Open3D Flashcards
What is a Voxel Block Grid in Open3D?
A Voxel Block Grid is a sparse voxel-based data structure used in Open3D for efficient spatial partitioning and storage of 3D data, enabling fast queries and updates.
What is the purpose of a Truncated Signed Distance Function (TSDF) in 3D reconstruction?
TSDF represents the distance of each point to the nearest surface, storing positive values for points outside and negative values for points inside the object.
How does TSDF help in 3D reconstruction?
TSDF enables smooth surface representation by averaging distance values from multiple depth frames, reducing noise and improving accuracy in volumetric reconstruction.
What is the role of a point cloud in Open3D?
A point cloud is a collection of 3D points representing object surfaces, used for processing, visualization, and reconstruction tasks.
Which Open3D function is commonly used to downsample a point cloud?
The voxel_down_sample() function reduces the number of points by grouping them into voxel-sized clusters, improving efficiency.
What is the purpose of normal estimation in point cloud processing?
Normal estimation provides surface orientation information, essential for tasks like registration, meshing, and rendering.
How does Open3D generate a mesh from a point cloud?
Open3D uses algorithms like Poisson reconstruction or Ball-Pivoting to create a continuous surface from point clouds.
What is Poisson surface reconstruction in Open3D?
Poisson surface reconstruction is an algorithm that estimates a smooth surface from a point cloud by solving a mathematical function based on normal vectors.
What is the difference between point cloud processing and mesh processing?
Point cloud processing deals with unstructured sets of 3D points, while mesh processing works with structured surfaces made of vertices, edges, and faces.
What is mesh decimation, and why is it used?
Mesh decimation reduces the number of polygons in a mesh while preserving its shape, improving performance in rendering and processing.
