Legacy:PolyFlags

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 decimal 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, mostly taken from Enum-Polyflags.h:

Bit	Value (dec)	Value (hex)	Name	Description
	0	0x0		Use settings from Surface Properties for each individual surface of the brush.
0	1	0x1	PF_Invisible	Polygon is invisible.
1	2	0x2	PF_Masked	Polygon should be drawn masked. Use for palettized textures to make the first color in the palette (in Paint Shop Pro at least) invisible, see Color Blending.
2	4	0x4	PF_Translucent	Darker parts of the texture become transparent, see Color Blending.
3	8	0x8	PF_NotSolid	Polygon is not solid doesn't block.
4	16	0x10	PF_Environment	Polygon should be drawn environment mapped.
4	16	0x10	PF_ForceViewZone	Force current iViewZone in OccludeBSP (reuse Environment flag).
5	32	0x20	PF_Semisolid	Polygon is semi-solid, collision solid CSG nonsolid.
6	64	0x40	PF_Modulated	Greyer parts of the texture become transparent, see Color Blending.
7	128	0x80	PF_FakeBackdrop	Poly looks exactly like backdrop (parallax SkyBox visible through surface).
8	256	0x100	PF_TwoSided	Poly is visible from both sides.
9	512	0x200	PF_AutoUPan	Automatically pans in U direction; change speed in ZoneInfo or LevelInfo -> ZoneLight.
10	1024	0x400	PF_AutoVPan	Automatically pans in V direction; change speed in ZoneInfo or LevelInfo -> ZoneLight.
11	2048	0x800	PF_NoSmooth	Don't smooth textures.
12	4096	0x1000	PF_BigWavy	Poly has a big wavy pattern in it.
12	4096	0x1000	PF_SpecialPoly	Game-specific poly-level render control (reuse BigWavy flag).
13	8192	0x2000	PF_SmallWavy	Small wavy pattern (for water/enviro reflection).
14	16384	0x4000	PF_Flat	Flat surface.
15	32768	0x8000	PF_LowShadowDetail	Reduces shadow detail; in conjunction with High Shadow Detail (below), makes extra low shadow detail
16	65536	0x10000	PF_NoMerge	Don't merge poly's nodes before lighting when rendering.
17	131072	0x20000	PF_CloudWavy	Polygon appears wavy like clouds.
18	262144	0x40000	PF_DirtyShadows	Dirty shadows.
19	524288	0x80000	PF_BrightCorners	Brighten convex corners; no dark shadows at the edges of the surface.
20	1048576	0x100000	PF_SpecialLit	Surface only gets light from Special Lit lights.
21	2097152	0x200000	PF_Gouraud	Gouraud shaded.
21	2097152	0x200000	PF_NoBoundRejection	Disable bound rejection in OccludeBSP (reuse Gourard flag).
22	4194304	0x400000	PF_Unlit	Surface ignores lighting and is full bright.
23	8388608	0x800000	PF_HighShadowDetail	Enhances shadow detail.
24	16777216	0x1000000	PF_Memorized	Editor: Poly is remembered.
24	16777216	0x1000000	PF_RenderHint	Internal: Rendering optimization hint.
25	33554432	0x2000000	PF_Selected	Editor: Poly is selected.
26	67108864	0x4000000	PF_Portal	Portal between iZones.
27	134217728	0x8000000	PF_Mirrored	Reflective surface.
28	268435456	0x10000000	PF_Highlighted	Editor: Poly is highlighted.
29	536870912	0x20000000		(unused?)
30	1073741824	0x40000000	PF_FlatShaded	FPoly has been split by SplitPolyWithPlane.
30	1073741824	0x40000000	PF_EdProcessed	Internal: FPoly was already processed in editorBuildFPolys.
30	1073741824	0x40000000	PF_RenderFog	Internal: Render with fogmapping.
31	2147483648	0x80000000	PF_EdCut	Internal: FPoly has been split by SplitPolyWithPlane.
31	2147483648	0x80000000	PF_Occlude	Internal: Occludes even if PF_NoOcclude.

Named combinations of flags

PF_NoOcclude =	PF_Translucent | PF_Invisible | PF_Modulated
PF_NoEdit =	PF_Selected | PF_EdProcessed | PF_NoMerge | PF_EdCut
PF_NoImport =	PF_NoMerge | PF_Memorized | PF_Selected | PF_EdProcessed | PF_EdCut
PF_AddLast =	PF_NotSolid
PF_NoAddToBSP =	PF_EdProcessed | PF_Selected | PF_Memorized
PF_NoShadows =	PF_Invisible | PF_Environment | PF_FakeBackdrop
PF_Transient =	PF_Highlighted