get_matrix_for_element_type: Get a matrix of data to represent the given element type

In coolbutuseless/threed: Three-Dimensional Object Transformations

Description

'mesh3d' objects contain a matrix of vertices and matrix of vertex indicies to describe each element.

Usage

get_matrix_for_element_type(obj, element_type, all_vertices = NULL)

Arguments

obj	mesh3d object
element_type	single element type to extract. specify an integer 1:4
all_vertices	normalised matrix of all vertices. If NULL, then will be calculated within this call

Details

This function maps the vertex indices to the actual vertex coordinates and returns a matrix of information to represent each element of the requested type.

Value

numeric matrix representation of the given element type

• element_id - element index

• element_type - an integer from 1 to 4 indicating whether the element is a point, line, triangle or quad

• vorder - vertex ordering within element

• x,y,z - coorindates of vertex

• vertex - global index of this vertex

• vnx,vny,vnz - unit vector in direction of vertex normal

• fnx,fny,fnz - unit vector in direction of face normal

• fcx,fcy,fcz - coordinates of centroid of element

• zorder - zorder is used to control ggplot draw order. For polygons it is based upon fcz. For lines it is the smaller of the z coordinates. For points, it is the z coordinate of the point

• zorder_var - The value used to determine zorder

coolbutuseless/threed documentation built on May 5, 2019, 7:08 a.m.