projectIntoHeight: Chops a polygon at two different heights.

In tunelipt/model3d: Funções para manipulação de modelos 3D.

Description

Given a polygon and two levels, this function chops the polygon, returning a polygon that is the intersection between the original polygon and a strip from the lower height to the upper height. If there is not intersection this function returns NULL. The height can be any coordinate axis: x -> 1, y -> 2 and z -> 3 (default).

Usage

  projectIntoHeight(p, hmin, hmax, dnum = 3)

Arguments

p	Polygon, a matrix where the rows are x, y, z coordinates of the vertices.
hmin	Minimum height to chop the polygon.
hmax	Maximum height to chop the polygon.
dnum	Axis along which the heights are defined.

Value

Chopped polygon or NULL if there is no intersection.

tunelipt/model3d documentation built on Nov. 5, 2019, 10:59 a.m.