent Darker parts of the textur become transparent, see Color Blending
16 Force View Zone
64 Modulated Greyer parts of the texture become transparent, see Color Blending
128 Fake Backdrop Parallax SkyBox visible through surface
256 Two Sided Surfaces display their texture from both sides
512 U-Pan Texture moves in U direction, change speed in ZoneInfo or LevelInfo → ZoneLight
1024 V-Pan Texture moves in V direction, change speed in ZoneInfo or LevelInfo → ZoneLight
2048 No Smooth Square pixels
4096 Special Poly Doesn't do a lot
8192 Small Wavy
32768 Low Shadow Detail Reduces shadow detail; in conjunction with High Shadow Detail (below), makes extra low shadow detail
262144 Dirty Shadows
524288 Bright Corners No dark shadows at the edges of the surface
1048576 Special Lit Surface only gets light from Special Lit lights
2097152 No Bounds Reject
4194304 Unlit Surface ignores lighting and is fullbright
8388608 High Shadow Detail Enhances shadow detail

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