readobj: Read a Wavefront OBJ 3D scene file into a tri-mesh

In changebio/MAGPA: Multivariate Analysis of Genotype–Phenotype Association and Visualization for 3D Image

Description

This function reads a OBJ file, which a file format that is commonly used in 3D graphics applications. It does not represent text, but does represent points, lines, polygons.

Usage

readobj(obj.file, mesh = TRUE)

Arguments

obj.file	Path to an OBJ file
mesh	boolean, construct tri-mesh? the default is TRUE

Value

a named list with items shapes and materials, each containing sublists with one entry per object (shapes) or material (materials). Objects in the shapes list have the following structure

• positions 3xN set of 3D vertices

• normals 3xN set of normal directions for each vertex (has 3 rows and 0 cols when normals are not available)

• texcoords vector containing unprocessed texture coordinates

• indices 3/4xM set of indices into vertex array (trimesh/quadmesh) 0-indexed

• material_ids (0-indexed, -1 when not set)

Examples

data(refface)
ref.m <- refface$ref.m
obj.file <- tempfile(fileext = '.obj')
writeobj(obj.file, ref.m)
ref.m <- readobj(obj.file)

changebio/MAGPA documentation built on June 15, 2020, 9:26 p.m.