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create_double_cubes_engravings.py
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create_double_cubes_engravings.py
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import vtk
import sys
import cv2 as cv
import numpy as np
import triangle
import os
from PIL import Image
from pathlib import Path
def load_file(file):
reader = vtk.vtkOBJReader()
input_poly = vtk.vtkPolyData()
reader.SetFileName(str(file))
reader.Update()
input_poly.ShallowCopy(reader.GetOutput())
return input_poly
def export_decimated_poly(poly, file_name):
with open(file_name, 'w+') as f:
for i in range(poly.GetNumberOfPoints()):
p = [0, 0, 0]
poly.GetPoint(i, p)
# vertices.append(p)
f.write("v %f %f %f\n" % (p[0], p[1], p[2]))
for i in range(poly.GetNumberOfPolys()):
face = poly.GetCell(i).GetPointIds()
# faces.append([face.GetId(0), face.GetId(1), face.GetId(2)])
f.write("f %d %d %d\n" % (face.GetId(0) + 1, face.GetId(1) + 1, face.GetId(2) + 1))
def vtk_render(object, axes_loc=[0, 0, 0]):
colors = vtk.vtkNamedColors()
transform = vtk.vtkTransform()
transform.Translate(axes_loc[0], axes_loc[1], axes_loc[2])
axes = vtk.vtkAxesActor()
# The axes are positioned with a user transform
axes.SetUserTransform(transform)
# properties of the axes labels can be set as follows
# this sets the x axis label to red
# axes.GetXAxisCaptionActor2D().GetCaptionTextProperty().SetColor(colors.GetColor3d('Red'));
# the actual text of the axis label can be changed:
# axes->SetXAxisLabelText('test');
cylinderMapper = vtk.vtkPolyDataMapper()
cylinderMapper.SetInputConnection(object.GetOutputPort())
# The actor is a grouping mechanism: besides the geometry (mapper), it
# also has a property, transformation matrix, and/or texture map.
# Here we set its color and rotate it -22.5 degrees.
cylinderActor = vtk.vtkActor()
cylinderActor.SetMapper(cylinderMapper)
cylinderActor.GetProperty().SetColor(colors.GetColor3d("Tomato"))
# cylinderActor.RotateX(30.0)
# cylinderActor.RotateY(-45.0)
# Create the graphics structure. The renderer renders into the render
# window. The render window interactor captures mouse events and will
# perform appropriate camera or actor manipulation depending on the
# nature of the events.
# Set the background color.
bkg = map(lambda x: x / 255.0, [26, 51, 102, 255])
colors.SetColor("BkgColor", *bkg)
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
ren.AddActor(cylinderActor)
ren.AddActor(axes)
ren.SetBackground(colors.GetColor3d("BkgColor"))
renWin.SetSize(300, 300)
renWin.SetWindowName('CylinderExample')
# This allows the interactor to initalize itself. It has to be
# called before an event loop.
iren.Initialize()
# We'll zoom in a little by accessing the camera and invoking a "Zoom"
# method on it.
# ren.ResetCamera()
# ren.GetActiveCamera().Zoom(1.5)
renWin.Render()
# Start the event loop.
iren.Start()
def merge_cube_and_pattern(cube, extrusion):
cube_tri = vtk.vtkTriangleFilter()
cube_tri.SetInputData(cube)
# define a y-rotation and translation transformer (moves and rotates engraving on cube face)
theta = np.random.uniform(0, 360)
translate_x = np.random.uniform(-0.9, 0.9)
translate_y = np.random.uniform(-0.9, 0.9)
trans = vtk.vtkTransform()
trans.Translate(translate_x, 0, translate_y)
rot = vtk.vtkTransform()
rot.RotateY(theta)
rot.Concatenate(trans)
transformer = vtk.vtkTransformPolyDataFilter()
# apply transformation to extruded pattern
transformer.SetInputData(extrusion)
transformer.SetTransform(rot)
transformer.Update()
# vtk_render(transformer, [0, 0.1, 0])
extrude_tri = vtk.vtkTriangleFilter()
extrude_tri.SetInputData(transformer.GetOutput())
# apply boolean difference opration to obtain engraving from extruded pattern + cube
booleanOperation = vtk.vtkBooleanOperationPolyDataFilter()
booleanOperation.SetOperationToDifference()
