{"id":1536,"date":"2012-04-17T17:22:04","date_gmt":"2012-04-17T17:22:04","guid":{"rendered":"https:\/\/www.cg-blog.com\/?p=1536"},"modified":"2012-12-11T14:41:47","modified_gmt":"2012-12-11T14:41:47","slug":"rusty-material-vray-lens-effect","status":"publish","type":"post","link":"https:\/\/www.cg-blog.com\/index.php\/2012\/04\/17\/rusty-material-vray-lens-effect.htm","title":{"rendered":"Nails &#8211; Rusty material and V-Ray Lens effect."},"content":{"rendered":"<p><strong>Let\u00e2\u20ac\u2122s complete with STEP 3-4-5 our 5SR-Workflow\u00c2\u00ae.<\/strong><br \/>\nHere it is what we\u00e2\u20ac\u2122ve done so far:\u00c2\u00a0<a href=\"https:\/\/www.cg-blog.com\/index.php\/2012\/04\/03\/rayfire-objects.htm\" target=\"_blank\">Placing 3d Model<\/a>(1) &gt;\u00c2\u00a0<a href=\"https:\/\/www.cg-blog.com\/index.php\/2012\/04\/09\/nails-lighting-reflections.htm\" target=\"_blank\">Light Balance<\/a>(2)<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Topics of this lesson:<\/strong><\/p>\n<ul>\n<li>Simulate rusty material<\/li>\n<li>cutout filter for perfect bump effect<\/li>\n<li>how to use V-Ray Lens Effect<\/li>\n<li>How to correct images with levels\/curve in VFB (V-Ray Frame Buffer)<\/li>\n<\/ul>\n<div><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/nails-step345-topicsB.jpg\" rel=\"lightboxprev\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1543\" title=\"topics-thumb\" src=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/topics-thumb.jpg\" alt=\"\" width=\"599\" height=\"330\" srcset=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/topics-thumb.jpg 599w, https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/topics-thumb-300x165.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/a><\/div>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">Let&#8217;s complete this scene.<\/h2>\n<p style=\"text-align: center;\"><strong>STEP 3.1 : CREATE RUSTY MATERIAL<\/strong><\/p>\n<p>[private Premium|Premium-1year|5trainings]<\/p>\n<p>To create rusty material we need<\/p>\n<ol>\n<li>A &#8220;<strong>rusty<\/strong>&#8221; texture for the diffuse channel &#8211; <a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/rusty1paint.jpg\" rel=\"lightboxtex\">CLICK HERE TO SEE<\/a><\/li>\n<li>Another texture to <strong>map reflections<\/strong> &#8211; <a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/rusty2-reflection.jpg\" rel=\"lightboxtex\">CLICK HERE TO SEE<\/a><\/li>\n<\/ol>\n<p>What is mapping reflections? If you just put a gray\/white in the &#8220;reflect&#8221; box you&#8217;ll get an uniform reflection. That&#8217;s good for new metals, but to simulate rusty\u00c2\u00a0we need mapped reflections: we will use a white\/black map. In this way we will get more and less reflection according to the whites and blacks in the map.<\/p>\n<p><strong>TRICK:\u00c2\u00a0<\/strong>Use the same map in &#8220;<strong>Reflection<\/strong>&#8221; and &#8220;<strong>RGlossiness<\/strong>&#8220;, then reduce the value to control the effect. I usually low the maps value around 50-70<\/p>\n<p><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/rusty-material.jpg\" rel=\"lightboxrusty\">Click here to see RUSTY MATERIAL<\/a>, and see the effect in the images below:<\/p>\n<p><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/uniform-mapped.jpg\" rel=\"lightboxrusty\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1540\" title=\"uniform-mapped-thumb\" src=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/uniform-mapped-thumb.jpg\" alt=\"\" width=\"599\" height=\"315\" srcset=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/uniform-mapped-thumb.jpg 599w, https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/uniform-mapped-thumb-300x157.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>STEP 3.2 : PERFECT BUMP MAP WITH CUTOUT FILTER<\/strong><\/p>\n<p>I&#8217;m sure you&#8217;re thinking to use <strong>&#8220;rusty2-reflection.jpg&#8221; <\/strong>into the<strong> bump channel\u00c2\u00a0<\/strong>to get some relief. Right? You can do it but the result will be a dotted surface: to avoid this problem we need to &#8220;simplify&#8221; this texture. To do this we can use <strong>Cutout filter<\/strong> in Photoshop.