I'd like to ask if it's possible to specify the number and arrangement of RGB elements in a Generic fixture, especially as it relates to Onyx. For example "Generic Colors RGB Pixel Mode: 50". This is selectable in the Onyx library and all 50 RGB pixels get assigned one ID #, e.g. 732, and then each 3 channel RGB element gets a Group # (1-50) and the ID gets a sub-number: 732.1, 732.2, etc. displayed on the Fixtures page. This is a 55" long pixel strip populated with 50 WS2811 12V pixels. All good so far - I believe I basically just created a multi-part fixture.
Now off to Capture. Thinking that I read that Onyx and Capture use the exact same Altabase fixture database, this should be easy. The closest match in the Generic section is a "RGB LED Round Pixel 15mm", and you can only drag one of these onto the stage. If there are parameters associated with that generic fixture that allow you to select more than one RGB element to match what you can do in Onyx, I certainly missed it. So as I understand it to make my 50 pixel strip, I'd have to drag 49 more or duplicate the 1st unti I have my 50 pixels all tightly aligned together, each with their own 3 channel address and channel number. Only the first pixel Channel # in Capture can match the ID number in Onyx. You can't (as far as I know) enter 732.1, 732.2, etc. into Capture! To make eight of these, I'd be generating 400 new fixture ID's in Onyx and 400 new channels in Capture.
Not ideal. Having said that though, I haven't investigated the possible properties of each and every generic fixure in the Capture library.
So how do you do this with pixel strips or worse, with a large pixel matrix that doesn't happen to match anything in the Capture database. OK, sure - I (or anyone) could put in a fixture request, but that seems to be a poor option for pixel-populated fixtures that could be any size - an infinite number of sizes and matrix configurations - up to the limit of Universe licenses in Capture and Onyx - and, you don't do custom fixtures for student versions anyways.
I did find one fixture that is close - A "DMT Pixelstrip P25 MKII 120 Channel". That gets me 40 RGB pixels under one Onyx ID/Capture Channel that works, but then I'd lose 10 pixels per strip. Any better thoughts on how to do this?