Houdini learning

Houdini learning

Increase Volume Density

// In a volumewrangle

@density *= 10;

Substract any VDB by another VDB

// In a volumewrangle

if (volumesample(1,"surface",@P)<0)@density=0;

//inverse:

if (volumesample(1,"surface",@P)>0)@density=0;

Get bound & centroid

// In a null object

bbox(opinputpath('.',0),D_XSIZE)
bbox(opinputpath('.',0),D_YSIZE)
bbox(opinputpath('.',0),D_ZSIZE)

centroid(opinputpath('.',0),D_X)
centroid(opinputpath('.',0),D_Y)
centroid(opinputpath('.',0),D_Z)

UVs

// In this order : uvautoseam - uvflatten - uvlayout
In uvflatten : Seams = seams

Attribwrangle - if...

// Kill emission on a smoke source after frame 300
if (@Frame>300) @density = 0;

Attribfrommap - Use UDIMs images

// Replace 1001 by <UDIM> and check UDIM Filename Expansion

Attribwrangle - Udim number on primitives attributes

// In a wrangle set on Primitives
vector uv = primuv(0, "uv", @primnum, set(0.5, 0.5, 0));
i@udim = 1001 + int(uv.x) + int(uv.y)*10;