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Left and Right Primitives
The notions of “left” and “right” which follow depend on context. If an auxiliary input is used, it is always the right primitive and the primary input geometry are all left primitives. If only one input is used, then for each pair being aligned, there is a left and a right primitive. This means that relative to neighboring primitives, one primitive can be both left and right.
Any geometry type. Treated as left/right primitive pairs or left primitives if an auxiliary source is used.
Any geometry type consisting of a single primitive treated as the “right” primitive.
Which primitives to align. If blank aligns entire input.
Which primitive to align to. If blank aligns to first primitive in the auxiliary input.
Can optionally align subgroups of N primitives or patterns of primitives.
Determines the pattern of primitives aligned.
This tab describes the main parameters for alignment.
Determines which primitive remains unaffected. 0 : first 1 : last.
Pivot location on the “left” primitive.
Pivot location on the “right” primitive.
Right UV End
If an auxiliary input is used, this location specifies an endpoint for the alignment. Primitives are distributed uniformly between the Right UV and the Right UV End.
Causes each primitive in the group to be aligned. If off, only the first primitive is aligned and all others are placed relative to it.
Translates primitives during alignment.
Rotates primitives during alignment.
This tab describes the post-alignment transformation in the local alignment space.
Order in which transformations occur.
Order in which rotations occur.
Amount of translation along local xyz axes.
Amount of rotation about local xyz axes.
Non-uniform scaling along local xyz axes.
Local pivot point for transformations.
This example demonstrates how the UV information on surfaces, NURBS in this example, are used by the Align SOP to orient one object to another’s surface.
UV reference parameters in the Align SOP can be animated as shown in the align_tube example.
Animating UV parameters leads to the translation and rotation of the aligned geometries along one another’s surface in various ways.