Optional channel to river reachs option
The way ICM identifies the centre-line of the river reach is by using the point with the lowest invert level. Regardless of the shape of the channels of how much is the value of the X coordinate, didn't affect the appearance of the section to generate, I hope to be able to add a function, can recognize the center line of the river, and the X coordinate is used to define a mapping point distance from the centerline of the channel of the (negative value on behalf of the center line on the left side of the river, when the right), resulting in river section.
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Liu Qiusheng
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