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sample.py

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import sys

import tinyobjloader

filename = "../models/cornell_box.obj"

reader = tinyobjloader.ObjReader()

# Load .obj(and .mtl) using default configuration

ret = reader.ParseFromFile(filename)

# Optionally you can set custom `config`

# config = tinyobj.ObjReaderConfig()

# config.triangulate = False

# ret = reader.ParseFromFile(filename, config)

if ret == False:

print("Failed to load : ", filename)

print("Warn:", reader.Warning())

print("Err:", reader.Error())

sys.exit(-1)

if reader.Warning():

print("Warn:", reader.Warning())

attrib = reader.GetAttrib()

print("attrib.vertices = ", len(attrib.vertices))

print("attrib.normals = ", len(attrib.normals))

print("attrib.texcoords = ", len(attrib.texcoords))

# vertex data must be `xyzxyzxyz...`

assert len(attrib.vertices) % 3 == 0

# normal data must be `xyzxyzxyz...`

assert len(attrib.normals) % 3 == 0

# texcoords data must be `uvuvuv...`

assert len(attrib.texcoords) % 2 == 0

for (i, v) in enumerate(attrib.vertices):

print("v[{}] = {}".format(i, v))

for (i, v) in enumerate(attrib.normals):

print("vn[{}] = {}".format(i, v))

for (i, v) in enumerate(attrib.texcoords):

print("vt[{}] = {}".format(i, t))

print("numpy_vertices = {}".format(attrib.numpy_vertices()))

materials = reader.GetMaterials()

print("Num materials: ", len(materials))

for m in materials:

print(m.name)

print(m.diffuse)

print(m.diffuse_texname)

# Partial update(array indexing) does not work

# m.diffuse[1] = 1.0

# Update with full object assignment works

m.diffuse = [1, 2, 3]

print(m.diffuse)

# print(m.shininess)

# print(m.illum)

shapes = reader.GetShapes()

print("Num shapes: ", len(shapes))

for shape in shapes:

print(shape.name)

print("len(num_indices) = {}".format(len(shape.mesh.indices)))

for (i, idx) in enumerate(shape.mesh.indices):

print("[{}] v_idx {}".format(i, idx.vertex_index))

print("[{}] vn_idx {}".format(i, idx.normal_index))

print("[{}] vt_idx {}".format(i, idx.texcoord_index))

print("numpy_indices = {}".format(shape.mesh.numpy_indices()))

print("numpy_num_face_vertices = {}".format(shape.mesh.numpy_num_face_vertices()))

print("numpy_material_ids = {}".format(shape.mesh.numpy_material_ids()))