> If something exists and works in the default scheme, but is missing or does > not work in a child scheme then that child scheme is broken or we might say > that there is a regression.
Which all would be relevant if it would be a child scheme - which it isn't. >The solution was obvious - combine the Fresnel and > Rainbow look-up textures into 1 texture. A few trivial changes - job done. > Of more interest, we could, and probably should, do something similar for > almost any complex math function. That depends on the complexity. To compute the rainbow is a rotation in color space - GPU's have hardware acceleration to do the job and this computes way faster than looking up a texture. A typical Fresnel curve can probably be parametrized by a polynomial - if so, again that'd be way faster than a texture lookup. In no test case I've studied so far was a texture lookup superior to function evaluation - exponentials, combinations of sine functions or even the generalized logistic function computes way faster than a texture lookup. Akenine-Moller 'Real Time Rendering' also confirms that on modern GPUs functions evaluate typically faster than texture lookups. Plus, you can evaluate a function only when needed, whereas you must evaluate a texture. Unless the function is an integral, I don't see the need to introduce yet more texture lookups. I have indicated my plan to replace this by a functionsfor better performance in ALS and will do so in the mid-term - you may disregard my experiences at your pleasure. Best, * Thorsten ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
