mapRelative Library Method
Short Description: Map texture relative to current HTML element
Signature: t.mapRelative (s,t[,w,h])
Class: transition Class
Maps a rectangular portion of the Texture Canvas as texture
of the material.
(s,t) specify the coordinates of the top left point of the portion relative to the currently
mapped texture. w is the with and h the height.
mapReleative is very similar to map with the difference that the coordinates (s,t)
are relative to the currently mapped portion.
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