Basit 3-d spiraller için, üçüncü değişken,h (yükseklik) deθ açısının tekdüze bir sürekli fonksiyonudur. Örneğin, bir koniksarmal bir konik yüzey üzerinde, apexe mesafesiθnın üstel bir fonksiyonu olan bir spiral olarak tanımlanabilir.
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