Hi Rémi, Look here for some details on user data, specifically the literal data types:
http://www.lamrug.org/resources/userdatatips.html The two tag numbers are the "magic" numbers mentioned in the ShowEdges examples, they are unique ID numbers used between SI UserDataBlob and MR User Data to assign the correct data block from SI to the shader of Mental Ray. Daniel On Tue, Aug 14, 2012 at 9:58 AM, Rémi ARQUIER <arqu...@gmail.com> wrote: > While investigating how to pass per primitive data from Softimage to MR, I > found in a simple .mi archive those interesting user data associated to > leaf box instances, present only when the object is split into several leaf > instance boxes : > > data "sphere/Polygon Mesh_TriLinkUD(0)" tag 7482834 > 1600 [ > some long hexa data here > ] > > and also : > > data "sphere/Polygon Mesh_PropDescUD(0)" tag 7482835 > 1600 [ > some hexa data here > ] > > Regarding the name of thoses user data I suppose they are put by the > translator for shaders, maybe they keep a track of the original polygon > indexes and the final boxes triangles indexes ? If yes I could use them to > map my user data of a simple UserDataBlob to final boxe's triangles. > > Anyone know how to interpret thoses data ? I didn't find anything in > <xsi_miuserdata_defs.h> about tags 7482834 and 7482835 > > thanks :) > > > 2012/8/13 Rémi ARQUIER <arqu...@gmail.com> > >> Hi all, >> >> I would like to compute some per primitive data in Softimage and get it >> back in a mental ray custom shader. I successfully tried the per object >> data using UserDataBlob and a custom Operator + mi_query + miQ_INST_DATA (I >> used the well documented ShowEdges example of the SDK documentation). But >> now I would need *per triangle data*, if possible using the same way as the >> ShowEdges example, i.e : with a custom OP. >> >> The UserDataMap and the mi_query + miQ_PRI_DATA look goods but I didn't >> find any example. >> >> Any ideas / links ? >> >> Many thanks >> >> Rémi Arquier >> >> >
