{"id":28,"date":"2009-12-19T23:54:46","date_gmt":"2009-12-19T22:54:46","guid":{"rendered":"http:\/\/www.clodo.it\/blog\/?p=28"},"modified":"2024-04-09T16:02:11","modified_gmt":"2024-04-09T15:02:11","slug":"sphere-spirals-1958-mc-escher","status":"publish","type":"post","link":"https:\/\/www.clodo.it\/blog\/sphere-spirals-1958-mc-escher\/","title":{"rendered":"Povray Render – Sphere spirals, 1958, MC Escher"},"content":{"rendered":"

\"Immagine<\/p>\n

\"Immagine<\/a> \"Immagine<\/a> \"Immagine<\/a> \"Immagine<\/a> \"Immagine\u00a0<\/a><\/p>\n

Download MP4<\/a><\/p>\n

Rendering di una isosuperficie<\/a> ispirata da un’opera di Escher, Sphere Spirals.<\/a>
\nFormule per Povray da “Almost Sphere Spirals”<\/a> by Tor Olav Kristensen<\/a> (2002)<\/p>\n

‘Tor Olav Kristensen’ said<\/p>\n

An isosurface shape inspired by M.C. Escher’s “Sphere Spirals” (“Bolspiralen”) woodcut print from 1958. The edges of the four spiraling bands on the sphere can be formed by an inverse stereographic projection of eight infinite logarithmic spirals in a complex plane tangent to a Riemann Sphere onto it’s surface. I found some useful information about this shape here<\/a>.<\/p><\/blockquote>\n

Shot 1: Twisting rate a 1.5, 4 bande. 1920 x 1080. Rendering: 2 ore circa.
\nShot 2: Twisting rate a 0.1, 1 banda. 1920 x 1080. Rendering: 20 ore circa.
\nShot 3: Twisting rate a 0.5, 4 bande. 1920 x 1080. Rendering: 8 ore circa.
\nShot 4: Twisting rate a 1.9, 12 bande. 1920 x 1080. Rendering: 1 ora circa.
\nShot 5: Twisting rate a 1.0, 4 bande, fog. 1920 x 1080. Rendering: 8 ore circa.
\nAnimazione: Twisting rate variabile da 1 a 3, 4 bande. 640 x 360, 30 fps, 600 fotogrammi (20 sec). Rendering: 2-3 settimane su 3 macchine circa, tempo variabile da 3 ore a mezz’ora per ogni fotogramma.<\/p>\n

Tutti con antialiasing di default, senza radiosit\u00e0.
\nIn dettaglio, i riflessi non incidono particolarmente nei tempi di rendering. E’ l’isosuperficie che “ammazza”, in particolare con bassi valori di twisting rate.<\/p>\n

Sorgenti (PovRay<\/a> 3.6 richiesto, 3.7 consigliato): ini<\/a>, pov<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0 Your browser does not support HTML5 video. Download MP4 Rendering di una isosuperficie ispirata da un’opera di Escher, Sphere Spirals. Formule per Povray da “Almost Sphere Spirals” by Tor Olav Kristensen (2002) ‘Tor Olav Kristensen’ said An isosurface shape inspired by M.C. Escher’s “Sphere Spirals” (“Bolspiralen”) woodcut print from 1958. The edges of the … Continue reading Povray Render – Sphere spirals, 1958, MC Escher<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":499,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,3],"tags":[18,17],"uagb_featured_image_src":{"full":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere.jpg",1328,749,false],"thumbnail":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere-150x150.jpg",150,150,true],"medium":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere-300x169.jpg",300,169,true],"medium_large":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere-768x433.jpg",660,372,true],"large":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere-1024x578.jpg",660,373,true],"1536x1536":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere.jpg",1328,749,false],"2048x2048":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere.jpg",1328,749,false],"post-thumbnail":["https:\/\/www.clodo.it\/blog\/wp-content\/uploads\/2009\/12\/feature-povray_isosphere-825x510.jpg",825,510,true]},"uagb_author_info":{"display_name":"Clodo","author_link":"https:\/\/www.clodo.it\/blog\/author\/clodo\/"},"uagb_comment_info":1,"uagb_excerpt":"\u00a0 Your browser does not support HTML5 video. Download MP4 Rendering di una isosuperficie ispirata da un’opera di Escher, Sphere Spirals. Formule per Povray da “Almost Sphere Spirals” by Tor Olav Kristensen (2002) ‘Tor Olav Kristensen’ said An isosurface shape inspired by M.C. Escher’s “Sphere Spirals” (“Bolspiralen”) woodcut print from 1958. The edges of the…","_links":{"self":[{"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/posts\/28"}],"collection":[{"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/comments?post=28"}],"version-history":[{"count":6,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/posts\/28\/revisions"}],"predecessor-version":[{"id":526,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/posts\/28\/revisions\/526"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/media\/499"}],"wp:attachment":[{"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/media?parent=28"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/categories?post=28"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.clodo.it\/blog\/wp-json\/wp\/v2\/tags?post=28"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}