Bulge

The Bulge texture procedure was inspired by looking at windows on a skyscraper. If a building was pumped full of air, the glass would bulge outwards in the center while the edges would be constrained by the frame. The frame of the window is exactly the same as a grid that is apparent when using the bulge texture.

The Bulge texture procedure is most commonly applied as a bump map to create a bulge effect on a surface. However, it can also be applied to a transparency map to simulate windows that are dirty or opaque around the edges but transparent in the middle area. When applied to a color map, there is no apparent bulge, but this application can be used to simulate tile effects, for example.

Argument Name	Absolute Range	Useful Range	Default	Description
uwidth	0.0, 1.0	0, 1	0.1	Width in u dir. of constant stripe
vwidth	0.0, 1.0	0, 1	0.1	Width in v dir. of constant stripe
urepeat	-infinity, infinity	-10.0, 10.0	1.0	# of copies in u dir. within coverage area.
vrepeat	-infinity, infinity	-10.0, 10.0	1.0	# of copies in v dir. within coverage area.
uoffset	-infinity, infinity	-1.0, 1.0	0.0	U offset repeat within coverage area
voffset	-infinity, infinity	-1.0, 1.0	0.0	V offset repeat within coverage area
ucoverage	-infinity, infinity	0.0, 1.0	1.0	amount of U surface to be textured
vcoverage	-infinity, infinity	0.0, 1.0	1.0	amount of V surface to be textured
utranslate	-infinity, infinity	-1.0, 1.0	0.0	amount of U coverage area to be moved.
vtranslate	-infinity, infinity	-1.0, 1.0	0.0	amount of V coverage area to be moved.
uwrap	TRUE FALSE		TRUE	flag to wrap texture around U boundaries of coverage area.
vwrap	TRUE FALSE		TRUE	flag to wrap texture around U boundaries of coverage area.
worldspace	TRUE FALSE		FALSE	flag to use world space texture mapping
rotate	-infinity, infinity	-360.0, 360.0	0.0	angle coverage area to be rotated
mirror	TRUE FALSE		FALSE	flag to match edges of texture