Table 2 Algorithm of How to detect Skin Surface.

Algorithm 2. Detect Skin Surface
FUNCTION DetectSkinSurface():
DEFINEminSkinDensity = -449
DEFINEmaxSkinDensity = 6
CALLAlphaTable(minSkinDensity, maxSkinDensity)
FOR each tet intets:
INITairVertexCount = 0
INITairVertexIndices = [-1, -1, -1, -1]
INITskinVertices = []
GET i1, i2, i3, i4 from tet
DEFINEarr = [i1, i2, i3, i4]
FOR each idx inarr:
IFAlphaTable[density(idx)] ≡ 0:
airVertexIndices[airVertexCount] = idx
airVertexCount += 1
IFairVertexCount ≡ 1:
FOR each idx in arr:
IF idx ≠ airVertexIndices[0]:
skinVertices.append(idx)
IF skinVertices.size ≡ 3:
CALL InitSkinSurface(skinVertices[0],
skinVertices[1], skinVertices[2])