{"id":824,"date":"2012-03-27T00:05:04","date_gmt":"2012-03-26T21:05:04","guid":{"rendered":"http:\/\/unitycoder.com\/blog\/?p=824"},"modified":"2013-12-15T18:23:26","modified_gmt":"2013-12-15T15:23:26","slug":"shadow-casting-convex-hull-more-fake-shadows","status":"publish","type":"post","link":"https:\/\/unitycoder.com\/blog\/2012\/03\/27\/shadow-casting-convex-hull-more-fake-shadows\/","title":{"rendered":"Shadow Casting + Convex Hull = More Fake Shadows"},"content":{"rendered":"

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

Combine Simple Shadow Casting<\/a> & Monotone Chain Convex Hull<\/a> and you have…more fake shadows for unity indie!!1<\/p>\n

Works fine for a box..should try the teapot next.<\/p>\n

Details:<\/strong>
\n– Calculate vectors from the light, through every vertex in target object,\u00a0 lengthen the vector until reach ground (y=0)
\n– You get list of points in the ground, convex hull them to get shadow outline
\n– Create shadow mesh from the convex hull points<\/p>\n

Ideas:<\/strong>
\n– Try multiple lights? Multiple objects?
\n– Soft shadows? (shader)
\n– ShadowMesh could have trigger collider, to check if object enters shadow?
\n– Use ShadowMesh as a mask for something else..(?)
\n– Only cast shadows for objects in view? (or objects within _ – range from light?)
\nWebplayer:<\/strong>
\nhttp:\/\/unitycoder.com\/upload\/demos\/ShadowCastingConvexHull2\/<\/a><\/p>\n

Download source:<\/strong>
\n shadowhull1.unityPackage<\/a><\/p>\n

—<\/p>\n

Image#2:<\/strong> Deep profiler report (array sorting seems to take most of the time..)<\/p>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Combine Simple Shadow Casting & Monotone Chain Convex Hull and you have…more fake shadows for unity indie!!1 Works fine for a box..should try the teapot next. Details: – Calculate vectors from the light, through every vertex in target object,\u00a0 lengthen the vector until reach ground […]<\/p>\n","protected":false},"author":1,"featured_media":825,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4,3],"tags":[133,215,7,40,217,216],"class_list":["post-824","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-demos","category-unity3d","tag-casting","tag-convex-hull","tag-fake","tag-shadow","tag-shadow-caster","tag-simple"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/unitycoder.com\/blog\/wp-content\/uploads\/2012\/03\/fake_shadow_casting_convex_hull1.jpg?fit=680%2C465&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p1KTaT-di","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/comments?post=824"}],"version-history":[{"count":9,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/824\/revisions"}],"predecessor-version":[{"id":2545,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/824\/revisions\/2545"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media\/825"}],"wp:attachment":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media?parent=824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/categories?post=824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/tags?post=824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}