question

Geordie Moffatt avatar image
Geordie Moffatt asked ·

How to render VDB volumes in Solaris

Hi all, just got Houdini 18.9.416 and HtoA 5.2.1 working.

Saw this in the new features list:

"Volume rendering with support for OpenVDB and particles."

I know this may not directly apply to the Arnold USD delegate, but looking here it says VDB assets are supported.

I have a Solaris scene setup that imports a VDB as a USD volume with fieldName = density. The VDB is rendering using Houdini GL with Solaris, but nothing with Arnold. I've assigned an Arnold Standard Volume shader to the volume and made sure I can see a simple sphere in Arnold so the renderer is working for geo.


I also get this error when Arnold first tries to render the VDB volume:

[HdArnold] Cannot load _htoa_pygeo library required for volume rendering in Solaris


I've attached my simple HIP file:

USDVolArnoldTest01.zip


Any got VDB volumes to render through Arnold in Solaris?


TNKS!

G


htoahtoa arnold houdiniusdvdb
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Nathan Mooth avatar image
Nathan Mooth answered ·

Several people have already posted their environments, and cross-referencing them with the documentation they seem to be set up correctly. Was there some other part of the environment you needed to see?

My studio is also experiencing this issue and we have a pretty solid Houdini setup so I rather doubt that this is an environment issue. Any other ideas?

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Ahmed Hindy avatar image
Ahmed Hindy answered ·

same problem, I can render the same stuff no issues in OBJ level, and I can also render the same stuff with karma in LOPs but Arnold in LOPs specifically gives me this error

[HdArnold] Cannot load _htoa_pygeo library required for volume rendering in Solaris


here is my Houdini.env

#
# Houdini Environment Settings
#
# The contents of this file are read into the environment
# at startup.  They will override any existing entries in
# the environment.
#
# The syntax is one entry per line as follows:
#    VAR = VALUE
#
# Values may be quoted
#    VAR = "VALUE"
#
# Values may be empty
#    VAR = 
#

# Example:
#
HOUDINI_NO_SPLASH = 1

#ARNOLD
PATH = "$PATH;C:\Users\masra\htoa\htoa-5.6.0.2_rbd4662c_houdini-18.5.462\htoa-5.6.0.2_rbd4662c_houdini-18.5.462\scripts\bin"
HOUDINI_PATH = "C:\Users\masra\htoa\htoa-5.6.0.2_rbd4662c_houdini-18.5.462\htoa-5.6.0.2_rbd4662c_houdini-18.5.462;&"


## REDSHIFT
HOUDINI_DSO_ERROR = 2
PATH = "C:/ProgramData/Redshift/bin;$PATH"
HOUDINI_PATH = "$HOUDINI_PATH;C:/ProgramData/Redshift/Plugins/Houdini/18.5.462;&"
PXR_PLUGINPATH_NAME="C:\ProgramData\Redshift\Plugins\Solaris\18.5.462;&"


##OCIO
OCIO ="C:\Program Files\Nuke12.2v2\plugins\OCIOConfigs\configs\aces_1.1\config.ocio"


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Andres Kluge avatar image
Andres Kluge answered ·

Hi,

im having the same problem. Using the package json files to setup the environment, and its loading packages inside packages. But disabled all of that for test.

the only thing in the houdini.env at the moment is straight from the installation page:

"

PATH = "$PATH;C:/htoa/htoa-5.4.0_r1db094a_houdini-18.0.566/htoa-5.4.0_r1db094a_houdini-18.0.566/scripts/bin"

HOUDINI_PATH = "C:/htoa/htoa-5.4.0_r1db094a_houdini-18.0.566/htoa-5.4.0_r1db094a_houdini-18.0.566;&"

"

Windows 10 and Houdini 18.0.566


thanks,

andres



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Pal Mezei avatar image
Pal Mezei answered ·

Hi Geordie,


The Arnold Render Delegate uses a Houdini library to run Houdini specific code, and the warning you are seeing is an indication that it can't find the library with the functions required.


I assume this would happen due to an incorrect environment, could you please share your houdini.env and your Houdini env info (go to help, about Houdini, press show details and use save to export everything)?


Cheers,

Pal.

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