On 11/17/24 06:51, William F Pokorny wrote:
> No attempt wrap the cylinder - just punching out a thin part of the 
> crackle cell outlines.

Got some coffee in me and gave the cylindrical warp a go. The crackle 
function becomes:

#declare FnCrk = function {
     pattern {
         crackle
         ip_form <-0.1,0.080,0>
         ip_strength <0.25,0.25,0.25>
         ip_repeat <5,0,0>
         ip_raw_return
         raw_wave
         scale 1/5
         scale <1/5,1,1>
         warp { cylindrical }
     }
}

(And I fattened up the cell walls for a better gradient)

Aside: I think there is a slight stretch in the wrap because the warp{} 
mapping warps often seems to want radian measures - 'scale <1/tau,1,1>' 
for best geometric mapping.

Anyhow. Image attached.

Bill P.

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