3D Representations: Difference between revisions
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===Light Field=== | ===Light Field=== | ||
{{main | Light field}} | |||
This is similar to a collection of images.<br> | This is similar to a collection of images.<br> | ||
However, instead of thinking of it as a set of images, each pixel represents the color along a ray in 3D space.<br> | However, instead of thinking of it as a set of images, each pixel represents the color along a ray in 3D space.<br> | ||
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3-dimensions for the starting point of the ray and 2 dimensions for the direction of the ray.<br> | 3-dimensions for the starting point of the ray and 2 dimensions for the direction of the ray.<br> | ||
Typically we assume the rays lie in an empty/transparent space until they hit a surface thus rays can be models as lines which can be defined with 4 dimensions.<br> | Typically we assume the rays lie in an empty/transparent space until they hit a surface thus rays can be models as lines which can be defined with 4 dimensions.<br> | ||
===Volume=== | ===Volume=== | ||
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===Marching cubes=== | ===Marching cubes=== | ||
Marching cubes converts volumes to meshes. | Marching cubes converts volumes or signed distance fields to meshes. | ||
===Reconstruction=== | ===Reconstruction=== | ||
Structure from motion and multi view stereo methods can build point clouds from 2D images.<br> | Structure from motion and multi view stereo methods can build point clouds from 2D images.<br> | ||
Meshing, or | Meshing, or [[Surface Reconstruction]], works on converting this point clouds into meshes. | ||
==See Also== | ==See Also== | ||
* [[Image-based rendering]] | * [[Image-based rendering]] | ||