pp. 297-299). Various definitions of offset curves exist. The predominant definition, however, is one based on a centerline or "generator" curve with an offset a distance w defined along a unit normal to each point of the centerline curve. In the absence of a sign convention for the unit normal, an offset curve is defined on both sides of the centerline curve. Generally, the term "left offset curve" designates the offset curve based upon a unit normal given by a positive sign, while the term "right offset curve" designates the offset curve based upon a unit normal by the negative sign. Further, the term "offset curve" is used to refer to one or the other of the left and right offset curves, while the term "offset curve pair"Australian bushfire smoke has made it's way to New Zealand as snowy white glaciers are turned to brown slush.

Icy white glaciers on New Zealand’s South Island have turned a concerning shade of caramel as a result of the bushfires burning in New South Wales and Victoria.

Shocking photographs and videos shared on social media over the past 48 hours show the impact of the drifting smoke on some of the country’s magnificent and usually pristine attractions.

“We can actually smell the burning here in Christchurch,” a user by the name of Miss Roho said on Twitter overnight.

She shared a video of the thick smoke up on the Tasman Glacier in Mount Cook National Park, 200 kilometres west of the South Island city.

This the view from the top of the Tasman