Light field: Difference between revisions
Created page with "Small survey over light fields ==Introduction== {{main | Wikipedia: Light field}} A light field describes all light in a scene. Given a position <math>(x,y,z)</math> and an..." |
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==Resources== | ==Resources== | ||
* [https://graphics.stanford.edu/papers/light/light-lores-corrected.pdf Light Field Rendering by Marc Levoy and Pat Hanrahan] | * [https://graphics.stanford.edu/papers/light/light-lores-corrected.pdf Light Field Rendering by Marc Levoy and Pat Hanrahan (SIGGRAPH '96)] | ||
Revision as of 16:14, 17 December 2020
Small survey over light fields
Introduction
A light field describes all light in a scene.
Given a position \(\displaystyle (x,y,z)\) and angle \(\displaystyle (\theta, \phi)\) describing a ray, the 5D function \(\displaystyle L(x,y,z,\theta,\phi)\) is the radiance at that point.
For reasonable scenes, the radiance is consistent along the ray so light fields are actually 4D functions.
Representations
Lightfields can be represented as a set of images along a 2D grid. Each image is captured from a slightly different viewpoint but faces the same object using a sheer projection or rotation.
The easiest way to collect light field data is to simulate it from within a virtual environment using software.