Hi, On Friday 10 April 2009 15:47:30 Vivian Meazza wrote: > Alexis Bory has added some wonderful detail to our model of the Nimitz > class. I think he's mad :-) but see for yourself: > > ftp://ftp.abbeytheatre2.org.uk/fgfs/Nimitz/Vinson-1.jpg > ftp://ftp.abbeytheatre2.org.uk/fgfs/Nimitz/Vinson-2.jpg > > The new model increases the vertex count by an order of magnitude, so you > may find that your framerate is hit when using it. In order to minimise > this we have added a new scenario using USS Carl Vinson 60nm west of KSFO.
Great stuff! I do not expect too much problems with the execution speed with high polygon models and the reworked ground cache. In the old implementation we have two sources of an increased run time for high polygon models we want to step on. 1. The rendering speed. 2. The ground cache build and lookup. While we still need to render high polygon models, we have algorithically improved groundcache times. For the impact of the polygon count on the gpu, it is more or less the same to render 5 or 500 polygons. The object rendering setup and the state changes in between rendering on the gpu is the expensive part. And this is the same for few polygons or for moderately more polygons. It is way more important to have well structured models that can render fast. The groundcache part was blowing us away with higher polygon models. We had build and lookup times in the magnitude of O(n) where n is the triangle count around the aircraft. Now with the collision tree the lookup is O(log(n)). I have not thought in detail about the algorithmical complexity of the ground cache build time, but I would guess that this is also somehow bounded by O(log(n)). This does not mean that we do no longer need to care for the polygon count, but if it is worth it - do it. May be the lower polygon models can still be used as lower LOD models ... So all in all: Great to see nice looking that high polygon models for the carrier. Beware using them with the past flightgear release (I guess) :) Greetings Mathias ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel