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specifying color in WriteToSVG and WriteToPNG

1

Would it be possible to specify stroke color in the `WriteToSVG` and `WriteToPNG` functions (to change [this line](https://github.com/fogleman/ln/blob/master/ln/path.go#L107) and [this line](https://github.com/fogleman/ln/blob/master/ln/path.go#L167), respectively)? Would be happy to submit a PR if...

transcranial

Optimization for intersections on Triangle

1

There is an optimization you can make for you Triangle type, though it sort of prevents using Triangle literals. ``` type Triangle struct { V1, V2, V3 Vector Box Box...

yarbelk