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2.8.3.0 Complete coord change for img2pov
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@Dnyarri
Dnyarri committed Jul 12, 2024
1 parent 69e8803 commit 00d8dff
Showing 1 changed file with 40 additions and 44 deletions.
84 changes: 40 additions & 44 deletions img2pov.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
Finally it can be adjusted nondestructively within POVRay
instead of re-editing in Photoshop or GIMP and re-exporting every time.
2.8.2.5 Arbitrary decision to replace all maps with one arbitrary spline.
2.8.3.0 Everything rewritten to fully match Photoshop coordinate system.
Important changes in camera, handle with care!
Main site:
https://dnyarri.github.io
Expand All @@ -35,7 +37,7 @@
__copyright__ = "(c) 2023-2024 Ilya Razmanov"
__credits__ = "Ilya Razmanov"
__license__ = "unlicense"
__version__ = "2.8.2.5"
__version__ = "2.8.3.0"
__maintainer__ = "Ilya Razmanov"
__email__ = "ilyarazmanov@gmail.com"
__status__ = "Production"
Expand Down Expand Up @@ -68,7 +70,7 @@ def img2pov():
if useicon:
sortir.iconbitmap(iconname) # Replacement for simple sortir.iconbitmap('name.ico') - ugly but stable.
sortir.geometry('+200+100')
zanyato = Label(sortir, text='Starting...', font=('Courier', 14), padx=16, pady=10, justify='center')
zanyato = Label(sortir, text='Starting...', font=('Courier', 12), padx=16, pady=10, justify='left')
zanyato.pack()
sortir.withdraw()

Expand Down Expand Up @@ -210,7 +212,7 @@ def srcY(x, y):
'#include "finish.inc"\n',
'#include "metals.inc"\n',
'#include "golds.inc"\n\n',
'\n/* Map function\nMaps are transfer functions z value is passed through.\nResult is similar to Photoshop or GIMP "Curves" applied to source heightfield PNG,\nbut here map is nondestructively applied to mesh within POVRay.\nBy default exported map is five points linear spline, corresponding to straight line\ndescribing "identical" transform, i.e. no map adjustment (input=output).\nYou can both edit existing control points and add new ones. Note that points order is irrelevant\nsince POVRay will resort vectors according to entry value (first digits in the row before comma),\nso you can add middle points at the end of the list below or write the whole list upside down. */\n\n',
'\n/* Map function\nMaps are transfer functions z value is passed through.\nResult is similar to Photoshop or GIMP "Curves" applied to source heightfield PNG,\nbut here map is nondestructively applied to mesh within POVRay.\nBy default exported map is five points linear spline, corresponding to straight line\ndescribing "identical" transform, i.e. input = output.\nYou can both edit existing control points and add new ones. Note that points order is irrelevant\nsince POVRay will resort vectors according to entry value (first digits in the row before comma),\nso you can add middle points at the end of the list below or write the whole list upside down. */\n\n',
'#declare Curve = function { // Spline curve construction begins\n',
' spline { linear_spline\n',
' 0.0, <0.0, 0>\n',
Expand All @@ -226,17 +228,21 @@ def srcY(x, y):
proportions = max(X, Y) / X
resultfile.writelines(
[
'\n// Camera and light\n\n',
'#declare camera_position = <0.0, 0.0, 3.0>; // Camera position over object, used for view angle\n\n',
'camera{\n',
'// orthographic\n',
' location camera_position\n',
' right x*image_width/image_height\n',
' up y\n',
' direction <0, 0, 1>\n',
f' angle 2.0*(degrees(atan2({0.5 * proportions}, vlength(camera_position - <0.0, 0.0, 1.0>)))) // Supposed to fit object\n',
' look_at <0.0, 0.0, 0.5>\n}\n\n',
'light_source{0*x\n color rgb <1.0, 1.0, 1.0>\n translate <20, 20, 20>\n}\n',
'\n/* Camera\n\n',
'Coordinate system for the whole scene changed to match Photoshop\n',
'Origin is top left, z points at you */\n\n',
'#declare camera_position = <0.0, 0.0, 3.0>; // Camera position over object, used for angle\n\n',
'camera {\n',
' // orthographic\n',
' location camera_position\n',
' right x*image_width/image_height\n',
' up y\n',
' sky <0, -1, 0>\n',
' direction <0, 0, vlength(camera_position - <0.0, 0.0, 1.0>)> // May alone work for many objects. Otherwise fiddle with angle below\n',
f'// angle 2.0*(degrees(atan2({0.5 * max(X,Y)/X}, vlength(camera_position - <0.0, 0.0, 1.0>)))) // Supposed to fit object\n',
' look_at<0.0, 0.0, 0.5>\n',
'}\n\n',
'light_source {0*x\n color rgb <1.0, 1.0, 1.0>\n translate <-5, -5, 5>\n}\n',
'\n// Layered thething texture\n',
'#declare thething_texture_bottom =\n',
' texture {\n',
Expand Down Expand Up @@ -277,7 +283,6 @@ def srcY(x, y):

xOffset = -0.5 * float(X - 1) # To be added BEFORE rescaling to center object.
yOffset = -0.5 * float(Y - 1) # To be added BEFORE rescaling to center object
zOffset = 0.0

xRescale = 1.0 / float(max(X, Y)) # To fit object into 1,1,1 cube
yRescale = xRescale
Expand All @@ -299,57 +304,48 @@ def srcY(x, y):

for x in range(0, X, 1):

