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img2stl.py
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img2stl.py
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#!/usr/bin/env python3
'''
IMG2STL - Program for conversion of image heightfield to triangle mesh in STL format
-----------------------------------------------------------------------------------------
Created by: Ilya Razmanov (mailto:ilyarazmanov@gmail.com)
aka Ilyich the Toad (mailto:amphisoft@gmail.com)
History:
1.0.0.0 Initial production release.
1.0.1.0 Program converted into self-calling function to have a possibility to import it.
1.9.1.0 Multiple changes everywhere lead to whole product update. Versioning changed to MAINVERSION.MONTH since Jan 2024.DAY.subversion
1.10.1.0 Maintenance update.
-------------------
Main site:
https://dnyarri.github.io
Project mirrored at:
https://github.com/Dnyarri/img2mesh
https://gitflic.ru/project/dnyarri/img2mesh
'''
__author__ = "Ilya Razmanov"
__copyright__ = "(c) 2024 Ilya Razmanov"
__credits__ = "Ilya Razmanov"
__license__ = "unlicense"
__version__ = "1.9.1.0"
__maintainer__ = "Ilya Razmanov"
__email__ = "ilyarazmanov@gmail.com"
__status__ = "Production"
from tkinter import Tk, Label, filedialog
from pathlib import Path
from png import Reader # I/O with PyPNG from: https://gitlab.com/drj11/pypng
# ACHTUNG! Starting a whole-program procedure!
def img2stl():
'''
Procedure for opening PNG heightfield and creating stereolithography .stl 3D mesh file from it.
'''
# --------------------------------------------------------------
# Creating dialog
iconpath = Path(__file__).resolve().parent / 'vaba.ico'
iconname = str(iconpath)
useicon = iconpath.exists() # Check if icon file really exist. If False, it will not be used later.
sortir = Tk()
sortir.title('PNG to STL conversion')
if useicon:
sortir.iconbitmap(iconname) # Replacement for simple sortir.iconbitmap('name.ico') - ugly but stable.
sortir.geometry('+200+100')
zanyato = Label(sortir, text='Allons-y!', font=('Courier', 14), padx=16, pady=10, justify='center')
zanyato.pack()
sortir.withdraw()
# Main dialog created and hidden
# --------------------------------------------------------------
# Open source image
sourcefilename = filedialog.askopenfilename(title='Open source PNG file', filetypes=[('PNG', '.png')], defaultextension=('PNG', '.png'))
# Source file name taken
if (sourcefilename == '') or (sourcefilename is None):
sortir.destroy()
return None
# break if user press 'Cancel'
source = Reader(filename=sourcefilename)
# opening file with PyPNG
X, Y, pixels, info = source.asDirect()
# Opening image, iDAT comes to "pixels" generator, to be tuple'd later
Z = info['planes'] # Maximum channel number
imagedata = tuple((pixels)) # Building tuple from generator
if info['bitdepth'] == 8:
maxcolors = 255 # Maximal value for 8-bit channel
if info['bitdepth'] == 16:
maxcolors = 65535 # Maximal value for 16-bit channel
# source file opened, initial data received
# opening result file, first get name
resultfilename = filedialog.asksaveasfilename(
title='Save stereolithography STL file',
filetypes=[
('3D print file', '*.stl'),
('All Files', '*.*'),
],
defaultextension=('3D object file', '.stl'),
)
if (resultfilename == '') or (resultfilename is None):
sortir.destroy()
return None
# break if user press 'Cancel'
# return doesn't seem to work well with .asksaveasfile
resultfile = open(resultfilename, 'w')
# result file opened
# Both files opened
# --------------------------------------------------------------
# Functions block:
#
# src a-la FM style src(x,y,z)
# Image should be opened as "imagedata" by main program before
# Note that X, Y, Z are not determined in function, you have to determine it in main program
def src(x, y, z):
'''
Analog of src from FilterMeister, force repeat edge instead of out of range
'''
cx = x
cx = max(0, cx)
cx = min((X - 1), cx)
cy = y
cy = max(0, cy)
cy = min((Y - 1), cy)
position = (cx * Z) + z # Here is the main magic of turning two x, z into one array position
channelvalue = int(((imagedata[cy])[position]))
return channelvalue
# end of src function
def srcY(x, y):
'''
Converting to greyscale, returns Yntensity, force repeat edge instead of out of range
'''
cx = x
cx = max(0, cx)
cx = min((X - 1), cx)
cy = y
cy = max(0, cy)
cy = min((Y - 1), cy)
if info['planes'] < 3: # supposedly L and LA
Yntensity = src(x, y, 0)
else: # supposedly RGB and RGBA
Yntensity = int(0.2989 * src(x, y, 0) + 0.587 * src(x, y, 1) + 0.114 * src(x, y, 2))
return Yntensity
# end of srcY function
#
# end of Functions block
# --------------------------------------------------------------
# Global positioning and scaling to tweak. Offset supposed to make everyone feeling positive, rescale supposed to scale anything to [0..1.0] regardless of what the units are
xOffset = 1.0 # To be added BEFORE rescaling to compensate 0.5 X expansion
yOffset = 1.0 # To be added BEFORE rescaling to compensate 0.5 Y expansion
zOffset = 0.0 # To be added AFTER rescaling just in case there should be something to fix
yRescale = xRescale = 1.0 / float(max(X, Y)) # To fit object into 1,1,1 cube
zRescale = 1.0 / float(maxcolors)
# WRITING STL FILE, finally
resultfile.write('solid pryanik_nepechatnyj\n') # opening object
# Now going to cycle through image and build mesh
for y in range(0, Y, 1):
message = f'Processing row {str(y)} of {str(Y)}...'
