catchyid Posted May 1, 2017 Share Posted May 1, 2017 Hi, http://www.sidefx.com/docs/houdini15.5/model/primitives I notice when I middle click on a SOP geometry (e.g. Sphere, Box,...) , I find the number of primitive equals the number of polygons, nurbs, volumes, etc. From the documentation, I understand that a primitive is like a super type that could further defined by sub types such as polygons, nurbs, volumes. My questions -would be always that the number of primitives equal the number of polygons/nurbs/vdb/? -why even bother mentioning the number of primitives? I am sure there is a difference between a primitive and its sub-type, but I don't have an example to show me the difference... Thanks Quote Link to comment Share on other sites More sharing options...
Guest tar Posted May 1, 2017 Share Posted May 1, 2017 try merging many types of primitive, i.e. points, packed, meshes and nurbs. Let us know what you find! Quote Link to comment Share on other sites More sharing options...
catchyid Posted May 1, 2017 Author Share Posted May 1, 2017 Yes Sir Well, I did couple tests as you suggested and the only difference I see is that "primitive" specifies the total number of "geometrical units" in the node, and it's further classified as sub geometrical units : polygons, nurbs, VDBs, etc. Meaning, there could 3 "primitives" = 1 "VDB" + 1 "Nurb" + 1 "Polygon". Quote Link to comment Share on other sites More sharing options...
Guest tar Posted May 1, 2017 Share Posted May 1, 2017 oh - that sounds strange - here's a test that shows 288 polys, 1 pack, 1 nurbs and 290 prims. ManyPrims.hiplc Quote Link to comment Share on other sites More sharing options...
catchyid Posted May 1, 2017 Author Share Posted May 1, 2017 Why it's strange? As far as I understand it, it says: there are 290 primitives ("geometrical units" using Houdini Docs), which are broken down as : 288 polygons + 1 Nurb + 1 Packed Geo (total is 290, which is the same number of primitives) ? Quote Link to comment Share on other sites More sharing options...
Guest tar Posted May 1, 2017 Share Posted May 1, 2017 A primitive is a 1st order summation whilst the next is a second order. i.e. more detail. I guess I'm not understanding the original question. Quote Link to comment Share on other sites More sharing options...
catchyid Posted May 1, 2017 Author Share Posted May 1, 2017 I don't understand your definition of 1st order and 2nd order I think I got my own little definition of primitives here, I will stick with it until I find a situation where it's broken, then I will ask more specific questions Thank you for your help and time Marty Quote Link to comment Share on other sites More sharing options...
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