UV flatten for downwards tapered cylinder/tube/cone in Houdini

UV flatten for downwards tapered cylinder/tube/cone

easiest way:

add uv laps unwrap cylinder node

or

(select top and bottom vertices to properly align UVs) add tube radius: 0.27 0.5 add group node group name: topgroup group type: vertices uncheck base group check keep in bounding regions size: bbox(0, DXSIZE) 0.001 bbox(0, DZSIZE) center: 0 bbox(0, D_YMAX) 0 (or just select all top vertices manually) add group node group name: bottomgroup group type: vertices uncheck base group check keep in bounding regions size: bbox(0, DXSIZE) 0.001 bbox(0, DZSIZE) center: 0 bbox(0, D_YMIN) 0 (or just select all bottom vertices manually) add UV flatten node seams: (select some polys on a vertical line) axis-aligned vertex groups -> click add the 2 groups (there is some distortion at the seams, but still OK)

or

use labs auto uv grain tolerance: 0.16 (play with it, until it fits!) merge threshold: 1

or

just use uv flatten with spectral then select rectify groups of quads and shift click on front faces (this will remove the distortion, and all squares should have the same proportion)

alternativly:

create UVs first, then use taper (bend) node to taper it