sortir.deiconify()
zanyato.config(text=message)
sortir.update()
sortir.update_idletasks()
for x in range(0, X, 1):
# Since I was unable to find clear declaration of coordinate system, I'll plug a coordinate switch here
# Reading switch:
xRead = x
yRead = Y - 1 - y
# 'yRead = Y - y' coordinate mirror to mimic Photoshop coordinate system; +/- 1 steps below are inverted correspondingly vs. original img2mesh
# Remains of Writing switch. No longer used since v. 0.1.0.2 but var names remained so dummy plug must be here.
xWrite = x
yWrite = y
v9 = srcY(xRead, yRead) # Current pixel to process and write. Then going to neighbours
v1 = 0.25 * (v9 + srcY((xRead - 1), yRead) + srcY((xRead - 1), (yRead + 1)) + srcY(xRead, (yRead + 1)))
v3 = 0.25 * (v9 + srcY(xRead, (yRead + 1)) + srcY((xRead + 1), (yRead + 1)) + srcY((xRead + 1), yRead))
v5 = 0.25 * (v9 + srcY((xRead + 1), yRead) + srcY((xRead + 1), (yRead - 1)) + srcY(xRead, (yRead - 1)))
v7 = 0.25 * (v9 + srcY(xRead, (yRead - 1)) + srcY((xRead - 1), (yRead - 1)) + srcY((xRead - 1), yRead))
# finally going to pyramid building
# top part begins
resultfile.writelines(
[
' facet normal 0 0 1\n', # triangle 2 normal up
' outer loop\n', # 1 - 9 - 3
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v1):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+zRescale*v9):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v3):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 1\n', # triangle 4 normal up
' outer loop\n', # 3 - 9 - 5
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v3):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+zRescale*v9):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v5):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 1\n', # triangle 6 normal up
' outer loop\n', # 5 - 9 - 7
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v5):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+zRescale*v9):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v7):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 1\n', # triangle 8 normal up
' outer loop\n', # 7 - 9 - 1
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v7):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+zRescale*v9):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v1):e}\n',
' endloop\n',
' endfacet\n',
]
)
# top part ends
# left side begins
if x == 0:
resultfile.writelines(
[
' facet normal -1 0 0\n', # triangle 8- normal left
' outer loop\n', # 1 - down1 - 7
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v1):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v7):e}\n',
' endloop\n',
' endfacet\n',
' facet normal -1 0 0\n', # triangle 8- normal left
' outer loop\n', # down1 - down7 - 7
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v7):e}\n',
' endloop\n',
' endfacet\n',
]
)
# left side ends
# right side begins
if x == (X - 1):
resultfile.writelines(
[
' facet normal 1 0 0\n', # triangle 4+ normal left
' outer loop\n', # 5 - down5 - 3
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v5):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v3):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 1 0 0\n', # triangle 4+ normal left
' outer loop\n', # 3 - down5 - down3
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v3):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
' endloop\n',
' endfacet\n',
]
)
# right side ends
# far side begins
if y == 0:
resultfile.writelines(
[
' facet normal 0 -1 0\n', # triangle 2- normal far
' outer loop\n', # 3 - down - 1
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v3):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v1):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 -1 0\n', # triangle 2- normal far
' outer loop\n', # down - down - 1
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+zRescale*v1):e}\n',
' endloop\n',
' endfacet\n',
]
)
# far side ends
# close side begins
if y == (Y - 1):
resultfile.writelines(
[
' facet normal 0 1 0\n', # triangle 6+ normal close
' outer loop\n', # 7 - down - 5
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v7):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v5):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 1 0\n', # triangle 6+ normal close
' outer loop\n', # down - down - 5
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+zRescale*v5):e}\n',
' endloop\n',
' endfacet\n',
]
)
# close side ends
# bottom part begins
resultfile.writelines(
[
' facet normal 0 0 -1\n', # triangle 2 normal up
' outer loop\n', # 1 - 9 - 3
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 -1\n', # triangle 4 normal up
' outer loop\n', # 3 - 9 - 5
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 -1\n', # triangle 6 normal up
' outer loop\n', # 5 - 9 - 7
f' vertex {(xRescale*(xWrite+0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
' endloop\n',
' endfacet\n',
' facet normal 0 0 -1\n', # triangle 8 normal up
' outer loop\n', # 7 - 9 - 1
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite+0.5+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite+xOffset)):e} {(yRescale*(yWrite+yOffset)):e} {(zOffset+0.0):e}\n',
f' vertex {(xRescale*(xWrite-0.5+xOffset)):e} {(yRescale*(yWrite-0.5+yOffset)):e} {(zOffset+0.0):e}\n',
' endloop\n',
' endfacet\n',
]
)
# bottom part ends
resultfile.write('endsolid pryanik_nepechatnyj') # closing object
# Close output
resultfile.close()
# --------------------------------------------------------------
# Destroying dialog
sortir.destroy()
sortir.mainloop()
# Dialog destroyed and closed
# --------------------------------------------------------------
# Procedure ended, the program begins
if __name__ == "__main__":
img2stl()