[Solved] Value mapping
Posted: Tue Mar 21, 2017 12:39 am
If this can already be done, forgive a new user 
I´m exploring QLC daily but haven´t found a solution for this issue.
The fixture in question is a barrel scanner that controls the barrel rotation in an odd way: 0-127 is rotation clockwise from slow to fast and 128-255 counterclockwise from slow to fast. Mapping this to a fader or x/y pad gives me odd results: There is no easy way to have slow clockwise rotation move to slow counterclockwise rotation (bouncing) without seeing high speed in between. It looks bad and puts unnecessary stress on the motors too.
The idea is to create a fader that has no rotation in the middle and fast rotation at its end. This could be done by "flipping" the values of the lower half:
Fader Value 0 = DMX value 127 = fast rotation
Fader Value 1 = DMX value 126
...
Fader Value 126 = DMX value 1 = slow rotation
Fader Value 127 = DMX value 0 = STOP
Fader Value 128 = DMX value 128 = slow rotation
Fader Value 129 = DMX value 129
...
Fader Value 255 = DMX value 255 = fast rotation
It could be done by table mapping of the 255 fader values to 255 DMX values, bit of a hassle to setup, but you don´t do that very often. Or it could be done by assigning a function to the fader, in pseudo syntax: IF (fader <128) THEN (dmx = 127-fader) ELSE (dmx = fader)
I´m exploring QLC daily but haven´t found a solution for this issue. The fixture in question is a barrel scanner that controls the barrel rotation in an odd way: 0-127 is rotation clockwise from slow to fast and 128-255 counterclockwise from slow to fast. Mapping this to a fader or x/y pad gives me odd results: There is no easy way to have slow clockwise rotation move to slow counterclockwise rotation (bouncing) without seeing high speed in between. It looks bad and puts unnecessary stress on the motors too.
The idea is to create a fader that has no rotation in the middle and fast rotation at its end. This could be done by "flipping" the values of the lower half:
Fader Value 0 = DMX value 127 = fast rotation
Fader Value 1 = DMX value 126
...
Fader Value 126 = DMX value 1 = slow rotation
Fader Value 127 = DMX value 0 = STOP
Fader Value 128 = DMX value 128 = slow rotation
Fader Value 129 = DMX value 129
...
Fader Value 255 = DMX value 255 = fast rotation
It could be done by table mapping of the 255 fader values to 255 DMX values, bit of a hassle to setup, but you don´t do that very often. Or it could be done by assigning a function to the fader, in pseudo syntax: IF (fader <128) THEN (dmx = 127-fader) ELSE (dmx = fader)
It may be a good idea to read the manual cover to cover and not just peek into single pages...