by RollerBall » Mon May 12, 2003 3:53 am
Hi xmit
Excluding objects is an interesting exercise. Remember you don't need to place huge exclusion areas over objects - you only need to exclude their ref points.
So you can exclude large objects with VERY small exclusion areas - the trick is to find the ref point for each one. For example, in Kai Tak, I've excluded the WHOLE default runway with an exclusion area of just 20m x 20m.
A ref point is usually at an object's 'centre'. As it happens, the ref point was not quite in the rwy centre and I had to develop my own system to 'home' in by placing a 'large' exclusion area over the expected ref point position (something like 200m x 200m), moving
it around until the object (plus others around it) disappeared, actually drawing it's position on my monitor in dry marker, reducing the exclusion area to say a third of the original size, moving that one around within the boundary on my monitor in a grid pattern until the object disappeared (but not the surrounding objects) and repeating the process until I was happy.
With a building finding a ref point is pretty easy but with objects like taxiways it's harder. Even so, by trial and error using my system I found a ref point somewhere near the centre of the airport where a relatively small exclusion area took out the taxiways and most of the concrete apron. Again, by reducing its size I was able to take out taxiways and leave in apron. That left me with a flattening problem even with an A16N flatten in place but that's another story.
Dick 'rhumbaflappy' Ludowise told me about ref points and it's proven to be very useful information. I think you could use it here.
Arno of the Netherlands Scenery Design Group is one of the top designers as well as being one of the most helpful as you know from the FSSC and other design forums. I tried for quite a while to make my Kai Tak apron lights turn on and off at dusk/dawn without success. He gave me a fix within a few minutes of my posting the problem.
What would we do without these guys?
Roger