Fix splines becoming linear when duplicated.

POV-Ray / povray

The Persistence of Vision Raytracer: http://www.povray.org/

GNU Affero General Public License v3.0

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Fix splines becoming linear when duplicated. #426

Closed c-lipka closed 3 years ago

c-lipka commented 3 years ago

When used in spline { SPLINE_IDENTIFIER ... } without explicitly specifying spline type again, the new copy would get demoted to linear_spline (see newsgroup post <XnsAD687938A665Aseed7@news.povray.org>, 2021-07-15, povray.beta-test, "spline in, out array bug").