I want to get a matrix of Normal axix of selected face.

Coding Python Support
1

I want to get a matrix_world.


Is it possible?

    f_selected = obj.data.polygons[0]

z = Vector((0,0,1))
angle = f_selected.normal.angle(z)
axis = z.cross(f_selected.normal)
mat_world_rot = Matrix.Rotation(angle, 4, axis)

How to get a matrix_world of normal axis of selected face.

Please answer to me.
Thank you.

2

well, that’s already the formula, just multiply with matrix_world of the object. Although there’s no real definition of a matrix for a vector

import bpy
from mathutils import Vector, Matrix

ob = bpy.context.object

if ob.type != 'MESH':
    raise TypeError
    
me = ob.data
ob.update_from_editmode()

if len(me.polygons) < 1:
    raise ValueError

polys = me.polygons
poly_active = polys[polys.active]

z = Vector((0,0,1))
angle = poly_active.normal.angle(z)
axis = z.cross(poly_active.normal)
mat = Matrix.Rotation(angle, 4, axis)
mat_world = ob.matrix_world * mat

print(mat_world)
2 Likes
3

Thank you your reply.