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mapbox / earcut

The fastest and smallest JavaScript polygon triangulation library for your WebGL apps
ISC License
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Update readme to clarify if vertices are output in clockwise or counterclockwise order. #156

Open ILOVEPIE opened 2 years ago

ILOVEPIE commented 2 years ago

I'm trying to use this in a project and haven't been able to determine which order the vertices are being output. It seems to be clockwise but I'm getting some weird behavior.

Giwayume commented 1 year ago

Clockwise or counter-clockwise depends on your coordinate space.

ILOVEPIE commented 1 year ago

Can you be more specific.

Giwayume commented 1 year ago

In a coordinate system where -y is pointed up, a clockwise check for a set of points forming a polygon will be the opposite from a coordinate system where +y is pointed up.

ILOVEPIE commented 1 year ago

I’m talking about with the default open GL coordinate system. On Mon, Dec 26, 2022 at 3:41 PM Giwayume @.***> wrote:

In a coordinate system where -y is pointed up, a clockwise check for a set of points forming a polygon will be the opposite from a coordinate system where +y is pointed up.

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