{"id":121,"date":"2010-01-25T17:23:13","date_gmt":"2010-01-25T15:23:13","guid":{"rendered":"http:\/\/euqahuba.com\/blog\/?p=121"},"modified":"2013-01-17T12:34:24","modified_gmt":"2013-01-17T10:34:24","slug":"slice-and-plot-my-scanline","status":"publish","type":"post","link":"https:\/\/euqahuba.com\/blog\/?p=121","title":{"rendered":"Slice and plot my scanline!"},"content":{"rendered":"

\"Slice<\/p>\n

Slice and plot scanlines in Nuke!<\/p>\n


\nI’ve been playing with the expression node in Nuke lately, and one of the things I made was \u00a0a simple Slice tool\/scanline plotter<\/strong>. It can sample a slice (between two points) and will plot the color values as a curve over the image.<\/p>\n

I’ve wrapped it up in a group with a set of exposed parameters, but not exported as a gizmo, just because it might be handy to just copy\/pasta it into your\u00a0scripts<\/strong> somewhere \u00a0without the need to embed it into a pipeline.<\/p>\n

It has three modes, per pixel which is checking the raw pixels, and a sample area which is similar to the per pixel method but it can sample a larger area pr pixel as well. (using the ex: \u00a0r(x,y,5,5)<\/strong> function) and one that will use the first point to determine which full scanline to sample and plot.<\/p>\n

Maybe someone will find it usefull, maybe someone will……….buy me a beer….<\/strong><\/p>\n


