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Texture Coordinates

Texture coordinates define how an image (or portion of an image) gets mapped to a geometry. A texture coordinate is associated with each vertex on the geometry, and it indicates what point within the texture image should be mapped to that vertex.

fme_texture_coordinate_x
fme_texture_coordinate_y
fme_texture_coordinate_z

Additional Reference:

http://www.gamedev.net/reference/articles/article947.asp

Set on the (enhanced) geometry using named measures called fme_texture_coordinate_[x|y|z]

Domain: each coordinate within the texture image is between (0.0, 1.0), but coordinates outside the texture can be specified so effectively the domain is all real numbers
0,0 is the lower left