Python snippets

Introduction

Here you can find small code chunks to perform miscellaneous tasks in Houdini

Import FBX into Houdini

import hou
from os import listdir
from os.path import isfile, join

dirFBX = 'P:/PROJECTS/NSI/PROD/3D/lib/ANIMATION/CHARACTERS/ROMA/FBX/' 
filesNamesFBX = [fileName for fileName in listdir(dirFBX) if isfile(join(dirFBX, fileName))]

for fileName in filesNamesFBX:
    fileFBX =  '{0}{1}'.format(dirFBX,fileName)
    if not hou.node('/obj/{}'.format(fileName)):
        hou.hipFile.importFBX(fileFBX) 

Convert imported FBX to geometry

# 256 Pipeline tools
# Convert FBX subnetwork to Geometry node
# Import FBX into Houdini, select FBX subnetwork, run script in Python Source Editor

import hou
# Get selected FBX container and scene root
FBX = hou.selectedNodes()
OBJ = hou.node('/obj/')

def checkConditions():
    '''
    Check if environment conditions allows to run script without errors
    '''
    if not FBX:  # If user select anything
        print '>> Nothing selected! Select FBX subnetwork!'
        return 0

def convert_FBX():
    '''
    Create Geometry node and import all FBX part inside
    '''
    # Create Geometry node to store FBX parts
    geometry = OBJ.createNode('geo', run_init_scripts = False)
    geometry.setName('GEO_{}'.format(FBX.name()))
    geometry.moveToGoodPosition()
    # Get all paerts inside FBX container
    geometry_FBX = [node for node in FBX.children() if node.type().name() == 'geo']
    
    # Create merge node for parts
    merge = geometry.createNode('merge')
    merge.setName('merge_parts')
    
    # Replicate FBX structure in Geometry node
    for geo in geometry_FBX: 
        # Create Object Merge node
        objectMerge = geometry.createNode('object_merge')
        objectMerge.setName(geo.name())
        # Set path to FBX part object
        objectMerge.parm('objpath1').set(geo.path())
        objectMerge.parm('xformtype').set(1)
        # Create Material node
        material = geometry.createNode('material')
        material.setName('MAT_{}'.format(geo.name()))
        # Link Material to Object Merge
        material.setNextInput(objectMerge)
        # Link part to Merge
        merge.setNextInput(material)
    
    # Set Merge Node flags to Render
    merge.setDisplayFlag(1)
    merge.setRenderFlag(1)
    # Layout geometry content in Nwtwork View 
    geometry.layoutChildren()

# Check if everything is fine and run script
if checkConditions() != 0:
    # Get FBX network
    FBX = FBX[0]
    # run conversion
    convert_FBX()
    print '>> CONVERSION DONE!'

Flatten curve

# Flatten curve: set Y coord = 0
coordList_SRC = '39.1665,0.362686,22.4173 55.3542,0.365759,10.9339'
coords = coordList_SRC.split(' ')

coordList_RES = ''
for xyz in coords:
    listXYZ_SRC = xyz.split(',')
    listXYZ_SRC = '{0},0.0,{1} '.format(listXYZ_SRC[0], listXYZ_SRC[2])
    coordList_RES += listXYZ_SRC
 
print coordList_RES