\nset cut_paste_input [stack 0]
\nversion 6.1 v1
\npush $cut_paste_input
\nGroup {
\n name PlotScanline
\n selected true
\n xpos -839
\n ypos 206
\n addUserKnob {20 Controls}
\n addUserKnob {4 mode l \"Sampling method\" M {\"Slice Per Pixel (faster)\" \"Slice Area (slower)\" \"Full Scanline\" \"\" \"\" \"\"}}
\n mode \"Full Scanline\"
\n addUserKnob {6 add2image l \"Add to original\" +STARTLINE}
\n add2image true
\n addUserKnob {6 Normalize -STARTLINE}
\n addUserKnob {6 tonemap l \"Tone Map (HDRI)\" -STARTLINE}
\n addUserKnob {6 curve l \"Plot as curve\" +STARTLINE}
\n curve true
\n addUserKnob {3 curveFat l \"Curve Thickness\" -STARTLINE}
\n addUserKnob {3 sa l \"Sample Area\" t \"Disabled when using pr pixel method.\"}
\n sa 1
\n addUserKnob {7 lift l Lift R -1 1}
\n addUserKnob {7 scale l Scale R 0 5}
\n scale 1
\n addUserKnob {26 \"\"}
\n addUserKnob {12 p1 l \"Start Point\"}
\n p1 {376 418}
\n addUserKnob {12 p2 l \"End Point\" -STARTLINE}
\n p2 {428.5 425.5}
\n addUserKnob {26 \"\"}
\n addUserKnob {26 \"\" l \"About \" T \"Plot Scanline v0.4 | theo@euqahuba.com\\nUse P1 to select your scanline and\/or you start slice.\"}
\n}
\n Input {
\n inputs 0
\n name Input1
\n xpos -480
\n ypos 62
\n }
\nset N3069610 [stack 0]
\n Expression {
\n temp_name0 length
\n temp_expr0 sqrt(r*r+g*g+b*b)
\n expr0 r\/length
\n expr1 g\/length
\n expr2 b\/length
\n name Normalize
\n xpos -480
\n ypos 108
\n disable {{1-parent.Normalize i}}
\n }
\n Expression {
\n expr0 r\/(r+1)
\n expr1 g\/(g+1)
\n expr2 b\/(b+1)
\n name tonamap
\n xpos -480
\n ypos 134
\n disable {{1-parent.tonemap i}}
\n }
\nset N7fe58a0 [stack 0]
\n Expression {
\n temp_name0 rExpr
\n temp_expr0 \"min(max(0,\\r\\nceil(r(x,parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name1 gExpr
\n temp_expr1 \"min(max(0,\\r\\nceil(g(x,parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name2 bExpr
\n temp_expr2 \"min(max(0,\\r\\nceil(b(x,parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n expr0 rExpr
\n expr1 gExpr
\n expr2 bExpr
\n expr3 0
\n name scanline
\n xpos -302
\n ypos 193
\n addUserKnob {20 User}
\n }
\npush $N7fe58a0
\n Expression {
\n temp_name0 rExpr
\n temp_expr0 \"min(max(0,\\r\\nceil(r((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y,parent.sa,parent.sa)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name1 gExpr
\n temp_expr1 \"min(max(0,\\r\\nceil(g((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y,parent.sa,parent.sa)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name2 bExpr
\n temp_expr2 \"min(max(0,\\r\\nceil(b((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y,parent.sa,parent.sa)-((y\/height+parent.lift)*parent.scale))),1)\"
\n expr0 rExpr
\n expr1 gExpr
\n expr2 bExpr
\n expr3 0
\n name Expression_highQuality
\n xpos -515
\n ypos 197
\n addUserKnob {20 User}
\n }
\npush $N7fe58a0
\n Expression {
\n temp_name0 rExpr
\n temp_expr0 \"min(max(0,\\r\\nceil(r((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name1 gExpr
\n temp_expr1 \"min(max(0,\\r\\nceil(g((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n temp_name2 bExpr
\n temp_expr2 \"min(max(0,\\r\\nceil(b((x\/width)*(parent.p2.x-parent.p1.x)+parent.p1.x,(x\/width)*(parent.p2.y-parent.p1.y)+parent.p1.y)-((y\/height+parent.lift)*parent.scale))),1)\"
\n expr0 rExpr
\n expr1 gExpr
\n expr2 bExpr
\n expr3 0
\n name perPixel
\n xpos -419
\n ypos 201
\n addUserKnob {20 User}
\n }
\n Switch {
\n inputs 3
\n which {{parent.mode i}}
\n name Switch2
\n xpos -480
\n ypos 253
\n }
\n Matrix {
\n matrix {
\n {0 1 0}
\n {1 -4 1}
\n {0 1 0}
\n }
\n name Matrix2
\n selected true
\n xpos -480
\n ypos 284
\n disable {{-1+parent.curve i x70 1}}
\n }
\n Dilate {
\n size {{parent.curveFat}}
\n name Dilate1
\n xpos -480
\n ypos 326
\n disable {{-1+parent.curve.main}}
\n }
\n Clamp {
\n name Clamp1
\n xpos -480
\n ypos 383
\n }
\nset N86e9e00 [stack 0]
\npush $N3069610
\n Dot {
\n name Dot1
\n xpos -556
\n ypos 66
\n }
\n Clamp {
\n maximum 331
\n name Clamp2
\n xpos -590
\n ypos 352
\n }
\n Merge2 {
\n inputs 2
\n operation plus
\n bbox intersection
\n name Merge1
\n xpos -590
\n ypos 394
\n }
\n Dot {
\n name Dot2
\n xpos -556
\n ypos 433
\n }
\npush $N86e9e00
\n Switch {
\n inputs 2
\n which {{parent.add2image i}}
\n name Switch1
\n xpos -480
\n ypos 425
\n }
\n Output {
\n name Output1
\n xpos -480
\n ypos 470
\n }
\nend_group<\/p>\n

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

Slice and plot scanlines in Nuke!<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4,5],"tags":[29,48,26,32,47,34],"class_list":["post-121","post","type-post","status-publish","format-standard","hentry","category-compositing","category-tips","category-tools-development","tag-compositing-2","tag-expression","tag-nuke","tag-nukex","tag-plot-scanline","tag-vfx"],"_links":{"self":[{"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=121"}],"version-history":[{"count":19,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/121\/revisions"}],"predecessor-version":[{"id":321,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/121\/revisions\/321"}],"wp:attachment":[{"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euqahuba.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}