# Copyright (c) 2020 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.
import numpy
import math
from PyQt6.QtGui import QImage, qRed, qGreen, qBlue, qAlpha
from PyQt6.QtCore import Qt
from UM.Mesh.MeshReader import MeshReader
from UM.Mesh.MeshBuilder import MeshBuilder
from UM.Math.Vector import Vector
from UM.Job import Job
from UM.Logger import Logger
from .ImageReaderUI import ImageReaderUI
from cura.Scene.CuraSceneNode import CuraSceneNode as SceneNode
class ImageReader(MeshReader):
def __init__(self) -> None:
super().__init__()
self._supported_extensions = [".jpg", ".jpeg", ".bmp", ".gif", ".png"]
self._ui = ImageReaderUI(self)
def preRead(self, file_name, *args, **kwargs):
img = QImage(file_name)
if img.isNull():
Logger.log("e", "Image is corrupt.")
return MeshReader.PreReadResult.failed
width = img.width()
depth = img.height()
largest = max(width, depth)
width = width / largest * self._ui.default_width
depth = depth / largest * self._ui.default_depth
self._ui.setWidthAndDepth(width, depth)
self._ui.showConfigUI()
self._ui.waitForUIToClose()
if self._ui.getCancelled():
return MeshReader.PreReadResult.cancelled
return MeshReader.PreReadResult.accepted
def _read(self, file_name):
size = max(self._ui.getWidth(), self._ui.getDepth())
return self._generateSceneNode(file_name, size, self._ui.peak_height, self._ui.base_height, self._ui.smoothing, 512, self._ui.lighter_is_higher, self._ui.use_transparency_model, self._ui.transmittance_1mm)
def _generateSceneNode(self, file_name, xz_size, height_from_base, base_height, blur_iterations, max_size, lighter_is_higher, use_transparency_model, transmittance_1mm):
scene_node = SceneNode()
mesh = MeshBuilder()
img = QImage(file_name)
if img.isNull():
Logger.log("e", "Image is corrupt.")
return None
width = max(img.width(), 2)
height = max(img.height(), 2)
aspect = height / width
if img.width() < 2 or img.height() < 2:
img = img.scaled(width, height, Qt.AspectRatioMode.IgnoreAspectRatio)
height_from_base = max(height_from_base, 0)
base_height = max(base_height, 0)
xz_size = max(xz_size, 1)
scale_vector = Vector(xz_size, height_from_base, xz_size)
if width > height:
scale_vector = scale_vector.set(z=scale_vector.z * aspect)
elif height > width:
scale_vector = scale_vector.set(x=scale_vector.x / aspect)
if width > max_size or height > max_size:
scale_factor = max_size / width
if height > width:
scale_factor = max_size / height
width = int(max(round(width * scale_factor), 2))
height = int(max(round(height * scale_factor), 2))
img = img.scaled(width, height, Qt.AspectRatioMode.IgnoreAspectRatio)
width_minus_one = width - 1
height_minus_one = height - 1
Job.yieldThread()
texel_width = 1.0 / width_minus_one * scale_vector.x
texel_height = 1.0 / height_minus_one * scale_vector.z
height_data = numpy.zeros((height, width), dtype = numpy.float32)
for x in range(0, width):
for y in range(0, height):
qrgb = img.pixel(x, y)
if use_transparency_model:
height_data[y, x] = (0.299 * math.pow(qRed(qrgb) / 255.0, 2.2) + 0.587 * math.pow(qGreen(qrgb) / 255.0, 2.2) + 0.114 * math.pow(qBlue(qrgb) / 255.0, 2.2))
else:
height_data[y, x] = (0.212655 * qRed(qrgb) + 0.715158 * qGreen(qrgb) + 0.072187 * qBlue(qrgb)) / 255 # fast computation ignoring gamma and degamma
Job.yieldThread()
if lighter_is_higher == use_transparency_model:
height_data = 1 - height_data
for _ in range(0, blur_iterations):
copy = numpy.pad(height_data, ((1, 1), (1, 1)), mode = "edge")
height_data += copy[1:-1, 2:]
height_data += copy[1:-1, :-2]
height_data += copy[2:, 1:-1]
height_data += copy[:-2, 1:-1]
height_data += copy[2:, 2:]
height_data += copy[:-2, 2:]
height_data += copy[2:, :-2]
height_data += copy[:-2, :-2]
height_data /= 9
Job.yieldThread()
if use_transparency_model:
divisor = 1.0 / math.log(transmittance_1mm / 100.0) # log-base doesn't matter here. Precompute this value for faster computation of each pixel.
