ref: 3155c6737832c54310c70ecaaf8667d0362de5e8
dir: /model.6.txt/
p x y z [w]
n x y z
t u v
c r g b [a]
v pᵢ [nᵢ|-] [tᵢ|-] [cᵢ|-]
T x y z
prim nverts vᵢ... [Tᵢ|-] [mtlname]
mtl name {
ambient: r g b [a]
diffuse: r g b [a]
specular: r g b [a]
shininess: n
diffusemap: path
specularmap: path
normals: path
}