Automating rops with python

[Christoph_H]

Hi,

Is it possible to render all existing rops and also rops in obj levels one after the other?
So without manual links?

It is a file with over 100 different rops.

Can i achieve in hscript that a rop in an obj level takes the name of the obj level?

thanks.

Edited May 14, 2018 by Christoph_H

[Christoph_H]

This page shows the principle:
http://www.tokeru.com/cgwiki/index.php?title=HoudiniPython#press_.27save_to_disk.27_on_a_rop

My problem is that I have no experience with python. I'm just starting to get along with vex.

It would be very nice to give me a hint.
How should the script look like, with which I manage to create my own “mantra rop” with “output path with object names” from the selected objects?
Could I set the scene floor to be added to each one?

thanks.

[bunker]

here is a simple example to render all Mantra ROPs:

#find all nodes of type 'ifd' (Mantra) in the 'driver' context (ROP)
for i in hou.nodeTypeCategories()["Driver"].nodeTypes()["ifd"].instances():
    # display their full path
    print "render: " , i.path()
    # press the 'Render to Disk' Button
    i.parm("execute").pressButton()

render_all_mantra_rop_bunker.hipnc

[bunker]

and this creates a mantra node per selected object and set the image output path based on the node name:

# before running the script, select "a,b,c" nodes
ropnet = hou.node('/obj/ropnet1')

# delete all nodes inside ropnet1
for i in ropnet.children():
    i.destroy()

# create a mantra node for each selected node
for i in hou.selectedNodes():
    n = i.name()
    m = ropnet.createNode("ifd")
    m.setName("mantra_"+n)
    m.parm("vm_picture").set("/tmp/myfilepath/"+n+".$"+"F4.exr")

render_all_mantra_rop_bunker2.hipnc
 

[Christoph_H]

many thanks. very helpful.

How is it possbile to exclude the null object from script?

Edited May 18, 2018 by Christoph_H

[bunker]

you can put that script on a shelf button if you prefer, same thing.
if you mean exclude the null from all the selected nodes, you can filter by node types:

# filter out all null nodes
for i in hou.selectedNodes():
  if i.type().name()!='null':
    m = ropnet.createNode("ifd")
    m.setName("mantra_"+n)
    m.parm("vm_picture").set("/tmp/myfilepath/"+n+".$"+"F4.exr")
    

Edited May 19, 2018 by bunker

[Christoph_H]

hi,
yes this is what i meant.
I added your new line but this will not work. What am I doing wrong?

thanks.

[bunker]

hard to tell without a hip file.

[Christoph_H]

ok. Here it is.

 

render_all_mantra_rop_exclude_problem.hipnc

Edited May 30, 2018 by Christoph_H

[bunker]

you were missing the indent block after the "if" statement:
render_all_mantra_rop_fixed.hipnc

[Christoph_H]

many thanks. I have to learn python next.