I use Robin Tarrantula in a show, but have many problem with the visualisation in the 3D Window. For the DMX value, all seem to work.
I use the GDTF file made by Robe. I can use the dim parameter to get a beam in the 3D, but it appear only for the flower part of the fixture. and it is impossible to get the color R, V, B and W. I think it's a problem with the geometry declaration of the fixture.
Someone can help me with this problem ?