min_luminance = (transmittance_1mm / 100.0) ** height_from_base
for (y, x) in numpy.ndindex(height_data.shape):
mapped_luminance = min_luminance + (1.0 - min_luminance) * height_data[y, x]
height_data[y, x] = base_height + divisor * math.log(mapped_luminance) # use same base as a couple lines above this
else:
height_data *= scale_vector.y
height_data += base_height
if img.hasAlphaChannel():
for x in range(0, width):
for y in range(0, height):
height_data[y, x] *= qAlpha(img.pixel(x, y)) / 255.0
heightmap_face_count = 2 * height_minus_one * width_minus_one
total_face_count = heightmap_face_count + (width_minus_one * 2) * (height_minus_one * 2) + 2
mesh.reserveFaceCount(total_face_count)
# initialize to texel space vertex offsets.
# 6 is for 6 vertices for each texel quad.
heightmap_vertices = numpy.zeros((width_minus_one * height_minus_one, 6, 3), dtype = numpy.float32)
heightmap_vertices = heightmap_vertices + numpy.array([[
[0, base_height, 0],
[0, base_height, texel_height],
[texel_width, base_height, texel_height],
[texel_width, base_height, texel_height],
[texel_width, base_height, 0],
[0, base_height, 0]
]], dtype = numpy.float32)
offsetsz, offsetsx = numpy.mgrid[0: height_minus_one, 0: width - 1]
offsetsx = numpy.array(offsetsx, numpy.float32).reshape(-1, 1) * texel_width
offsetsz = numpy.array(offsetsz, numpy.float32).reshape(-1, 1) * texel_height
# offsets for each texel quad
heightmap_vertex_offsets = numpy.concatenate([offsetsx, numpy.zeros((offsetsx.shape[0], offsetsx.shape[1]), dtype = numpy.float32), offsetsz], 1)
heightmap_vertices += heightmap_vertex_offsets.repeat(6, 0).reshape(-1, 6, 3)
# apply height data to y values
heightmap_vertices[:, 0, 1] = heightmap_vertices[:, 5, 1] = height_data[:-1, :-1].reshape(-1)
heightmap_vertices[:, 1, 1] = height_data[1:, :-1].reshape(-1)
heightmap_vertices[:, 2, 1] = heightmap_vertices[:, 3, 1] = height_data[1:, 1:].reshape(-1)
heightmap_vertices[:, 4, 1] = height_data[:-1, 1:].reshape(-1)
heightmap_indices = numpy.array(numpy.mgrid[0:heightmap_face_count * 3], dtype = numpy.int32).reshape(-1, 3)
mesh._vertices[0:(heightmap_vertices.size // 3), :] = heightmap_vertices.reshape(-1, 3)
mesh._indices[0:(heightmap_indices.size // 3), :] = heightmap_indices
mesh._vertex_count = heightmap_vertices.size // 3
mesh._face_count = heightmap_indices.size // 3
geo_width = width_minus_one * texel_width
geo_height = height_minus_one * texel_height
# bottom
mesh.addFaceByPoints(0, 0, 0, 0, 0, geo_height, geo_width, 0, geo_height)
mesh.addFaceByPoints(geo_width, 0, geo_height, geo_width, 0, 0, 0, 0, 0)
# north and south walls
for n in range(0, width_minus_one):
x = n * texel_width
nx = (n + 1) * texel_width
hn0 = height_data[0, n]
hn1 = height_data[0, n + 1]
hs0 = height_data[height_minus_one, n]
hs1 = height_data[height_minus_one, n + 1]
mesh.addFaceByPoints(x, 0, 0, nx, 0, 0, nx, hn1, 0)
mesh.addFaceByPoints(nx, hn1, 0, x, hn0, 0, x, 0, 0)
mesh.addFaceByPoints(x, 0, geo_height, nx, 0, geo_height, nx, hs1, geo_height)
mesh.addFaceByPoints(nx, hs1, geo_height, x, hs0, geo_height, x, 0, geo_height)
# west and east walls
for n in range(0, height_minus_one):
y = n * texel_height
ny = (n + 1) * texel_height
hw0 = height_data[n, 0]
hw1 = height_data[n + 1, 0]
he0 = height_data[n, width_minus_one]
he1 = height_data[n + 1, width_minus_one]
mesh.addFaceByPoints(0, 0, y, 0, 0, ny, 0, hw1, ny)
mesh.addFaceByPoints(0, hw1, ny, 0, hw0, y, 0, 0, y)
mesh.addFaceByPoints(geo_width, 0, y, geo_width, 0, ny, geo_width, he1, ny)
mesh.addFaceByPoints(geo_width, he1, ny, geo_width, he0, y, geo_width, 0, y)
mesh.calculateNormals(fast = True)
scene_node.setMeshData(mesh.build())
return scene_node