# yade-users team mailing list archive

## Re: [Question #681341]: Move or scale a facet

```Question #681341 on Yade changed:

gaoxuesong confirmed that the question is solved:
Thanks. I have tried to move and scale a facet. For moving a facet, just changing the position is feasible. But for scaling a facet, just multiplying a scaling factor is not feasible. The vertice coordinates can not be changed directly, like the tuple and string in python, i think.
Following is the code i used,

c = qt.Controller()
O.bodies.clear()
### 2 initial facet ###
v1 =(0,0,0)
v2 = (1,0,0)
v3 =(1,1,0)
f1 = facet((v1,v2,v3),wire=False)
O.bodies.append(f1)
v1 =(2,0,0)
v2 = (3,0,0)
v3 =(3,1,0)
f1 = facet((v1,v2,v3),wire=False)
O.bodies.append(f1)

## move facet 1
fcet1 = O.bodies[0]
mv = (1,0,0)
fcet1.state.pos += mv
## succeed ###
## scale vertices
for ev in fcet1.shape.vertices:
for i in range(3):
ev[i] *= 0.5
## failed, the vertices can not be changed
## then try to construct a new facet using the scaled and translated vertices
vg = []
for ev in fcet1.shape.vertices:
vgi = fcet1.state.pos+fcet1.state.ori*ev ## global coordinates
vg.append(vgi)
print(vg)
for each in vg:
for i in range(3):
each[i] *= 0.5
if i == 1: ## translate in y direction by 2.0
each[i] += 2.0
print(vg)
## construct the new facet and remove the old one
f1 = facet((vg[0],vg[1],vg[2]),wire=False)
O.bodies.append(f1)
O.bodies.erase(fcet1.id)

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