{"id":1082,"date":"2026-02-20T16:59:17","date_gmt":"2026-02-21T00:59:17","guid":{"rendered":"http:\/\/fx-td.com\/houdiniandchill\/?p=1082"},"modified":"2026-02-20T17:08:25","modified_gmt":"2026-02-21T01:08:25","slug":"archived-post-by-ogvfx-4","status":"publish","type":"post","link":"http:\/\/fx-td.com\/houdiniandchill\/2026\/02\/20\/archived-post-by-ogvfx-4\/","title":{"rendered":"Archived post by ogvfx"},"content":{"rendered":"
\n

This is something I learned at dreamworks awhile back to do pscale to pixel calulations from camera.
\nit creates a uv on the particles coming in on the second input then used the cameras info to calculate the pscale at a pixel level.
\n“`\/\/get camera details float aperture = chf(“aperture”); \/\/ ch(chsop(“..\/camera”) + “\/aperture”) float focal = chf(“focal”);’ \/\/ ch(chsop(“..\/camera”) + “\/focal”) float resolution = chf(“resolution”); \/\/ ch(chsop(“..\/camera”) + “\/resx”)+1 \/ 1 float pixel_width = chf(“pixel_width”); \/\/ ch(“..\/paticle_pixel_size”) \/\/ this gets used to increase or decrease based on a pixel default of 1 is set to 1 pixel
\n\/\/get uv camera vector camUV = point(1,”uv”,@ptnum);
\nfloat uvZ = camUV.z;
\n \/\/calculate camera scale
\nfloat cameraScale = (aperture\/focal\/resolution) ;<\/p>\n

\/\/set new pscale if(ch(“..\/pscale_operation”)==0) f@pscale<\/a> = uvZ * cameraScale * (pixel_width*.5);
\n\/\/multiply pscale
\nif(ch(“..\/pscale_operation”)==1) f@pscale<\/a> *= uvZ * cameraScale * (pixel_width*.5); “`<\/p>\n

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This is something I learned at dreamworks awhile back to do pscale to pixel calulations from camera. it creates a uv on the particles coming in on the second input then used the cameras info to calculate the pscale at a pixel level. “`\/\/get camera details float aperture = chf(“aperture”); \/\/ ch(chsop(“..\/camera”) + “\/aperture”) float … Continue reading Archived post by ogvfx<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/posts\/1082"}],"collection":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/comments?post=1082"}],"version-history":[{"count":0,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/posts\/1082\/revisions"}],"wp:attachment":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/media?parent=1082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/categories?post=1082"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/tags?post=1082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}