Thank you for responding. I think I understand your approach but I'm still struggling with the whole 'placement' issue. In other words, taking your example:
light.5 = 2, 0.00, -0.70, 1.40, fx_strobe
I appreciate that the three number separated by 'comma' represent XYZ but I'm fuzzy on two things:
1. They are relative to the reference datum right? Which is what/where exactly? I mean, I see the reference in the cfg file but am still unclear how I would determine the position on a given model. or is that irelevant?
2. I figured I'd start editing / fiddling with the XYZ to see if the light/smoke moves. I've dabbled a bit already but havent seen the darn thing move! Am I missing something? I assume I should only change one number at a time and see what changes in the sim right? But how much is enough? Perhaps I'm making too small a change?
As far as I understand the coordinate system ;D, imagine a 'zero-point' somewhere in the aircraft. It's the same point from which the maker starts to build the model. Could be the prop, could be the pilot or in this case, the frontside of the wing. From there, the coordinates tells us to go 'units' to the front or aft, left and right, up and down. So on the Extra, from this fictive point the smoke stays in the front of the plane (0.00), is slightly moved the the left(-0.70) and floats 1.4 units above the ground (1.40) If I replace it by a strobe, this is what you see:
So even a small offset like -0.70 is enough to show the lamp on the lefthand side of the engine.