Kosta/fix index creation (fix for #13)

[Kosta-Github]

This is a potential fix for #13

[mourner]

Thanks! Looks good to me. I'll now check if we can avoid getting vertex length on each vertex twice, and calculate dimensionality once instead...

[Kosta-Github]

how about this?

[Kosta-Github]

you could also make the number of dimensions variable (but the same for all vertices) and not just limiting it to 2 and 3 by explicitly using node.p.length for dim and not clamp it to 3. then you could replace https://github.com/mapbox/earcut/blob/master/src/earcut.js#L170-L172:

        vertices.push(node.p[0]);
        vertices.push(node.p[1]);
        if (node.p.length > 2) vertices.push(node.p[2]);

by

    vertices.concat(node.p);

[mourner]

concat produces a new array, so it's slow.
Looks good now. Do you think there are use cases that require more than 3 dimensions?

[Kosta-Github]

ah yeah, right about concat...

I could imagine to store additional data with the vertices, such as normals, colors, uv-coordinates for texture mapping, and then use interleaved buffer arrays for that data to render it with WebGL...

But leaving that out for now works for me. If/when I have a concrete use case for that I can create another PR...

[mourner]

Published in 1.4.0. Also fixed the code to work with any number of dimensions.