It can contain lights, cameras, and entire geometry hierarchies. abc As we all know, Alembic archives are a complete scene level format used to capture the entire scene to be lit and rendered out. ![]() Scene Level Exports: Use the ROP Alembic Output Driver SOP. It does not support volumes, NURBs, Beziers or anything else for that matter. This supports a limited subset of geometry from polygons and even better polysoup type primitives, Catmul-Clark Rendderman type subdivided meshes, points, open curves such as hair wires. Use the Name SOP along with partitioning of the geometry to add archive information. Use this to export your geometry as a single flat alembic archive. Better to use the Alembic Output Driver SOP imho. Careful as this is NOT how you support round-tripping of alembic archives. This supports polygons, open and closed curves, NURBs curves and surfaces along with Bezier curves and surfaces.abc > Alembic geometry can be cached directly from a SOP. It is very limited.dxf > AutoCAD's default Data eXchange Format. I personally don't use this export option. Best if you flatten everything to the XY plane as well. Keep things to Bezier and NURBs closed faces and simple polygon shapes. ai for Adobe Illustrator but this variant has limited geometry support. obj, only polygons are supported.eps and. It's best to strip out everything and keep only polygons and NURBs surfaces for this export type.lw > Lightwave's polygon format. It is a bastardized extended format with hundreds of different variants. You can use the Delete SOP as it has a menu to choose polygons only and then enable delete non-selected to keep the polygons but trash everything else.iges > an ancient cad format that still keeps on going. Only polygon data is supported so make sure you delete everything but polygons. ![]() If you do have a mixed bag of geometry in your SOP chain, use a Delete SOP and set Geometry Type to “VDB” and set Operation to “Delete Non-Selected” to keep any and all VDB type geometry.obj > Wavefront's ancient obj format but it is still widely supported. Please remove any and all other primitive types from the target SOP you wish to output from. Note that this ONLY supports VDB grids/volumes. All primitive types are supported.vdb > OpenVDB volume format export extension. Just wire it in the network, select the appropriate file extension and go. SOP level geometry exports Geometry Exports: Use the ROP Output Driver SOP for formally exporting geometry to 3rd party applications. Only caveat is that FBX is only accessible from /out using the FBX ROP Render OutPut node. If you are not utilizing a farm to process scenes you can safely export your scene date directly from SOPs. You also have a choice as to whether you cache with nodes in the SOP geometry context or from the /out Output context. ![]() You can have as many export locations as you want. You can separate them if you wish using Ctrl-Click to set the Render flag. That is why you have a Display and Render flag on SOPs. Caching Geometry/Simulations for export to other applications or to Houdini/Mantra: It's up to you to determine where in the SOP geometry chain you wish to export from. At least that is the strategy I try to use. You have to be very careful to make sure only the primitives that are supported are contained in the geometry. You “could” absolutely use a File Cache SOP to generate export geometry for use in other software packages but that is not the intention. But this node isn't generally intended to create geometry to transfer over to other applications. It tries it's best in Automatic mode to make sure files on disk remain up to date and not overwritten if not necessary. It can both write and read geometry to disk. This File Cache SOP is used in many shelf tool set-up. Caching Simulations for re-working: When you are doing a large simulation, it is common to cache the raw results of the simulation in geometry SOPs using the File Cache SOP. Only exception is the File SOP wrapped up in the very useful File Cache SOP. The various SOPs used for exporting invariably are wrappers around various ROP types. The only exception is the File > Export > Alembic or FBX options from the menu but I would recommend not to use this option and to learn to use either an Alembic ROP or an FBX ROP to export parts or all of your scene. Houdini is very different from other apps in that you invariably use a Node of type ROP for Render Output Driver to export geometry. And getting the correct file extension is critical to success. ![]() It can be confusing when to cache and what file formats to generate.
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