我知道如何检查一个点是否在二维线上,但我想在三维中做到这一点。有什么想法吗?
// slope from point 1 to point 3
var p13:Number = (Math.atan2 (end.x - start.x, end.y - start.y)) * toDegrees;
// slope from point 1 to point 2 -- matches?
var p12:Number = (Math.atan2 (point.x - start.x, point.y - start.y)) * toDegrees;
return Math.round(p12) == Math.round(p13);