{"id":1110,"date":"2012-01-02T22:49:06","date_gmt":"2012-01-02T22:49:06","guid":{"rendered":"https:\/\/www.cg-blog.com\/?p=1110"},"modified":"2012-01-10T12:12:00","modified_gmt":"2012-01-10T12:12:00","slug":"faster-caustics-vray","status":"publish","type":"post","link":"https:\/\/www.cg-blog.com\/index.php\/2012\/01\/02\/faster-caustics-vray.htm","title":{"rendered":"How to get faster caustics"},"content":{"rendered":"<p>Do you remember how easy is Caustic setup? I talked about in this post: <a href=\"https:\/\/www.cg-blog.com\/index.php\/2011\/12\/27\/vray-caustics-setup-tutorial.htm\">V-Ray caustics in the pool<\/a>.<\/p>\n<p>With exterior pool is easy getting nice caustics because we have a strong and focused light: the sun. How to achive a similar result using a diffuse light like <strong>V-Ray light<\/strong>?<\/p>\n<p>It&#8217;s really hard. V-Ray light shoots photons everywhere (at 180\u00c2\u00b0) so we need a looot of subdivisions to get a valuable result.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1112\" title=\"caustic-spot-light\" src=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/01\/caustic-spot-light.jpg\" alt=\"\" width=\"599\" height=\"300\" srcset=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/01\/caustic-spot-light.jpg 599w, https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/01\/caustic-spot-light-300x150.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><br \/>\n<a name=\"premium\"><\/a><br \/>\nLots of subdivisions means lots of time: 20.000 subdivisions need around 10mins to render this simple scene (left image). But there&#8217;s a trick to <strong>render this scene in few seconds!<\/strong><\/p>\n<p style=\"text-align: center;\"><strong>Free sample Premium content.<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.cg-blog.com\/images\/more-contents-sample.jpg\" alt=\"\" \/><\/p>\n<p>Split <strong>light<\/strong> and <strong>caustics<\/strong> in 2 different sources:<\/p>\n<ul>\n<li>a <strong>V-Ray light<\/strong> for normal lighting<\/li>\n<li>a <strong>standard Spot Light<\/strong> just for caustics<\/li>\n<\/ul>\n<p>The spot light is perfect to focus caustics in a specific area. Above you can see the image on the right, rendered in only 13 seconds. It&#8217;s pretty the same way that Ricardo Eloy\u00c2\u00a0<a href=\"http:\/\/vimeo.com\/28008416\" target=\"_blank\">in this tutorial<\/a>, I just changed some little thing and did it in few minutes.<\/p>\n<p>Of course this is a sort of fake solution, because diffuse lights can&#8217;t produce strongs caustics. Anyway this method can help us to get a really nice effect.<\/p>\n<p>Watch the <strong>video<\/strong>, download the <strong>file<\/strong> below and complete the <strong>exercise<\/strong>!<\/p>\n<p><strong>VIDEO<\/strong> :<\/p>\n<p><iframe loading=\"lazy\" src=\"http:\/\/player.vimeo.com\/video\/34461030?color=ff9933\" frameborder=\"0\" width=\"599\" height=\"337\"><\/iframe><\/p>\n<p><strong>VIDEO-SUMMARY\u00c2\u00a0<\/strong>:<\/p>\n<ol>\n<li>Disable caustics for V-Ray light<\/li>\n<li>Add spot light (multipl. 1.000.000) and exclude everything<br \/>\n( Make V-Ray light invisible if the spot is behind it )<\/li>\n<li>Enable caustics<\/li>\n<li>Clic render and wait few seconds \ud83d\ude42<\/li>\n<\/ol>\n<p><strong>EXERCISE<\/strong> :<\/p>\n<p>Now, <a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/01\/faster-caustics.zip\">download this file and repeat the exercise<\/a>.<br \/>\nFor any doubts check the &#8220;FINAL&#8221; version file.<\/p>\n<p>Enjoy it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Caustics with V-Ray light takes too much time to be calculated? Split light and caustics in 2 different sources: a V-Ray light for normal lighting a standard Spot Light just for caustics. Then get it in few seconds.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false},"categories":[24,39],"tags":[41],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/posts\/1110"}],"collection":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/comments?post=1110"}],"version-history":[{"count":0,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/posts\/1110\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/media?parent=1110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/categories?post=1110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/tags?post=1110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}