Source code for py3dtiles.reader.xyz_reader

import csv
import math
from pathlib import Path
from typing import Generator, List, Optional, Tuple

import numpy as np
import numpy.typing as npt
from pyproj import Transformer

from py3dtiles.typing import MetadataReaderType, OffsetScaleType, PortionItemType


[docs] def get_metadata(path: Path, fraction: int = 100) -> MetadataReaderType: aabb = None count = 0 seek_values = [] with path.open() as f: file_sample = f.read( 2048 ) # For performance reasons we just snif the first part dialect = csv.Sniffer().sniff(file_sample) f.seek(0) if csv.Sniffer().has_header(file_sample): f.readline() while True: batch = 10_000 points = np.zeros((batch, 3)) offset = f.tell() for i in range(batch): line = f.readline() if not line: points = np.resize(points, (i, 3)) break points[i] = [float(s) for s in line.split(dialect.delimiter)][:3] if points.shape[0] == 0: break if not count % 1_000_000: seek_values += [offset] count += points.shape[0] batch_aabb = np.array([np.min(points, axis=0), np.max(points, axis=0)]) # Update aabb if aabb is None: aabb = batch_aabb else: aabb[0] = np.minimum(aabb[0], batch_aabb[0]) aabb[1] = np.maximum(aabb[1], batch_aabb[1]) # We need an exact point count point_count = count * fraction // 100 _1M = min(count, 1_000_000) steps = math.ceil(count / _1M) if steps != len(seek_values): raise ValueError( "the size of seek_values should be equal to steps," f"currently steps = {steps} and len(seek_values) = {len(seek_values)}" ) portions: List[PortionItemType] = [ (i * _1M, min(count, (i + 1) * _1M), seek_values[i]) for i in range(steps) ] pointcloud_file_portions = [(str(path), p) for p in portions] if aabb is None: raise ValueError(f"There is no point in the file {path}") return { "portions": pointcloud_file_portions, "aabb": aabb, "crs_in": None, "point_count": point_count, "avg_min": aabb[0], }
[docs] def run( filename: str, offset_scale: OffsetScaleType, portion: PortionItemType, transformer: Optional[Transformer], color_scale: Optional[float], ) -> Generator[ Tuple[npt.NDArray[np.float32], npt.NDArray[np.uint8], npt.NDArray[np.uint8]], None, None, ]: """ Reads points from a .xyz or .csv file Consider XYZIRGB format following FME documentation(*). We do the following hypothesis and enhancements: - A header line defining columns in CSV style may be present, but will be ignored. - The separator separating the columns is automagically guessed by the reader. This is generally fail safe. It will not harm to use commonly accepted separators like space, tab, colon, semi-colon. - The order of columns is fixed. The reader does the following assumptions: - 3 columns mean XYZ - 4 columns mean XYZI - 6 columns mean XYZRGB - 7 columns mean XYZIRGB - 8 columns mean XYZIRGB followed by classification data. Classification data must be integers only. - all columns after the 8th column will be ignored. NOTE: we assume RGB are 8 bits components. (*) See: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_ReadersWriters/pointcloudxyz/pointcloudxyz.htm """ with open(filename) as f: dialect = csv.Sniffer().sniff(f.read(2048)) f.seek(0) f.readline() # skip first line in case there is a header we promised to ignore feature_nb = len(f.readline().split(dialect.delimiter)) if feature_nb < 8: feature_nb = 7 # we pad to 7 columns with 0 if feature_nb > 8: feature_nb = 8 # We ignore other data as downstream only 1 value for classification data is supported. # Once downstream supports multiple classification values this reader will as well # when this line is removed. point_count = portion[1] - portion[0] step = min(point_count, max((point_count) // 10, 100000)) f.seek(portion[2]) for _ in range(0, point_count, step): points = np.zeros((step, feature_nb), dtype=np.float32) for j in range(step): line = f.readline() if not line: points = np.resize(points, (j, feature_nb)) break line_features: List[Optional[float]] = [ float(s) for s in line.split(dialect.delimiter)[:feature_nb] ] if len(line_features) == 3: line_features += [None] * 4 # Insert intensity and RGB elif len(line_features) == 4: line_features += [None] * 3 # Insert RGB elif len(line_features) == 6: line_features.insert(3, None) # Insert intensity points[j] = line_features x, y, z = (points[:, c] for c in [0, 1, 2]) if transformer: x, y, z = transformer.transform(x, y, z) x = (x + offset_scale[0][0]) * offset_scale[1][0] y = (y + offset_scale[0][1]) * offset_scale[1][1] z = (z + offset_scale[0][2]) * offset_scale[1][2] coords = np.vstack((x, y, z)).transpose() if offset_scale[2] is not None: # Apply transformation matrix (because the tile's transform will contain # the inverse of this matrix) coords = np.dot(coords, offset_scale[2]) coords = np.ascontiguousarray(coords.astype(np.float32)) # Read colors: 3 last columns when excluding classification data if color_scale is None: colors = points[:, 4:7].astype(np.uint8) else: colors = np.clip(points[:, 4:7] * color_scale, 0, 255).astype(np.uint8) if feature_nb > 7: # we have classification data classification = np.array(points[:, 7:], dtype=np.uint8).reshape(-1, 1) else: classification = np.zeros((points.shape[0], 1), dtype=np.uint8) yield coords, colors, classification