{"id":1146,"date":"2012-10-02T19:16:33","date_gmt":"2012-10-02T16:16:33","guid":{"rendered":"http:\/\/unitycoder.com\/blog\/?p=1146"},"modified":"2014-06-20T15:25:35","modified_gmt":"2014-06-20T12:25:35","slug":"fake-godrays-shader","status":"publish","type":"post","link":"https:\/\/unitycoder.com\/blog\/2012\/10\/02\/fake-godrays-shader\/","title":{"rendered":"Fake Godrays Shader"},"content":{"rendered":"

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

Godrays shader on a plane texture.. since no RenderToTexturein indie. ( Converted to unity from this webgl shader<\/a>)
\nShould try it as a camera shader also..<\/p>\n

Features:<\/strong>
\n– Adjustable values: effect xy position, exposure, decay, density, weight, clamp,\u00a0 samples (screenshot is using 100 samples)<\/p>\n

Webplayer:<\/strong>
\nhttp:\/\/unitycoder.com\/upload\/demos\/fake_godrays_shader_unity\/<\/a><\/p>\n

Source (shader):<\/p>\n

\r\nShader "UnityCoder\/Rays2" \r\n{\r\n\tProperties \r\n\t{\r\n\t\ttDiffuse ("Base (RGB)", 2D) = "white" {}\r\n\t\tfX ("fX", Float) = 0.5 \/\/ you can feed mouse xpos here with script: var mpos:Vector3 = Camera.main.ScreenToViewportPoint(Input.mousePosition); renderer.material.SetFloat( "fX", mpos.x);\r\n\t\tfY ("fY", Float) = 0.5 \/\/  mouse ypos\r\n\t\tfExposure ("fExposure", Float) = 0.6\r\n\t\tfDecay ("fDecay", Float) = 0.93\r\n\t\tfDensity ("fDensity", Float) = 0.96\r\n\t\tfWeight ("fWeight", Float) = 0.4\r\n\t\tfClamp ("fClamp", Float) = 1.0\r\n\t\t\/\/iSamples ("iSamples", Int) = 20\r\n\t}\r\n\tSubShader {\r\n\t\tTags { "RenderType"="Opaque" }\r\n\t\tLOD 200\r\n\t\tCull Off\r\n\t\t\r\n\t\tCGPROGRAM\r\n\t\t#pragma target 3.0\r\n\t\t#pragma surface surf Lambert\r\n\r\n\t\tsampler2D tDiffuse;\r\n\t\tfloat fX,fY,fExposure,fDecay,fDensity,fWeight,fClamp,iSamples;\r\n\r\n\t\tstruct Input {\r\n\t\t\tfloat2 uvtDiffuse;\r\n\t\t\tfloat4 screenPos;\r\n\t\t};\r\n\r\n\t\tvoid surf (Input IN, inout SurfaceOutput o) \r\n\t\t{\r\n\t\t\tint iSamples=100;\r\n\t\t\tfloat2 vUv = IN.uvtDiffuse;\r\n\t\t\t\/\/vUv *= float2(1,1); \/\/ repeat?\r\n\t\t\tfloat2 deltaTextCoord = float2(vUv - float2(fX,fY));\r\n\t\t\tdeltaTextCoord *= 1.0 \/  float(iSamples) * fDensity;\r\n\t\t\tfloat2 coord = vUv;\r\n\t\t\tfloat illuminationDecay = 1.0;\r\n\t\t\tfloat4 FragColor = float4(0.0);\r\n\t\t\tfor(int i=0; i < iSamples ; i++)\r\n\t\t\t{\r\n\t\t\t\tcoord -= deltaTextCoord;\r\n\t\t\t\tfloat4 texel = tex2D(tDiffuse, coord);\r\n\t\t\t\ttexel *= illuminationDecay * fWeight;\r\n\t\t\t\tFragColor += texel;\r\n\t\t\t\tilluminationDecay *= fDecay;\r\n\t\t\t}\r\n\t\t\tFragColor *= fExposure;\r\n\t\t\tFragColor = clamp(FragColor, 0.0, fClamp);\r\n\t\t\tfloat4 c = FragColor;\r\n\t\t\to.Albedo = c.rgb;\r\n\t\t\to.Alpha = c.a;\r\n\t\t\t\r\n\t\t}\r\n\t\tENDCG\r\n\t} \r\n\tFallBack "Diffuse"\r\n}\r\n<\/pre>\n
—<\/p>\n
Image#2: Texture used for the plane, you can use any texture..<\/p>\n
\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"
Godrays shader on a plane texture.. since no RenderToTexturein indie. ( Converted to unity from this webgl shader) Should try it as a camera shader also.. Features: – Adjustable values: effect xy position, exposure, decay, density, weight, clamp,\u00a0 samples (screenshot is using 100 samples) Webplayer: […]<\/p>\n","protected":false},"author":1,"featured_media":1147,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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},"jetpack_post_was_ever_published":false},"categories":[4,3],"tags":[316,318,52,317,14,319],"class_list":["post-1146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-demos","category-unity3d","tag-god-rays","tag-godrays","tag-light","tag-ray","tag-shader","tag-shining"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/unitycoder.com\/blog\/wp-content\/uploads\/2012\/10\/fake_godrays_on_texture_plane.jpg?fit=680%2C414&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p1KTaT-iu","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1146","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=1146"}],"version-history":[{"count":9,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1146\/revisions"}],"predecessor-version":[{"id":3016,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1146\/revisions\/3016"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media\/1147"}],"wp:attachment":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media?parent=1146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/categories?post=1146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/tags?post=1146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}