# booleanOperation.SetOperationToUnion()
# booleanOperation.SetOperationToIntersection()
booleanOperation.SetInputConnection(0, cube_tri.GetOutputPort())
booleanOperation.SetInputConnection(1, extrude_tri.GetOutputPort())
booleanOperation.Update()
# vtk_render(booleanOperation, [0, 0.1, 0])
return booleanOperation
def make_cube_two_sided(files, output):
"""
engraves cube with two patterns
:param files:
:param output:
:return:
"""
other_dice_side = np.random.randint(0, 5)
cube = vtk.vtkCubeSource()
# centered cube with sides = 3
cube.SetXLength(3)
cube.SetYLength(3)
cube.SetZLength(3)
# cube center is moved, and y side is now at 0.1 (extrude is between 0 and 0.2 in y)
cube.SetCenter(0, -1.4, 0)
cube.Update()
extrude1 = load_file(files[0])
extrude2 = load_file(files[1])
result = merge_cube_and_pattern(cube.GetOutput(), extrude1)
# translate->rotate->translate structure for second engraving
dice_rot = vtk.vtkTransform()
dice_trans_forward = vtk.vtkTransform()
dice_trans_backward = vtk.vtkTransform()
dice_trans_forward.Translate(0, 1.4, 0)
dice_trans_backward.Translate(0, -1.4, 0)
# dice_rot.RotateX(90)
if other_dice_side == 0:
theta = np.array(90)
dice_rot.RotateX(theta)
elif other_dice_side == 1:
theta = np.array(180)
dice_rot.RotateX(theta)
elif other_dice_side == 2:
theta = np.array(270)
dice_rot.RotateX(theta)
elif other_dice_side == 3:
theta = np.array(90)
dice_rot.RotateZ(theta)
elif other_dice_side == 4:
theta = np.array(-90)
dice_rot.RotateZ(theta)
# apply transformation to engraved cube
dice_rot.Concatenate(dice_trans_forward)
dice_trans_backward.Concatenate(dice_rot)
transformer = vtk.vtkTransformPolyDataFilter()
transformer.SetInputData(result.GetOutput())
transformer.SetTransform(dice_trans_backward)
transformer.Update()
#########
result = merge_cube_and_pattern(transformer.GetOutput(), extrude2)
# apply random rotation to result in all axis to avoid aligned dataset
theta = np.random.uniform(0, 360, size=3)
rot_x = vtk.vtkTransform()
rot_x.RotateX(theta[0])
rot_y = vtk.vtkTransform()
rot_y.RotateY(theta[1])
rot_z = vtk.vtkTransform()
rot_z.RotateZ(theta[2])
rot_x.Concatenate(rot_y)
rot_x.Concatenate(rot_z)
transformer.SetInputData(result.GetOutput())
transformer.SetTransform(rot_x)
transformer.Update()
# use result only if number of faces meets criterion
num_of_faces = transformer.GetOutput().GetNumberOfPolys()
featureEdges = vtk.vtkFeatureEdges()
featureEdges.FeatureEdgesOff()
featureEdges.BoundaryEdgesOff()
featureEdges.NonManifoldEdgesOn()
featureEdges.SetInputData(transformer.GetOutput())
featureEdges.Update()
non_manifold_edges = featureEdges.GetOutput().GetNumberOfCells()
if non_manifold_edges == 0:
if 100 < num_of_faces < 1600:
export_decimated_poly(transformer.GetOutput(), output)
return True
else:
print("rejected mesh because num of faces={}:".format(num_of_faces))
else:
print("rejected mesh because non manifold edges={}:".format(non_manifold_edges))
return False
def make_cube(file, output):
for _ in range(5):
cube = vtk.vtkCubeSource()
cube.SetXLength(3)
cube.SetYLength(3)
cube.SetZLength(3)
cube.SetCenter(0, -1.4, 0)
cube.Update()
input1 = cube.GetOutput()
cube_tri = vtk.vtkTriangleFilter()
cube_tri.SetInputData(input1)
bat = load_file(file)
theta = np.random.uniform(0, 360)
translate_x = np.random.uniform(-0.9, 0.9)
translate_y = np.random.uniform(-0.9, 0.9)
trans = vtk.vtkTransform()
trans.Translate(translate_x, 0, translate_y)
rot = vtk.vtkTransform()
rot.RotateY(theta)
rot.Concatenate(trans)
transformer = vtk.vtkTransformPolyDataFilter()
transformer.SetInputData(bat)
transformer.SetTransform(rot)
transformer.Update()
bat_tri = vtk.vtkTriangleFilter()
bat_tri.SetInputData(transformer.GetOutput())
booleanOperation = vtk.vtkBooleanOperationPolyDataFilter()
booleanOperation.SetOperationToDifference()
# booleanOperation.SetOperationToUnion()
# booleanOperation.SetOperationToIntersection()
booleanOperation.SetInputConnection(0, cube_tri.GetOutputPort())
