blender-exporter-colmap

blender-exporter-colmap

Blender plugin which generates a dataset for colmap by exporting blender camera poses and rendering scene.

How to use

You can generate a dataset for colmap in below steps.

1. Place cameras on the scene

You can place cameras on the scene as you like.

2. Export your scene as dataset

From menu, execute this extension. ([File] -> [Export] -> [Colmap dataset])

3. You can get dataset for SfM

You can get cameras on scene exported as dataset on specified path.

There are also images rendered with parameters and from the view point of camera in images folder.

output format

This script generate these files on a selected folder.

Name	Description
📂images	Contains rendered images. Each image is rendered with parameters (intrinsic and pose) of camera in the scene.
📄cameras.txt	Contains intrinsic paramters of each camera.
📄images.txt	Contains camera poses of each camera.
📄points3D.txt	Empty file

For details, please refer to COLMAP documentation.

How to use in colmap

You can use COLMAP cli for executing SfM with generated dataset.

colmap feature_extractor --database_path "/path/to/output/database.db" --image_path "/path/to/dataset/images"

colmap exhaustive_matcher --database_path "/path/to/output/database.db" 

colmap point_triangulator --database_path "/path/to/output/database.db" --image_path "/path/to/dataset/images" --input_path "/path/to/dataset" --output_path "/path/to/output/triangulated/sparse/model"

Then, the result of 3d reconstruction is placed `/path/to/output/triangulated/sparse/model".