Le 2020-04-30 à 20:10, Josh a écrit :
> "Josh" <nomail@nomail> wrote:
>> I've found a way to create and use a df3 file as an isosurface. Works well. I'm
>> trying now to add noise to it and it makes the shape disappear. Any ideas? The
>> shape shows up fine without the +f_noise3d(x,y,z)*2 statement... Does anyone
>> know what is happening?
>>
>> #include "functions.inc"
>> #declare Fnct00 = function {
>>      pattern { density_file df3 "aster1.df3" interpolate 0
>>      }
>> }
>> #declare Fnct01 = function (x,y,z) {
>>      0.025-Fnct00(x,y,z)
>> }
>> #declare BaryteGreen = srgb <0.6157,0.7686,0.3725>;
>> #declare Iso00 = isosurface {
>>      function { Fnct01(x,y,z) + f_noise3d(x,y,z)*2}
>>      contained_by { box { -5,5 } }
>>      threshold 0
>>      accuracy 0.0005
>>      max_gradient 6
>>      all_intersections
>>      texture {
>>        pigment { color BaryteGreen }
>>        finish { ambient <0.03,0.02,0.0> diffuse 0.8,0.4 phong 0.7 }
>>      }
>> }
>>
>> Josh
> 
> Just to clarify, I've tried adding f_noise3d, subtracting it, nothing seems to
> allow me to perturb the surface of my df3 shape like I can if my function is
> just a simple sphere...
> 
> Josh
> 
> 

Play with the coordinates passed to the function and see what happen.

A starting point :
function { Fnct01(x+sin(y*2+z*3),y-cos(x*7),z+cos(y*5)) }

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