booleanOperation.SetInputConnection(1, bat_tri.GetOutputPort())
booleanOperation.Update()
theta = np.random.uniform(0, 360, size=3)
rot_x = vtk.vtkTransform()
rot_x.RotateX(theta[0])
rot_y = vtk.vtkTransform()
rot_y.RotateY(theta[1])
rot_z = vtk.vtkTransform()
rot_z.RotateZ(theta[2])
rot_x.Concatenate(rot_y)
rot_x.Concatenate(rot_z)
transformer.SetInputData(booleanOperation.GetOutput())
transformer.SetTransform(rot_x)
transformer.Update()
num_of_faces = transformer.GetOutput().GetNumberOfPolys()
featureEdges = vtk.vtkFeatureEdges()
featureEdges.FeatureEdgesOff()
featureEdges.BoundaryEdgesOff()
featureEdges.NonManifoldEdgesOn()
featureEdges.SetInputData(transformer.GetOutput())
featureEdges.Update()
edges = featureEdges.GetOutput().GetNumberOfCells()
if 100 < num_of_faces < 650 and edges == 0:
export_decimated_poly(transformer.GetOutput(), output)
return True
print("skipping {}".format(file))
return False
def cube_folder(input_extrudes, output_folder, cubes_per_extrude, classes_per_cube, dataset_size):
files = []
for file in input_extrudes.glob("*.obj"):
files.append(file)
all_classes = np.unique(sorted([x.name.split('-')[0] for x in files]))
if classes_per_cube == 1:
for file in files:
class_name = file.name.split('-')[0]
class_dir = Path(output_folder, class_name)
class_dir.mkdir(parents=True, exist_ok=True)
for i in range(cubes_per_extrude):
dst = Path(class_dir, "{}_{:04d}.obj".format(file.stem, i))
if not make_cube(file, dst):
break
elif classes_per_cube == 2:
gt_file = Path(output_folder, "labels.csv")
cur_size = 0
gt_dict = {}
while cur_size < dataset_size:
selected_files = np.random.choice(np.array(files), size=2, replace=False)
dst = Path(output_folder, "{:06d}.obj".format(cur_size))
if not dst.is_file():
print(selected_files[0].name, selected_files[1].name)
if make_cube_two_sided(selected_files, dst):
cur_size += 1
print(cur_size)
selected_classes = np.array([x.stem.split("-")[0] for x in selected_files])
label = np.isin(all_classes, selected_classes)
gt_dict[dst] = label
with open(gt_file, "a+") as f:
val = np.array2string(label.astype(int), max_line_width=1000, separator=",")
f.write("{},{}\n".format(dst, val))
else:
cur_size += 1
print(cur_size)
def scale_contour(contour):
max_val = np.max(contour)
min_val = np.min(contour)
contour = (contour - min_val) / (max_val - min_val)
contour[:,:, 0] -= (np.max(contour[:, :, 0]) + np.min(contour[:, :, 0])) / 2
contour[:,:, 1] -= (np.max(contour[:, :, 1]) + np.min(contour[:, :, 1])) / 2
return contour
def export_obj(vertices, faces, export_path, name):
with open('%s/%s.obj' % (export_path, name.lower()), 'w+') as f:
for vertex in vertices:
f.write("v %f %f %f\n" % (vertex[0], vertex[1], vertex[2]))
for face_id in range(len(faces) - 1):
f.write("f %d %d %d\n" % (faces[face_id][0] + 1, faces[face_id][1] + 1, faces[face_id][2] + 1))
f.write("f %d %d %d" % (faces[-1][0] + 1, faces[-1][1] + 1, faces[-1][2] + 1))
def extrude_segments(segments, height=.5):
"""
extrudes a triangulation "segments" in the y direction by height
:param segments: the triangulation (vertices and triangles)
:param height: the height to extrude with
:return: the new triangulation (Vertices and triangles)
"""
faces_bottom = segments["triangles"]
vertices = segments["vertices"]
vertices_count = len(vertices)
faces_top = faces_bottom.copy()
faces_top += len(vertices)
faces_top = np.flip(faces_top, 1)
vertices_bottom = np.zeros([vertices_count,3])
vertices_bottom [:, 0] = vertices[:, 0]
vertices_bottom [:, 2] = vertices[:, 1]
vertices_top = vertices_bottom.copy()
vertices_top[:, 1] = height
vertices = np.concatenate((vertices_bottom, vertices_top), 0)
side_faces = np.zeros([vertices_count * 2, 3], dtype=np.int32)
for i in range(vertices_count):
side_faces[i*2, :] = [i, (i + 1) % vertices_count, (i + 1) % vertices_count + vertices_count]
