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The Duplicate OP is a simpler but faster version of the Copy node:
Copying onto a template is not supported.
Copies are appended to the source geometry, not extracted.
Duplicate is much faster than Copy because it’s less complex.
A subset of input primitives to copy from.
Number of copies
The number of copies to be made.
Each copy is transformed relative to the previous.
Order transformations occur.
Order rotations occur.
Translation along xyz axes.
Rotation about xyz axes.
Non-uniform scaling along xyz axes.
Amount of shearing. The three values represent X on XY plane, X on XZ plane, and Y on YZ plane respectively.
The local pivot point of the copy.
Preserve Normal Length
Normals to maintain length after transformations.
Create Output Groups
Places each copy into a primitive group.
Don’t delete the contents of the copy group if it already exists before adding the copied primitives.
The name of the group to create for each copy.
The copy number.
The number of copies.
The following variables refer to the input geometry.
CEX, CEY, CEZ
The centroid of the entire input geometry.
GCX, GCY, GCZ
The centroid of the input group.
The X extents of the bounding box of the geometry.
The Y extents of the bounding box of the geometry.
The Z extents of the bounding box of the geometry.
SIZEX, SIZEY, SIZEZ
The size of the bounding box.
BBX, BBY, BBZ
The point’s relative position in the bounding box.
The Duplicate SOP, in this example, is used to create multiple iterations of a box geometry with each copy scaled and offset cumulatively. Expressions using copy number $CY may be used to control each iteration’s parameters.