The function will only take 3, 5 or 7 input arguments. The last argument should be a char string referring to the filename of the OBJ file, whereas the first 2, 4, or 6 input arguments should be 2-dimensional matrices containing the elements of the triangular mesh in the following order:

v can be either an $N\times 3$ matrix with x,y,z vertex coordinates or an $N\times 6$ matrix containing the vertex coordinates and the r,g,b color information for each vertex in the range $[0,1]$.

f must be an $M\times 3$ matrix with the indices of each corresponding vertex, where $M$ is the number of faces.

vt must be an $N\times 2$ matrix, where $N$ is the number of texture coordinates.

ft must be an $M\times 3$ matrix with the indices of each corresponding texture coordinates.

vn must be an $N\times 3$ matrix with x,y,z normal coordinates, where $N$ is the number of normals.

fn must be an $N\times 3$ matrix with the indices of each corresponding face normal.

If 5 input arguments are provided, the function will determine whether there is a texture coordinates matrix or a vertex normals matrix by the size of the second dimension of the matrix provided as the third input argument.

See also: readObj, renameObj

Source Code: writeObj