Couple Base, Couple Left, Couple Right
One picture is coupled to another so that one part of the second picture overlaps the first.
These commands are the only commands that can be used to expand a picture in a horizontal direction. They were introduced originally to couple trailers to trucks, but also usable to couple special railway vehicle for heavy loads etc.
It is understood that the contact point in the case of a tractor trailer is the "fifth wheel" or coupling mechanism between tractor and trailer. Because one can combine many different tractors with just as many trailers and the contact point is always the same, it is possible to predefine this point by using the command
Trucks will be extended always on one side, but other picture could be extended on both sides, with different contact points. One can define separate contact points for extending to left by the
After the picture is extended, on the extended side it inherits the contact point distance of the extending picture for possible further extensions. Of course, if the extending picture has different contact point distances by separate
One can also use this command to place loads on vehicles where the load exceeds the horizontal length of the original picture. If one had a load which was so large that it needed to span two or more vehicles (for example, some long steel forms and industrial loads are shipped spanning three flat cars) the vehicle pictures should first be combined using the couple command (in this case the overlap values
One can use this command to stretch the horizontal distance of a vehicle by using this command multiple times. Please remember that the combined vehicle possesses the macros and characteristics of the original picture that serves as the base for the expansion. The overlay vehicles only contribute their pictures, not any of their macros and other characteristics. After processing this modifiers one can place further modifiers in the vehicle macro - but remember, this following macros will use the resulting, extended picture for their coordinate parameters. If a picture is extended to the left, and a following modifier for example wants to place something on the picture by an
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