<\/p>\n<p>Open &#8220;rusty2-reflection.jpg&#8221;\u00c2\u00a0in photoshop and apply filter &gt; artistic &gt; cutout :<\/p>\n<p><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/simplified.jpg\" rel=\"lightboxcut\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1542\" title=\"simplified-thumb\" src=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/simplified-thumb.jpg\" alt=\"\" width=\"599\" height=\"285\" srcset=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/simplified-thumb.jpg 599w, https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/simplified-thumb-300x142.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/a><\/p>\n<p>Check what a difference in <strong>bump<\/strong>, applying <strong>&#8220;rusty2-reflection.jpg&#8221;,<\/strong>\u00c2\u00a0BEFORE and AFTER <strong>cutout<\/strong> treatment:<\/p>\n<p><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/dotted-nodotted.jpg\" rel=\"lightboxcut\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1546\" title=\"dotted-nodotted-thumb\" src=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/dotted-nodotted-thumb.jpg\" alt=\"\" width=\"599\" height=\"280\" srcset=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/dotted-nodotted-thumb.jpg 599w, https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/dotted-nodotted-thumb-300x140.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/a><\/p>\n<p>I can&#8217;t say what image is better.<br \/>\nI just want to show you the way, you&#8217;ll choose what effect you prefer to simulate different kinds of rusty materials.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>STEP 4-5 : FINAL RENDER and COLOR CORRECTION<\/strong><\/p>\n<p>I will not spend time on step4 &#8211; Final Render: just load &#8220;FINAL&#8221; setup and click render.\u00c2\u00a0Even if the ground is a little bit grainy there&#8217;s no problem, now we have to <strong>investigate Color Correction with VFB and V-Ray Lens Effect<\/strong>.<\/p>\n<p>When the render is complete we can do a lot of things with the <strong>V-Ray Frame Buffer<\/strong> (<strong>VFB<\/strong>)!<\/p>\n<p>Watch this video to see how:<\/p>\n<ul>\n<li>correct levels<\/li>\n<li>correct curves<\/li>\n<li>Add V-Ray Lens Effect ( menu &gt; rendering &gt; <strong>effects<\/strong> )<\/li>\n<li>Balance colors<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" src=\"http:\/\/player.vimeo.com\/video\/40532072?byline=0&amp;color=ff9933\" frameborder=\"0\" width=\"950\" height=\"534\"><\/iframe><\/p>\n<p><a href=\"https:\/\/www.cg-blog.com\/wp-content\/uploads\/2012\/04\/final-balanced.jpg\" rel=\"lightboxfin\">CLICK HERE to see the Final Render \/ Balanced<\/a><\/p>\n<p><span style=\"color: #ff0000;\"><strong>[ Read<\/strong><\/span>. Sometimes, by clicking &#8220;update&#8221; the render starts again? This is an error of 3ds max related (not V-Ray) -\u00c2\u00a0For the future at Chaosgroup they are considering moving the lens effect to the VFB. ]<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">EXERCISE<\/h2>\n<p>The main aspect of this lesson is creating rusty material. You can apply these techniques in many cases, also with old parquets for example. Just take care to use the right values with maps and bump. For this only your taste can helps you!<\/p>\n<p><strong>Download and try<\/strong>:\u00c2\u00a0<a href=\"https:\/\/www.cg-blog.com\/files\/Premium\/nails\/step345\/nails345---start.zip\">NAILS STEP5\u00e2\u20ac\u201dSTART<\/a>\u00c2\u00a0(hdri and maps are included)<\/p>\n<p>Tasks:<\/p>\n<ul>\n<li>Create rusty material<\/li>\n<li>Use Cutout filter (photoshop) for a perfect bump map<\/li>\n<li>Use exposure\/levels\/curve in VFB<\/li>\n<li>Add bloom with V-Ray Lens Effect<\/li>\n<li>Balance the image with Photoshop<\/li>\n<\/ul>\n<p><strong>Solution<\/strong>:\u00c2\u00a0<a href=\"https:\/\/www.cg-blog.com\/files\/Premium\/nails\/step345\/nails345---final.zip\">NAILS STEP5 &#8212; COMPLETE<\/a><\/p>\n<p>[\/private]<\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>LESSON #17<\/strong>: In this lesson we will simulate rusty material, use cutout filter for perfect bump effect and learn how to use V-Ray Lens Effect to add a photorealistic bloom.<\/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":[24,49,51],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/posts\/1536"}],"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=1536"}],"version-history":[{"count":0,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/posts\/1536\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/media?parent=1536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/categories?post=1536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cg-blog.com\/index.php\/wp-json\/wp\/v2\/tags?post=1536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}