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imports :

import bpy from mathutils import Vector

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Add a Cube and Get the initial local coordinates of vertex id 0,

Get the initial Cube matrix_world,

Calculate the initial vertex id 0 Global Coordinates :

bpy.ops.mesh.primitive_cube_add() Cube = bpy.context.object Mw = Cube.matrix_world Vert0_Lco = Cube.data.vertices[0].co Vert0_Gco = Mw @ Vert0_Lco

print (f"Vert 0 initial Local coordinates :\n{Vert0_Lco}") # should be (-1, -1, -1) print (f"Cube initial Matrix world :\n{mw}") # should be the identity Matrix print (f"Vert 0 initial Global coordinates :\n{Vert0_Gco}") # should be (-1, -1, -1) also

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Make a translation vector :

Translate the cube,

Get the final Cube matrix_world,

Calculate the final vertex id 0 Global Coordinates :

Trans_Vector = Vector((1,3,5))

'''Now If you want the Cube matrix_world to be updated after the translation transform dont use<<< Cube.location = Trans_Vector >>>, instead use :'''

Mw.translation += Trans_Vector

print (f"Vert 0 final Local coordinates :\n{Vert0_Lco}")#Should be the same ( (-1, -1, -1) dont change after transform) print (f"Cube final Matrix world :\n{mw}") # should change to : ''' Matrix(((1, 0, 0, 1 ) (0, 1, 0, 3 ) (0, 0, 1, 5 ) (0, 0, 0, 1 ))) ''' print (f"Vert 0 final Global coordinates :\n{Vert0_Gco}") # should change to (0, 2, 4)