What does prim mean dictionary?ġa : stiffly formal and proper : decorous. This Latin root is the word origin of a good number of English words, such as prime, primitive, and primate. If Copy Contents Into Editable Layer is on, the node applies these additional transforms directly to the imported primitives, otherwise the node creates a new active layer and puts the transforms in the new layer as overrides.The Latin root word prim which means “first” is an important contributor to the English language. This ensures that the final world space location of the prim in LOPS will be the same as it was in SOPs. If the prim (or its ancestors) already exist on the input stage, the node inverts the transformations of the ancestor prims, and applies them as additional local transformations on the prim. When this parameter is on (the default), the node examines every transformation imported from SOPs, in the context of the prim’s location in the scene graph hierarchy. This results in an incorrect double-application of the transforms. This creates a problem if you then “round-trip” the SOP packed primitive back into LOPs, as the descendants will have their own transforms, which are also now incorporated into the root prim’s transform imported from SOPs. If you export a USD geometry primitive to SOPs as a packed USD primitive, Houdini flattens the full transformation hierarchy under the USD prim into a single transformation matrix. Packed Primitives in SOPs only have a single transform, representing the full local-to-world transformation of the packed geometry. If you know you are not round-tripping LOPs → SOP packed USD primitives → LOPs, you can turn this off to make importing faster. (When Load as reference is off.) When this is on (the default), the node automatically compensates for transform problems created if you round-trip geometry from LOPs to SOPs (as packed USD primitives) and then back to LOPs again. In the SOP Create node’s parameters, set the Import path prefix.Īny geometry that doesn’t have a path attribute is given a generated name (for example, all polygons go into a mesh prim named something like mesh_0), and put under this prim path.Īny geometry with a relative path attribute value is prefixed with this prim path. In the network editor, press U to go back up to the LOP network. If you don’t have an Output node in the subnet, it uses whatever node has the display flag. The Output node is used as the output for the subnetwork. Geometry subsets are useful for assigning materials to groups of faces.)Įnd the geometry network with an Output SOP. (The SOP Create node can also create USD geometry subsets based on SOP string attributes and/or groups. Remember that for polygons, all faces you want to be part of the same USD mesh prim must have the same value in their path attribute. If you specify a relative path (doesn’t start with /), the value is appended to the SOP Create node’s Import path prefix parameter. In the network editor, double-click the SOP Create node to go inside to the SOP subnet.Īs you develop the geometry, you can add path string attributes to SOP primitives to specify where they should appear in the USD scene graph tree when imported.
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