Overlay textures

General

Edge textures render on top of walls, 3D floors, or polyobjects. They can be offset and scaled independently. They may also wrap, like a middle texture, and may extend past the wall's boundaries.

Each two-sided wall has up to four edge textures: top upper, top lower, bottom upper, and bottom lower. Their names are indicative of which part of the wall they snap to:

• top upper edges begin rendering from the top of the upper wall;
• top lower edges snap to the bottom of the upper wall;
• bottom upper edges begin rendering from the top of the lower wall;
• bottom lower edges snap to the bottom of the lower wall.

One-sided walls - which 3D floor sides and polyobject sides are considered to be in these contexts - have up to two edge textures: top upper and bottom lower.

UDMF

Changes to the UDMF specification.

Added to sides

Field	Description
edge_top_upper_texture	Top edge texture of the upper wall. Default = "-".
edge_top_upper_offsetx	X offset for the top edge of the upper wall. Default = 0.0.
edge_top_upper_offsety	Y offset for the top edge of the upper wall. Default = 0.0.
edge_top_upper_scalex	X scale for the top edge of the upper wall. Default = 1.0.
edge_top_upper_scaley	Y scale for the top edge of the upper wall. Default = 1.0.
edge_top_upper_alpha	Alpha for the top edge of the upper wall. Default = 1.0.
edge_top_upper_renderstyle	Render style for the top edge of the upper wall. Default = "translucent".
edge_top_upper_noskew	Disables skewing of the top edge of the upper wall.
edge_top_upper_noclip	Top edge texture extends outside the upper wall (displays like a mid texture.)
edge_top_upper_wrap	Top edge texture of the upper wall wraps.
edge_top_lower_texture	Bottom edge texture of the upper wall. Default = "-".
edge_top_lower_offsetx	X offset for the bottom edge of the upper wall. Default = 0.0.
edge_top_lower_offsety	Y offset for the bottom edge of the upper wall. Default = 0.0.
edge_top_lower_scalex	X scale for the bottom edge of the upper wall. Default = 1.0.
edge_top_lower_scaley	Y scale for the bottom edge of the upper wall. Default = 1.0.
edge_top_lower_alpha	Alpha for the bottom edge of the upper wall. Default = 1.0.
edge_top_lower_renderstyle	Render style for the bottom edge of the upper wall. Default = "translucent".
edge_top_lower_noskew	Disables skewing of the bottom edge of the upper wall.
edge_top_lower_noclip	Bottom edge texture extends outside the upper wall (displays like a mid texture.)
edge_top_lower_wrap	Bottom edge texture of the upper wall wraps.
edge_bottom_upper_texture	Top edge texture of the lower wall. Default = "-".
edge_bottom_upper_offsetx	X offset for the top edge of the lower wall. Default = 0.0.
edge_bottom_upper_offsety	Y offset for the top edge of the lower wall. Default = 0.0.
edge_bottom_upper_scalex	X scale for the top edge of the lower wall. Default = 1.0.
edge_bottom_upper_scaley	Y scale for the top edge of the lower wall. Default = 1.0.
edge_bottom_upper_alpha	Alpha for the top edge of the lower wall. Default = 1.0.
edge_bottom_upper_renderstyle	Render style for the top edge of the lower wall. Default = "translucent".
edge_bottom_upper_noskew	Disables skewing of the top edge of the lower wall.
edge_bottom_upper_noclip	Top edge texture extends outside the lower wall (displays like a mid texture.)
edge_bottom_upper_wrap	Top edge texture of the lower wall wraps.
edge_bottom_lower_texture	Bottom edge texture of the lower wall. Default = "-".
edge_bottom_lower_offsetx	X offset for the bottom edge of the lower wall. Default = 0.0.
edge_bottom_lower_offsety	Y offset for the bottom edge of the lower wall. Default = 0.0.
edge_bottom_lower_scalex	X scale for the bottom edge of the lower wall. Default = 1.0.
edge_bottom_lower_scaley	Y scale for the bottom edge of the lower wall. Default = 1.0.
edge_bottom_lower_alpha	Alpha for the bottom edge of the lower wall. Default = 1.0.
edge_bottom_lower_renderstyle	Render style for the bottom edge of the lower wall. Default = "translucent".
edge_bottom_lower_noskew	Disables skewing of the bottom edge of the lower wall.
edge_bottom_lower_noclip	Bottom edge texture extends outside the lower wall (displays like a mid texture.)
edge_bottom_lower_wrap	Bottom edge texture of the lower wall wraps.
clipmidtex	Side's mid textures are clipped to floor and ceiling.
wrapmidtex	Side's mid textures are wrapped.

Added to lines

Field	Description
clipmidtex	Side's mid textures are clipped to floor and ceiling.

Lua

Changes to the Lua API.

Added to sides

Field	Description
edge_top_upper	The side_t.overlay of the top edge of the upper wall.
edge_top_lower	The side_t.overlay of the bottom edge of the upper wall.
edge_bottom_upper	The side_t.overlay of the top edge of the lower wall.
edge_bottom_lower	The side_t.overlay of the bottom edge of the lower wall.
clipmidtex	Whether the middle texture is clipped to the ceiling and the floor of the sector.
wrapmidtex	Whether the middle texture wraps.

side_t.overlay

Field	Description
valid	Is the overlay valid?
texture	Texture number.
offsetx	X offset.
offsety	Y offset.
scalex	X scale.
scaley	Y scale.
alpha	Alpha.
blendmode	Render style.
noskew	Overlay doesn't skew against wall.
noclip	Overlay doesn't clip against wall boundaries.
wrap	Overlay wraps.