Volumes

SDF - Signed Distance Field 

Signed definition in maths, is a number that could have positive or negative value.


So in a signed distance field, each voxel contains scalar values of the distance towards the surface.


[voxel -In 3D computer graphics, a voxel represents a value on a regular grid in three-dimensional space. Some volumetric displays use voxels to describe their resolution]
Voxels can contain Scalar or vector values











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