houdini art stuff

 Normalize node in a vop If you were to, for example, move some points along their normals by a fixed amount, but the normals were not all of the same length, some points would move more than others. The normalize node (or function in vex), will return a vector in the same direction as the input but with a length of one.

 VDB Analysis This node computes some property from the values of VDB volumes, and generates new VDB volumes where the voxel values are the computed results. Using the  Output name  parameter you can choose whether the results volumes replace the original volumes. https://www.sidefx.com/docs/houdini/nodes/sop/vdbanalysis.html

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. S ome volumetric displays use  voxels  to describe their resolution] Voxels can contain Scalar or vector values