Inside or Outside?? Mesh problem

Coding Python Support
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Hi Atom !!!
Thanks for the answer !!!
I just write this code:

import bpy
import mathutils
from mathutils import Vector

def Dist(V):
    P=Vector((5,4,2))
    (V - P).length

def Choice(A):
    B=[]
    for i in range(len(A)):
        B.append(Dist(A[i]))
    M=min(B)
    I=B.index(M)
    return I

def run():
    D=[]
    cu=bpy.context.object
    me=bpy.data.meshes[cu.name]
    N=me.faces
    for i in range(len(N)):
        D.append(N[i].center)
    V=Choice(D)
    #N[V] is the nearest face to P
    a=(N[V].normal).dot((N[V].center-P))
    if (a<0):
        print("inside")
    else:
        if(a==0):
            print("face")
        else:
            print("outside")

def Start():
    run()

Now i’m not sure about the value of “a” in run function.
Thanks !!!
Edit: Hi Atom! your script seems not working in orig=mat*point… Matrix and vector are imported but …