Re: anybody use raytracing
I've made the files available at http://www.ph-cip.uni-koeln.de/~roth/movie.html Problems occured with the downloaded files. I've zipped them now and it should work. The surface property of the stone shown is not very diffusive. Therefore the light reflected into the observers eye is varying strongly in intensity. - Daniel Roth
Re: anybody use raytracing
There are free raytracing packages available that allow you to describe a 3-dimensional object and render an image of it with light sources placed at will. Has anybody used these to simulate sundials? Seems like it should work. Yes, I tried it with POVRAY. I defined a stone and a long cylinder as the shadow caster in this ray tracing software. The necessary POV-files were generated by a program calculating suns azimuth and elevation to put the light source in the correct direction. The small movie I generated shows the figure 8 line painted by the shadow through one year for the same mean time each day. I think this is of great educational interest but so far I had no time to make more movies (including the numbers, lines and so on on a sundial). - Daniel Roth
Re: anybody use raytracing
On Wed, 17 Jun 1998, Doyle J. Groves wrote: Sounds interesting. Could you perhaps make this movie available to the group or at least email me a copy? I've made the files available at http://www.ph-cip.uni-koeln.de/~roth/movie.html As I mentioned they are not what can be done. You'll need a FLC-player which can also be downloaded from the above address. - Daniel Roth
anybody use raytracing
There are free raytracing packages available that allow you to describe a 3-dimensional object and render an image of it with light sources placed at will. Has anybody used these to simulate sundials? Seems like it should work.
