Jim Wilson advised: > > Norman Vine <[EMAIL PROTECTED]> said: > > > Vivian Meazza writes: > > > > > > I remain disconcerted that the visual model appears to > roll through > > > 180 degs vertically on the up and down legs of a loop > when in chase > > > or helicopter view. Not the end of the world, but lacking realism. > > > > Yes this is a short coming of the math method used. > > > > Note that the cursor should also be restrained in the vertical > > direction so as to not wrap from the top to the bottom, or > visa versa, not doing > > so potentially compounds the confusion > > > > Put simply the matrix math used supports a 'restrained' cylindrical > > viewer > > not a true spherical viewer. > > > > The reasons that FlightGear does not use a quaternion model > for this, > > I will > > leave for others to explain. > > > > That is a problem, but it isn't the issue here. In the chase > views the camera is aft of the aircraft position > (horizontally). On going into the upside down part of a loop > the heading of the aircraft does a sudden 180, so "aft" is > now the other way. And thus the direction of view is doing a > 180. If you want to avoid this then you need a different > type of view configuration. > > One way is to not set the heading input for the view. Then > you will always look at the plane from the North. > > Best, > > Jim > Thanks Jim, that saved me several days of devilling around - works beautifully.
Vivian Meazza _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