# Reading switch (flipping coordinate system to match Photoshop to POVRay):
xRead = X - 1 - x
yRead = Y - 1 - y
v9 = srcY(x, y) # Current pixel to process and write. Then going to neighbours
v1 = 0.25 * (v9 + srcY(x-1, y-1) + srcY(x, y-1) + srcY(x-1, y))
v3 = 0.25 * (v9 + srcY(x, y-1) + srcY(x+1, y-1) + srcY(x+1, y))
v5 = 0.25 * (v9 + srcY(x+1, y) + srcY(x+1, y+1) + srcY(x, y+1))
v7 = 0.25 * (v9 + srcY(x, y+1) + srcY(x-1, y+1) + srcY(x-1, y))

# Last remains of writing switch. No longer used but var names remained active 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
# finally going to build pyramid

resultfile.write(
f'\n triangle{{<{xRescale*(xWrite-0.5+xOffset)}, {yRescale*(yWrite-0.5+yOffset)}, map({zRescale*v1})> <{xRescale*(xWrite+xOffset)}, {yRescale*(yWrite+yOffset)}, map({zRescale*v9})> <{xRescale*(xWrite+0.5+xOffset)}, {yRescale*(yWrite-0.5+yOffset)}, map({zRescale*v3})>}}'
f'\n triangle {{<{xRescale*(x-0.5+xOffset)}, {yRescale*(y-0.5+yOffset)}, map({zRescale*v1})> <{xRescale*(x+xOffset)}, {yRescale*(y+yOffset)}, map({zRescale*v9})> <{xRescale*(x+0.5+xOffset)}, {yRescale*(y-0.5+yOffset)}, map({zRescale*v3})>}}'
) # Triangle 2 1-9-3

resultfile.write(
f'\n triangle{{<{xRescale*(xWrite+0.5+xOffset)}, {yRescale*(yWrite-0.5+yOffset)}, map({zRescale*v3})> <{xRescale*(xWrite+xOffset)}, {yRescale*(yWrite+yOffset)}, map({zRescale*v9})> <{xRescale*(xWrite+0.5+xOffset)}, {yRescale*(yWrite+0.5+yOffset)}, map({zRescale*v5})>}}'
f'\n triangle {{<{xRescale*(x+0.5+xOffset)}, {yRescale*(y-0.5+yOffset)}, map({zRescale*v3})> <{xRescale*(x+xOffset)}, {yRescale*(y+yOffset)}, map({zRescale*v9})> <{xRescale*(x+0.5+xOffset)}, {yRescale*(y+0.5+yOffset)}, map({zRescale*v5})>}}'
) # Triangle 4 3-9-5

resultfile.write(
f'\n triangle{{<{xRescale*(xWrite+0.5+xOffset)}, {yRescale*(yWrite+0.5+yOffset)}, map({zRescale*v5})> <{xRescale*(xWrite+xOffset)}, {yRescale*(yWrite+yOffset)}, map({zRescale*v9})> <{xRescale*(xWrite-0.5+xOffset)}, {yRescale*(yWrite+0.5+yOffset)}, map({zRescale*v7})>}}'
f'\n triangle {{<{xRescale*(x+0.5+xOffset)}, {yRescale*(y+0.5+yOffset)}, map({zRescale*v5})> <{xRescale*(x+xOffset)}, {yRescale*(y+yOffset)}, map({zRescale*v9})> <{xRescale*(x-0.5+xOffset)}, {yRescale*(y+0.5+yOffset)}, map({zRescale*v7})>}}'
) # Triangle 6 5-9-7

resultfile.write(
f'\n triangle{{<{xRescale*(xWrite-0.5+xOffset)}, {yRescale*(yWrite+0.5+yOffset)}, map({zRescale*v7})> <{xRescale*(xWrite+xOffset)}, {yRescale*(yWrite+yOffset)}, map({zRescale*v9})> <{xRescale*(xWrite-0.5+xOffset)}, {yRescale*(yWrite-0.5+yOffset)}, map({zRescale*v1})>}}'
f'\n triangle {{<{xRescale*(x-0.5+xOffset)}, {yRescale*(y+0.5+yOffset)}, map({zRescale*v7})> <{xRescale*(x+xOffset)}, {yRescale*(y+yOffset)}, map({zRescale*v9})> <{xRescale*(x-0.5+xOffset)}, {yRescale*(y-0.5+yOffset)}, map({zRescale*v1})>}}'
) # Triangle 8 7-9-1

# Pyramid completed. Ave me!

resultfile.write('\n\n inside_vector <0, 0, 1>\n\n')
# Pyramid construction complete. Ave me!

# Sample texture of textures
resultfile.writelines(
[
' texture {thething_texture}\n',
'}\n// Closed thething\n\n',
'#declare boxedthing = object{\n',
' intersection {\n',
'\n\n inside_vector <0, 0, 1>\n\n',
'// clipped_by {plane{-z, -0.01}} // Variant of cropping baseline off\n\n'
' texture {thething_texture}\n\n',
'}\n// Closed thething\n\n', # Main object thething finished
'#declare boxedthing = object {\n',
' intersection {\n',
' box {<-0.5, -0.5, 0>, <0.5, 0.5, 1.0>\n',
' pigment {rgb <0.5, 0.5, 5>}\n',
' pigment {rgb <0.5, 0.5, 5>}\n',
' }\n',
' thething\n',
' }\n',
' }\n',
'}',
'// Constructed CGS "boxedthing" of mesh plus bounding box thus adding side walls and bottom\n\n',
'object{boxedthing}\n\n',
'object {boxedthing}\n\n',
'\n/*\n\nhappy rendering\n\n 0~0\n (---)\n(.>|<.)\n-------\n\n*/',
]
) # Closing solids
Expand Down

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