Execute string in Python ?

[vrman]

Hey guys

is there any way to execute string in python ? its my string variable :

"hou.parm('/obj/test3_FBX/materials/Google_Hybrid___7/Google_Hybrid___7_surface/map1')"

i want to use it to set a parameter , but problem is its a string.

im also tried to change it like this :

myPath = '/obj/test3_FBX/materials/Google_Hybrid___7/Google_Hybrid___7_surface/map1'
hou.parm(myPath)

in 3dsmax maxscript you can using a execute syntax before string to do it. is there a similar way in python for that ?

Edited September 14, 2017 by vrman

[davpe]

i think you need to type something like this:

hou.node('your_node').parm('parm_name').set('string_you_want')

so you first need pointer to a node, then point to a parameter you want to modify and then set a value.

cheers, D.

[vrman]

37 minutes ago, davpe said:

i think you need to type something like this:

hou.node('your_node').parm('parm_name').set('string_you_want')

so you first need pointer to a node, then point to a parameter you want to modify and then set a value.

cheers, D.

the problem is , i want to to execute that to get texture path and then use that path to set something

myPath = '/obj/test3_FBX/materials/Google_Hybrid___7/Google_Hybrid___7_surface/map1'
hou.parm(myPath)

here is the full code :

myNodes = hou.selectedNodes()
mySize = len(myNodes)
for i in range(mySize):
    myNode = '/obj/geo1/'+myNodes[i-1].name()
    myShop = (myNodes[i-1].geometry().primAttribs()[0]).name()
    myShopATT = myNodes[i-1].geometry().primStringAttribValues(myShop)[0]
    
    myPath = 'hou.parm('+'"'+myShopATT+'/'+myShopATT.replace('/obj/test3_FBX/materials/','')+'/map1")'
    print myPath    
    hou.node(myNode).parm('Texture').set(myPath)

i want to execute myPath before use it to set Texture parm.

its return this now :

but it should be like this :

Edited September 14, 2017 by vrman

[davpe]

i think these lines

myShop = (myNodes[i-1].geometry().primAttribs()[0]).name()
myShopATT = myNodes[i-1].geometry().primStringAttribValues(myShop)[0]

don't make sense. what exactly are you trying to achieve?

also, you're missing #import hou

 

Edited September 14, 2017 by davpe

[vrman]

2 minutes ago, davpe said:

i think these lines

myShop = (myNodes[i-1].geometry().primAttribs()[0]).name()
myShopATT = myNodes[i-1].geometry().primStringAttribValues(myShop)[0]

don't make sense. what exactly are you trying to achieve?

also, you're missing #import hou

 

i have 20 group prim , and there is 20 material for them , i want to get texture disk path from each material , and use it to set something .

its shelf tool , dont need import hou

[davpe]

well... I'm no python expert but I would approach it this way:

mat = hou.node('mat').children()
geo = hou.node('obj/box_object1/material1').geometry()
attrib = geo.primStringAttribValues('str')
counter = -1
for i in mat:
    counter += 1
    value = attrib[counter]
    i.parm('basecolor_texture').set('C:/'+str(value)+'.exr')

it takes string prim attribute (possibly based on group names) and returns a tuple with all the attribute values. then in loop you can insert values into texture paths on materials (or anywhere). not sure if that is exactly what you're after thou...

[f1480187]

Try this:

hou.parm('/obj/test3_FBX/materials/Google_Hybrid___7/Google_Hybrid___7_surface/map1').eval()

 

There are many ways to get and set parms in HOM. Here is some of them:

>>> hou.evalParm('/mat/principledshader1/basecolor_texture')
'C:/PROGRA~1/SIDEEF~1/HOUDIN~1.705/houdini/pic/texture/rocks001_basecolor.rat'

>>> hou.parm('/mat/principledshader1/basecolor_texture').set('C:/some/path/to/file.jpg')
>>> hou.evalParm('/mat/principledshader1/basecolor_texture')
'C:/some/path/to/file.jpg'

>>> p = hou.parm('/mat/principledshader1/basecolor_texture')
>>> p.eval()
'C:/some/path/to/file.jpg'
>>> p.set('C:/some/other/path.exr')
>>> p.eval()
'C:/some/other/path.exr'

>>> node = hou.node('/mat/principledshader1')
>>> p = node.parm('basecolor_texture')
>>> p.eval()
'C:/some/other/path.exr'
>>> p.set('Mandril.pic')
>>> p.eval()
'Mandril.pic'

 

[vrman]

1 hour ago, f1480187 said:

Try this:

hou.parm('/obj/test3_FBX/materials/Google_Hybrid___7/Google_Hybrid___7_surface/map1').eval()

 

There are many ways to get and set parms in HOM. Here is some of them:

>>> hou.evalParm('/mat/principledshader1/basecolor_texture')
'C:/PROGRA~1/SIDEEF~1/HOUDIN~1.705/houdini/pic/texture/rocks001_basecolor.rat'

>>> hou.parm('/mat/principledshader1/basecolor_texture').set('C:/some/path/to/file.jpg')
>>> hou.evalParm('/mat/principledshader1/basecolor_texture')
'C:/some/path/to/file.jpg'

>>> p = hou.parm('/mat/principledshader1/basecolor_texture')
>>> p.eval()
'C:/some/path/to/file.jpg'
>>> p.set('C:/some/other/path.exr')
>>> p.eval()
'C:/some/other/path.exr'

>>> node = hou.node('/mat/principledshader1')
>>> p = node.parm('basecolor_texture')
>>> p.eval()
'C:/some/other/path.exr'
>>> p.set('Mandril.pic')
>>> p.eval()
'Mandril.pic'

 

not working in my case , i got this "AttributeError: 'NoneType' object has no attribute 'eval'" error after running this :

    myPath = "'"+myShopATT+'/'+myShopATT.replace('/obj/test3_FBX/materials/','')+"_surface"+'/map1'+"'"
    hou.parm(myPath).eval()

 

[f1480187]

Don't add extra quotes.

[vrman]

 

4 hours ago, f1480187 said:

Don't add extra quotes.

its working now , thank you so much