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 > >
