Function parseImagesText

src/parsers/images.ts:105–187

(text: string)

 * 2362.39 248.498 58396 1784.7 268.254 59027 1784.7 268.254 -1
 */
export function parseImagesText(text: string): Map<number, Image> {
  const images = new Map<number, Image>();
  const lines = text.split('\n');

  let i = 0;
  while (i < lines.length) {
    const line = lines[i].trim();

    // Skip comments and empty lines
    if (line.startsWith('#') || line === '') {
      i++;
      continue;
    }

    // Parse image header line
    const headerParts = line.split(/\s+/);
    if (headerParts.length < 10) {
      i++;
      continue;
    }

    const imageId = parseColmapIntegerToken(headerParts[0], { min: 0 });
    const qvecValues = parseColmapNumberTokens(headerParts.slice(1, 5));
    const tvecValues = parseColmapNumberTokens(headerParts.slice(5, 8));
    const cameraId = parseColmapIntegerToken(headerParts[8], { min: 0 });
    const name = headerParts[9];

    if (imageId === null || qvecValues === null || tvecValues === null || cameraId === null) {
      i++;
      continue;
    }

    const qvec: [number, number, number, number] = [
      qvecValues[0],
      qvecValues[1],
      qvecValues[2],
      qvecValues[3],
    ];
    const tvec: [number, number, number] = [
      tvecValues[0],
      tvecValues[1],
      tvecValues[2],
    ];

    // Parse points2D line (next line)
    i++;
    const points2D: Point2D[] = [];

    if (i < lines.length && !lines[i].startsWith('#')) {
      const pointsLine = lines[i].trim();
      if (pointsLine !== '') {
        const pointsParts = pointsLine.split(/\s+/);

        // Points are in triplets: X, Y, POINT3D_ID
        for (let j = 0; j + 2 < pointsParts.length; j += 3) {
          const x = parseColmapNumberToken(pointsParts[j]);
          const y = parseColmapNumberToken(pointsParts[j + 1]);
          const point3DId = parseColmapBigIntToken(pointsParts[j + 2]);