side_faces[i*2 + 1, :] = [i, (i + 1) % vertices_count + vertices_count, i + vertices_count]
faces = np.concatenate((faces_bottom, faces_top, side_faces), 0)
return vertices, faces
def read_image(file):
image = np.array(Image.open(file), dtype=np.uint8)
image = np.expand_dims(image, 2)
return np.repeat(image, 3, axis=2)
def image_to_mesh(input_image, output_path, file_name):
if Path(output_path, file_name + ".obj").is_file():
return
img = read_image(input_image)
if img is None:
print("Image {} not found".format(input_image))
sys.exit(1)
img = cv.cvtColor(img,cv.COLOR_BGR2GRAY)
thresh = np.zeros(img.shape[:2], dtype=np.uint8)
thresh[img > 0.8] = 1
# ret, thresh = cv.threshold(img, 127, 255, 0)
contours, _ = cv.findContours(thresh, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_TC89_L1)
if len(contours) == 0:
print(input_image)
print('error')
return
contour = contours[0]
if len(contours) > 1:
for c in contours:
if c.shape[0] > contour.shape[0]:
contour = c
epsilon = 0.001 * cv.arcLength(contour, True)
contour = cv.approxPolyDP(contour, epsilon, True)
v = {"vertices": np.array([]), "segments": np.array([])}
overhead = 0
contour = scale_contour(contour)
contour = list(map(lambda x: [x[0][0], x[0][1]], contour))
contour_segments = []
for s in range(len(contour)):
contour_segments.append([s + overhead, ((s+1) % (len(contour))) + overhead])
overhead += len(contour)
v["vertices"] = np.array(contour)
v["segments"] = np.array(contour_segments)
segments = triangle.triangulate(v, 'p')
vertices, faces = extrude_segments(segments)
export_obj(vertices, faces, output_path, file_name)
# print("done")
def convert_image(input_image, output_path, file_name):
im = Image.open(input_image)
background = Image.new("RGB", im.size, (255, 255, 255))
background.paste(im)
background.save("%s/%s.jpg" % (output_path, file_name), 'JPEG')
def imgs_to_meshes(input_path, export_path):
# classes = ['apple', 'bat', 'bell', 'bone', 'brick', 'camel', 'car', 'chopper', 'elephant', 'fork',
# 'guitar', 'hammer', 'heart', 'horseshoe', 'key', 'lmfish', 'octopus', 'shoe', 'spoon', 'tree',
# 'turtle', 'watch']
# classes = ['apple']
for file in input_path.glob("*.gif"):
image_to_mesh(file, export_path, file.stem)
# if file.stem.split("-")[0].lower() in classes:
# image_to_mesh(file, export_path, file.stem)
def jpg_folder(input_path, export_path):
for root, _, files in os.walk(input_path):
for file in files:
file_name, file_extension = os.path.splitext(file)
if file_extension == '.gif':
convert_image(os.path.join(root, file), export_path, file_name)
def parse_arguments():
parser = argparse.ArgumentParser(description='double-cube-engravings')
parser.add_argument('MPEG7', type=str, help='Path to MPEG7 dataset containg the .gif files')
parser.add_argument('extrudes', type=str, help='Path to create extruded obj files in.')
parser.add_argument('cubes', type=str, help='Path to create final output in')
parser.add_argument('nclass_pcube', type=int, default=2, choices=[1, 2], help='number of engravings per cube')
parser.add_argument('dataset_size', type=int, default=1e5, help='size of dataset (used only if nclass_pcube=2)')
parser.add_argument('ncubes_pextrude', type=int, default=10, help='number of extrudes per cube (only used if nclass_pcube=1)')
args = parser.parse_args()
extrudes.mkdir(exist_ok=True, parents=True)
cubes_path.mkdir(exist_ok=True, parents=True)
args.MPEG7 = Path(MPEG7)
args.extrudes = Path(extrudes)
args.cubes = Path(cubes)
return args
if __name__ == "__main__":
"""
creates double cubes engravings from MPEG7 shape dataset
download MPEG7 from here : https://dabi.temple.edu/external/shape/MPEG7/dataset.html
"""
args = parse_arguments()
imgs_to_meshes(args.MPEG7, args.extrudes)
cube_folder(args.extrudes, args.cubes,
cubes_per_extrude=args.ncubes_pextrude,
classes_per_cube=args.nclass_pcube,
args.dataset_size)