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This page provides information on the Post Translate tab of the V-Ray Renderer settings.

Overview

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The Post Translate tab exposes options for Python Post Translate of .vrscenes. You can import a script file or write a script directly in Houdini to control plugin parameters.

The V-Ray for Houdini's Post Translate support is based on AppSDK Python binding. 

UI Paths:

||out Network|| > V-Ray > V-Ray Renderer > Post Translate tab

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V-Ray menu > Render Settings > Post Translate tab

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Main Parameters

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Section
Column width 60%55% Use File – Enable to use a Python post-translate file. File – Adds a Python post-translate file. Use Script – Enable to use a Python post-translate script. Script (Python) – Adds a Python post-translate script. Column width 5%   Column width 35%45% Image RemovedImage Added

Advanced Parameters

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Section

Column width 60%55% File – Shows the number of post-translate files. Add – Adds another instance. Delete– Removes last instance. Clear – Clears all instances. Remove – Removes a post-translate file. Insert Before – Inserts a post-translate file before the current file. Use – Enable to use the post-translate file. File (*.py) – Adds a post-translate file. Column width 5%   Column width 35%45% Image Removed

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Image Added

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Example: List Scene Plugins

import os
import vray
from vfh import vfh_utils

with vray.VRayRenderer() as renderer:
    for plugin in renderer.plugins:
        vfh_utils.logInfo('plugin ' + plugin.getName() + ' (class ' + plugin.getType() + '):\n')

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Example: Change Color

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Code Block
import vray r = vray.VRayRenderer() p = r.plugins["|mat|vrayMaterialBuilder|vrayMtl"] p.diffuse = vray.AColor(0, 1, 1, 1)

 

 

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Example: Automatically Switch off Displacement for Phantom objects

import vray

from vfh import vfh_utils

renderer = vray.VRayRenderer()

for node in renderer.plugins:
    if node.getType() != 'Node':
        continue
    if not node.object_properties:
        continue

    objProps = node.object_properties
    needFix = objProps.camera_visibility == 0 or objProps.matte_surface == 1
    if not needFix:
        continue

    instancer = node.geometry
    if not instancer.instances:
        continue

    for instance in instancer.instances[1:]: # First item is time
        instancedNode = instance[-1] # Node is last
        if type(instancedNode) is not vray.Plugin:
            continue
        if instancedNode.getType() != 'Node':
            continue
        if instancedNode.geometry.getType() in {'GeomDisplacedMesh', 'GeomStaticSmoothedMesh' }:
            instancedNode.geometry = instancedNode.geometry.mesh

            vfh_utils.syslog("Disabling displacement for \'%s\"" % instancedNode)

Here, you can check how the script changes the render. 

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Example: Convert textures to TX format before rendering

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Code Block

import os import vray import subprocess from vfh import vfh_utils def convertToTX(f): make_tx = os.path.join(os.environ['VRAY_APPSDK'], 'bin', 'maketx.exe') cmdArgs = [ make_tx, f ] call = ' '.join(cmdArgs) proc = subprocess.Popen(call, universal_newlines=True) proc.communicate() return os.path.splitext(f)[0] + '.tx' with vray.VRayRenderer() as renderer: for plugin in renderer.plugins: if (plugin.getType() == 'BitmapBuffer'): if(os.path.splitext(plugin.file)[1] != '.tx'): if( not os.path.exists(os.path.splitext(plugin.file)[0] + '.tx')): plugin.file = convertToTX(plugin.file) else: plugin.file = os.path.splitext(plugin.file)[0] + '.tx'