I’m using a software called Pix4Dmatic and have some questions for their engineers. Could you please help me greet them in a professional manner and ask the following questions on my behalf:
After calibrating with Pix4Dmatic, I exported the current content as an OPF file and got a series of files. I want to modify some of these files to change (add/delete/update) some of the automatic tie points. The following files were exported to the sparse folder:
- classId.glbin
- colors.glbin
- confidence.glbin
- matchCameraIds.glbin
- matchImagePointFeatureIds.glbin
- matchImagePointPixelCoordinates.glbin
- matchImagePointScales.glbin
- matchPointIndexRanges.glbin
- partitioning.glbin
- pcl.gltf
- positions.glbin
- terrainClassId.glbin
We’ve read most of the contents of these files by referring to OPF-glTF point cloud — Open Photogrammetry Format Specification 1.0.5 documentation.
However, we’re not entirely sure about the storage contents of the following three files and have some questions:
- matchImagePointFeatureIds.glbin
We’re not sure how the ‘11788’ ID is obtained. If we want to add a new automatic tie point, how should we assign an ID to it?
11788 0
11210 0
22236 0
- confidence.glbin
We noticed that the values below seem to be a percentage value, but we’re not sure what percentage value it is and how it is calculated.
I want to use this value as a threshold to filter automatic tie points and calculate and
write it according to the same rule when appending or updating.
0.08297962
0.065644264
0.07223773
- partitioning.glbin
The file can be parsed into three parts, childrenIndexing, nodeIndices, and perNodeChunkIndexRanges.
According to the reference document, these values seem to be stored according to octree.
However, as the number of automatic tie points increases, the structure seems to change.
If we want to add or remove some automatic tie points, how should we modify this file?
①childrenIndexing
[1]
[7]
[10]
②nodeIndices
0 0 0 0
1 0 0 1
1 0 1 1
③perNodeChunkIndexRanges
0 262144
262144 280948
543092 280949