Bruit de Perlin: Terrain

On considère la surface \(S\) définit par:
  • \(S(u,v)=\left\{ \begin{array}{l} x(u,v) = u \\ y(u,v) = v \\ z(u,v) = h \, P(s (u + o), s(v +o)) \end{array} \right. \)
Le bruit de Perlin
  • \(\displaystyle P(u,v) = \sum_{k=0} ^{N} \alpha ^k \,f(2 ^k \,u, 2 ^k v)\)
  • \(N=9\)
  • \(\alpha=0.4\)
  • \(h=0.3\)
  • \(s=1\)
  • \(o=0\)
assets/reference_terrains.png
assets/parameters_terrains.png
a
b
c
d
e
f
reference
Q. Quels paramètres correspondent aux terrains (a,b,c,d,e,f) ?