From @trzanko ray sop or prim uv’s don’t yield super great accuracy, as it only interpolates among a primitive’s points, to get a smooth position you can leverage the osd vex functions
\nhere’s my subdiv ray snippet which illustrates this, you can see the diff between the osd pos and the primuv pos if you comment out the line which declares the variable sDP
\n“`int primNum; vector UV;
\nfloat dist = xyzdist( 1, @P, primNum, UV);
\nvector restN = primuv(1,”N”,primNum,UV); vector posOnRest = primuv(1,”P”,primNum,UV);
\n\/\/subdiv float pU, pV; int pId; int patch = osd_lookuppatch( 1, primNum, UV.x, UV.y, pId, pU, pV);
\n\/\/these two functions return the last argument \/\/so posOnRest is being overwritten in the function, much like xyzdist() int sDN = osd_limitsurface( 1, ‘N’, pId, pU, pV, restN); int sDP = osd_limitsurface( 1, ‘P’, pId, pU, pV, posOnRest);
\n@P = posOnRest;“`<\/p>\n
posting Tighe’s post for re-gemming<\/p>\n","protected":false},"excerpt":{"rendered":"
From @trzanko ray sop or prim uv’s don’t yield super great accuracy, as it only interpolates among a primitive’s points, to get a smooth position you can leverage the osd vex functions here’s my subdiv ray snippet which illustrates this, you can see the diff between the osd pos and the primuv pos if you … Continue reading Archived post by Bender<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/posts\/412"}],"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=412"}],"version-history":[{"count":0,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/posts\/412\/revisions"}],"wp:attachment":[{"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/media?parent=412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/categories?post=412"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/fx-td.com\/houdiniandchill\/wp-json\/wp\/v2\/tags?post=412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}