The #attrsimilar function calculates similarity between a given
vector and vectors in the index. For example, you can use it to detect 3D parts with similar
shape or size.
#attrsimilar is a query node in the index, which returns all the documents
matching the similarity query and calculates the similarity measure. As it does not filter
search results at all, you must combine it with a #filter to return only the
documents having a similarity higher than a given threshold value.
Note:
Similarity is the inverse of distance and calculated as follows: similarity = 1 -
distance
Important:
The standard way to use #attrsimilar is inside a query
template. See Defining Query Templates.