Title: 3D Heightfield rendering Post by: David Makin on July 05, 2009, 07:08:55 AM Hi all, I just realised that my alternative to the standard distance estimator could be adapted for use in rendering heightfield fractals.
First results: (http://fc04.deviantart.com/fs46/f/2009/185/5/a/Mandelbrot_Heightfield_by_MakinMagic.png) If no image above: http://makinmagic.deviantart.com/art/Mandelbrot-Heightfield-128316417 (http://makinmagic.deviantart.com/art/Mandelbrot-Heightfield-128316417) And: (http://fc07.deviantart.com/fs48/f/2009/185/c/9/Minibrot_Heightfield_by_MakinMagic.png) If no image above: http://makinmagic.deviantart.com/art/Minibrot-Heightfield-128316816 (http://makinmagic.deviantart.com/art/Minibrot-Heightfield-128316816) Rendered using pure ray-casting i.e. no triangles or polygons. In both the height is atan(smooth iter - 3)/atan(max. iter - 3) or 0 if iter<3 max iter was 60 bailout was 1024 On my 3GHz P4HT @640*480 the full Mandy took 30secs and the minibrot zoom took 2mins 40secs (I cranked the detail up on that such that the ray-stepping was reduced by a factor of 2.5). Title: Re: 3D Heightfield rendering - Improved algorithm Post by: David Makin on July 08, 2009, 01:16:54 PM Hi, I tinkered with the way I was calculating the step distances - new results:
bailout 1024 max. iter. 60 "Inside" height 2.0 (http://fc08.deviantart.com/fs48/f/2009/189/0/2/Julia_Iter_Heightfield_by_MakinMagic.png) If no image above: http://makinmagic.deviantart.com/art/Julia-Iter-Heightfield-128717839 (http://makinmagic.deviantart.com/art/Julia-Iter-Heightfield-128717839) The above took just 11.78 seconds @640*480, the heights based on atan(smooth iteration). (http://fc06.deviantart.com/fs46/f/2009/189/4/e/Julia_DE_Heightfield_by_MakinMagic.png) If no image above: http://makinmagic.deviantart.com/art/Julia-DE-Heightfield-128718029 (http://makinmagic.deviantart.com/art/Julia-DE-Heightfield-128718029) The above took just 11.28 secs. Height based on standard Distance estimator colouring. Title: Re: 3D Heightfield rendering - Orbit Traps etc. Post by: David Makin on July 09, 2009, 02:59:54 PM Hi all, (http://fc09.deviantart.com/fs47/f/2009/190/4/c/Orbit_Trap_Heightfield_by_MakinMagic.jpg) If no image above then: http://makinmagic.deviantart.com/art/Orbit-Trap-Heightfield-128850151 (http://makinmagic.deviantart.com/art/Orbit-Trap-Heightfield-128850151) This is more like what I'm aiming at with rendering heightfields. Height based on "Orbit Trap" "closest". Nice image but unfortunately to render this well using my current algorithm took nearly 15 mins @640*480. I'm workiing on the speed, hopefully getting the quality of rendering this image as good in under 1 minute - if I can do that then the algorithm will basically be able to render heightfields based on any colouring algorithm. |