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Which orientation do you position fixtures and why doesn't MA3d match reality with Pan & Tilt?

Ive also made a video tutorial on Pan and Tilt in MA3d here (2 parts)

Understanding the basic concepts is important for more reliable results.
You should not have to invert pans and tilts at the gig when you load your show. Doing so breaks the link between real and 3d.

The Basics
MA3d treats all 3d model fixtures the same way and assumes all fixtures Pan & Tilt the same way unless told otherwise in the fixture library
As of MA3d V3.1.1 they have changed the standard coordinates of a fixture to the below.
A fixture with 0 rotations on x,y & z axis,  we assume is a fixture hanging with head down and with the front towards you

With the default settings in most fixture libraries (and also ma3d default) turning the encoders results in the following (in 3d only)
Tilt - turning the encoder clockwise (positive values) tilts the head away from you
Pan - turning the encoder clockwise (positive values) pans the yoke clockwise
This would be fine if all fixtures moved that way, but they don't. Different manufacturers use different directions and even different models with a manufacturer can have different directions and home positions.

We need to adjust the fixture library

For example: most martin fixtures tilt away from you and pan anticlockwise, most robe fixtures tilt towards you and pan clockwise, that means default pan settings are wrong for most martin fixtures and the default tilt settings are wrong for most robe.
You could rotate the robe fixtures 180 degrees on the z axis and it should now show correctly, but I would recommend you don’t as when doing shows with different fixtures it could become confusing with different rotation settings for different fixtures

Best practice is we need to fix this in the MA2 fixture library to have 3d match reality.
Inverting DMX on Pans and Tilts in the patch window or on fixture type page does not work. Nor does Invert encoders in the patch window. More on these options later.
To do this we need to go into the physical pan and tilt options and change some simple settings.

So lets look at a couple examples:
e.g.: Mac 700 - patch some Mac700 (I'm presuming you know how) then
turn off any pan and tilt inversions or encoder inversions (if an old showfile) in the patch
SETUP - PATCH & FIXTURE SCHEDULE - FIXTURE TYPES (This will open the fixture types window of fixtures in your showfile)
select the Mac700 Profile line
EDIT (This will open the main module for the Mac700 Profile)
scroll to and select the pan line
EDIT ROW (This will open the functions page for the pan channel of the mac 700)
there are 3 main sets of values
From & To (this is value we see on the encoders usually in degrees -
A fixture with 540deg of pan will usually be From -270 & To 270
From DMX & To DMX (this is the DMX values associated with the channel
From Phys & To Phys (THESE ARE THE VALUES ASSOCIATED WITH MA3D)
Default would usually be From Phys -270 & To Phys 270 ( rotates clockwise in 3d)
As we know that a mac 700 pans anti-clockwise we need to change the from phys and to phys
Right Click the From Phys value
type 270 and ENTER
Right Click the To Phys value
type -270 and ENTER
this has now reversed the way your mac 700 pans in 3d only and should hopefully match reality. It does not affect the way anything works in reality
Now exit this window.
We know a mac 700 tilts away from us (which is the default direction in MA 3d) so we don't need to change anything in tilt
Exit all windows and save changes. Note this only changes the fixture settings in your showfile. Not in the main fixture library

eg2 - Robin600 - patch some Robin600, turn off inversions as above.
We know a Robin 600 tilts towards us and pans clockwise in reality, so we should only have to flip the values in the physical settings in the tilt channel
SETUP - PATCH & FIXTURE SCHEDULE - FIXTURE TYPES (This will open the fixture types window of fixtures in your showfile)
select the Robin 600 Profile line
EDIT (This will open the main module for the Robin 600)
scroll to and select the tilt line
EDIT ROW (This will open the functions page for the tilt channel)
From Phys & To Phys (THESE ARE THE VALUES ASSOCIATED WITH MA3D)
For 300 deg tilt Default would usually be From Phys -150 & To Phys 150 ( tilts away in 3d)
As we know that a robin 600 tilts towards us we need to change the from phys and to phys in tilt
Right Click the From Phys value
type 150 and ENTER
Right Click the To Phys value
type -150 and ENTER
this has now reversed the way your robin 600 tilts in 3d only and should hopefully match reality.
Now exit all windows and save

I have created a spreadsheet with some value changes needed for some fixtures. I can’t guarantee these are all correct as I don't have access to all fixtures I've listed, some are assumptions from manuals. This also has some other fixture information I've collected too

Now that your fixtures pan and tilt the right way, what rotate settings do we use in fixture positioning?
As mentioned above we consider a fixture with 0,0,0 on xyz will be a hung fixture facing forward.
For any fixtures on floor you should rotate the y axis 180 degrees so that would be 0,180,0
If you want to face your fixtures inwards or other you may need to rotate z axis 90 degrees or other to suit your setup.
All the models available to purchase in my 3d model pack have arrows to easily identify orientation of fixtures

Also note that some fixture libraries have incorrect values for pan and tilt degrees,

For example a mac 101 fixture library phys values for pan are listed as -215 - 215 (430 degrees) where the manual has it as (540 pan).
To get accurate positioning we need to change the values in the pan channel from Phys (270) and To Phys (-270) Now it should have the correct pan range.
It also has a tilt range of -150 to 150 in phys values but the manual has 240 degrees on tilt so we need to change the tilt values in tilt channel From Phys (-120) and To Phys (120) Now we should get reasonably accurate positioning

Then there are some fixtures that home at different pan angles. For example Beyes and Magic Panels home pan position default is 90degrees and something like an Alphaspot 1200 homes at 45 degrees pan.
I have built my models to reflect this, so if you add a Beye, and have the arrow forward, it will tilt to the side as a beye does in reality (unless of course, this has been altered on the fixture itself or the fixture has been hung sideways)

PAN AND TILT INVERTS
Avoid Inverting Pan & Tilts in Patch or fixture type window. These only affect real dmx and do not show in MA3d and thus breaks the link between reality and 3d. Use Pan and Tilt inverts only when you get to a show and some real fixtures have been hung the wrong way or if a real fixture has its pan inverted on the fixture itself for example

Instead of pan and tilt invert - If you want all your fixtures to pan left when you turn encoder left regardless of type or orientation or want them all to tilt up etc use the Invert encoder options in patch window for individual or groups of fixtures. This works for both reality and 3d and does not alter the dmx values being sent or break the link between reality and 3d

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