Muscles and planes in f1 
Submitted by PioM on Mon, 2011-08-08 09:11

When I used rr for normal plane of bending before bending muscle ([|-1:180]), in the body preview the square was rotated by 90 degrees, but in the world the muscle was bended without previous rotation in plane (rr was deleted?)

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Submitted by Szymon Ulatowski on Sun, 2011-11-13 16:48

It seems that "rr" does not apply to the muscles on the segment immediately after the modifier.
Consider this simple "Y" with a bending leg:

X(X,XX[|])

We expect that placing "rr" before the last X should rotate the bending axis, especially that the muscle symbol in the structure viewer rotates as we add r's:

X(X,XrrX[|])

...but in fact it will not work that way; it will still bend "left-right" instead of "up-down". In this case the muscle simply works as if it was attached to the previous X, so if we want to rotate it, we must place "rr" before XX:

X(X,rrXX[|])

Note that the "rr" in the second example was not ignored/deleted: it only influenced the last X, which had no visible effect in this case (but would be more noticeable if there was some structure after the X).

This behavior is more a feature than a bug, but the discrepancy between the structure display and the real muscle axis is definitely a bug. Thanks for drawing our attention to this issue!