Exporting COLMAP to CMP-MVS

[Oleksii Martens]

Hi Johannes,

I am working on the reconstruction of the specific objects of complex geometric form. I used to use VisualSFM - CMP-MVS pipeline. 

Recently, I was looking to improve the quality of my models with global SFM. And I found your "Structure-from-Motion Revisited" paper. 
I just have tested the COLMAP on my dataset. The resulting sparse model is really impressive. Now I am trying to export it to the CMP-MVS input format. 

I followed the tutorial https://colmap.github.io/tutorial#dense-reconstruction:
Extras>Undistortion>CMP-MVS

COLMAP output is not producing the ".ini" file while exporting. I'm a bit confused with using the COLMAP output as CMP-MVS input because CMP-MVS expects the ".ini" input.  
Can you advice how to use the COLMAP output as CMP-MVS input, please

[Johannes Schönberger]

Seems like the CMP-MVS support is broken at the moment. I created a ticket on Github and hope to fix it soon. I'll try to remember updating this thread here then.

[Oleksii Martens]

Colmap & CMP-MVS & PMVS

1. I have managed to run CMP-MVS on Colmap output. As I remember, I just created the mvs.ini file with my parameters. 
Conclusion 1: After running the CMP-MVS on Colmap output, I've realized that it is not worthy. CMP-MVS output was the same as I could get after running CMP-MVS on VisualSFM output (which would work faster).

2. I tried to use the same Colmap output for running pmvs-2. Initially, this idea did not work out because pmvs-2 requires different data structure than Colmap produces. So, I changed the Colmap output according to pmvs-2 documentation (http://www.di.ens.fr/pmvs/documentation.html). 
Conclusion 2: Running pmvs-2 did not produce a high-quality dense model as I expected to have out of the high-density point cloud 

For CMP-MVS:

mvs.ini

[global]

dirName="D:\path\data\"

prefix=""

imgExt="jpg"

ncams=139

width=1884

height=1059

scale=1

workDirName="_tmp"

doPrepareData=TRUE

doPrematchSifts=TRUE

doPlaneSweepingSGM=TRUE

doFuse=TRUE

nTimesSimplify=10

[uvatlas]

texSide=4096

scale=1

[prematching]

minAngle=3.0

[grow]

minNumOfConsistentCams=6

[filter]

minNumOfConsistentCams=2

[hallucinationsFiltering]

useSkyPrior=FALSE

doLeaveLargestFullSegmentOnly=FALSE

doRemoveHugeTriangles=TRUE

[largeScale]

doGenerateAndReconstructSpaceMaxPts=TRUE

doGenerateSpace=TRUE

planMaxPts=3000000

[generateVideoFrames]

nintermed=20

[DEM]

demW=8000

demH=8000

#EOF

[Oleksii Martens]

MESHING --> 3D MODEL reconstruction suggestions??

I am currently working on meshing a point cloud produced by Colmap. My object of interests looks similar to this photo:

I have an awesome point cloud after running Colmap. But at the same time, the standard Colmap meshing (Poisson surface reconstruction I guess) messes up a point cloud model (the screenshot is attached).

Do you have any suggestion of what tools can I use to produce a decent 3D model based on a dense point cloud?