def normalVertex2D(vprev, v, vnext):
vec1 = vec.subtract(v, vprev)
vec1 = vec.unitize(vec1)
vec2 = vec.subtract(vnext, v)
vec2 = vec.unitize(vec1)
n = vec.add(vec1, vec2)
n = vec.scale(n, 0.5)
t = n.x
n.x = -n.y
n.y = t
return n
def shapeProfile(mesh):
zFunction = SinusFunction(zFreq, zAmp, zPhase, zOffset)
for v in mesh.vertices:
pos_z = (v.z/300.0)*2*math.pi
val_z = zFunction.getValue(pos_z)
normal = vec.subtract(v, Vertex(0, 0, v.z))
normal = vec.unitize(normal)
nvec = vec.scale(normal, val_z)
v.add(nvec)
return mesh
def normalFromTriangle(v1,v2,v3):
"""
Returns the normal of a triangle defined by 3 vertices.
The normal is a vector of length 1 perpendicular to the plane of the triangle.
Arguments:
----------
v1, v2, v3 : mola.core.Vertex
the vertices get the normal from
"""
v = vec.subtract(v2, v1)
u = vec.subtract(v3, v1)
crossProduct=vec.cross(v, u)
return vec.unitize(crossProduct)
def normalEdge2D(vprev, v):
vec1 = vec.subtract(v, vprev)
vec1 = vec.unitize(vec1)
return vec.rot2D90(vec1)
def normalFromTriangle(v1, v2, v3):
v = _vec.subtract(v2, v1)
u = _vec.subtract(v3, v1)
crossProduct = _vec.cross(v, u)
return _vec.unitize(crossProduct)