Houdini后台输出那些事儿

几种渲染器介绍

Mantra Karma

Arnold Redshift

V-Ray RenderMan

认识环境变量HOUDINI_PATH

环境变量可以让所有扩展插件共存，HOUDINI_PATH。

# Redshift env
RS_PATH = C:/ProgramData/Redshift
PATH = $PATH;$RS_PATH/bin

HOUDINI_PATH = $RS_PATH/Plugins/Houdini/18.0.348;&

# htoa env
HTOA = M:/thirdParty/htoa/htoa-5.1.0_r9289183_houdini-18.0.348/htoa-5.1.0_r9289183_houdini-18.0.348
PATH = $PATH;$HTOA/scripts/bin
solidangle_LICENSE = 5053@localhost

# HOUDINI_PATH
HOUDINI_PATH = $HTOA;&

渲染的模式

串联与并联的区别

prepost与merge的区别

FrameByFrame与RopByRop区别

Help on method render in module houpythonportion:

render(*args, **kwargs) method of hou.RopNode instance
    render(self, frame_range=(), res=(), output_file=None,
    output_format=None, to_flipbook=False, quality=2, ignore_inputs=False,
    method=RopByRop, ignore_bypass_flags=False, ignore_lock_flags=False,
    verbose=False, output_progress=False)

后台渲染的三种方案

Houdini后台输出一般支持所有的ROP节点，比如：

  • ROP Output Driver(rop_geometry)
  • ROP Alembic Output(rop_alembic)
  • File Cache(filecache)
  • RF Mesh Export(rf_mesh_export)
  • RF Particle Export(rf_particle_export)
  • Mantra(ifd)
  • Arnold(arnold)
  • OpenGL(opengl)
  • Fetch(fetch)
  • Geometry(geometry)
  • Prepost(prepost)
  • Merge(merge)
  • Redshift(Redshift_ROP)
  • hbatch | hscript

安装路径bin文件夹下的hscript.exe和hbatch是一样的东西，没有任何区别，正常我们会使用hbatch.exe。

Usage: hbatch [-R][-e name=value][-c <command>][-j nproc][-h][-i][-q][-v][file.hip ...]

hbatch shell.  This is the non-graphical interface to a hip
file.  Type "help" for a list of commands.

Any number of .hip, .cmd, or .otl files may be specified on the
command line.  Multiple .hip files are merged together.

The -e option sets the named enviroment variable to the given
        value.  There should be no spaces around the '=' separator between
        the name and value (i.e. -e foo=bar)

The -c option will run the option argument as an hscript command, after
        the specified files have been loaded.

The -f option forces the use of asset definitions found in OTL
        files specified on the command line.

The -j option sets the HOUDINI_MAXTHREADS to the given value.
The -h option shows this message
The -q option prevents the version information from being printed
The -w option suppresses load warnings and errors from being printed
The -v option specifies verbose handling of renders
The -i option uses a simpler interface for reading input
        when running hbatch from other applications (like Pixar's
        Alfred), it may be necessary to use this option.  Use of this
        option will disable several commands (openport and atjob)
The -R option will request a non-graphics token instead
        of a graphical on

hbatch myscene.hip
Director -> help render
Director -> render mantra1

hbatch
Director -> mread myscene.hip
Director -> help render
Director -> render mantra1
  • hrender

hrender是通过csh.exe来调用的，所以得编写csh脚本。

Usage:

Single frame:   hrender    [options] driver|cop file.hip [imagefile]
Frame range:    hrender -e [options] driver|cop file.hip

driver|cop:     -c /img/imgnet
                -c /img/imgnet/cop_name
                -d output_driver

options:        -w pixels       Output width
                -h pixels       Output height
                -F frame        Single frame
                -b fraction     Image processing fraction (0.01 to 1.0)
                -t take         Render a specified take
                -o output       Output name specification
                -v              Run in verbose mode
                -I              Interleaved, hscript render -I

with "-e":      -f start end    Frame range start and end
                -i increment    Frame increment

Notes:  1)  For output name use $F to specify frame number (e.g. -o $F.pic).
        2)  If only one of width (-w) or height (-h) is specified, aspect ratio
            will be maintained based upon aspect ratio of output driver.

批量渲染多个hip文件，将下面文件保存成.csh文件

#!C:/PROGRA~1/SIDEEF~1/HOUDIN~1.378/bin/csh.exe -f
hrender -e -f 1 5 -v -d /obj/ropnet1/mantra1 D:/test/test1.hip
hrender -e -f 1 10 -v -d /obj/ropnet1/mantra1 D:/test/test2.hip
  • hython

自从Houdini引入Python接口之后，逐渐Python成为了HScript的替代品。

usage: hython [hip_files] [options] ... [-c cmd | -m mod | file | -] [arg] ...
Extra options supported by hython:
-b     : enable background openport command processing
-j arg : sets HOUDINI_MAXTHREADS to the given value;
        arg is the max number of threads

Regular Python options:
usage: hython [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : debug output from parser; also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also --help)
-i     : inspect interactively after running script; forces a prompt even
        if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO    : remove doc-strings in addition to the -O optimizations
-R     : use a pseudo-random salt to make hash() values of various types be
        unpredictable between separate invocations of the interpreter, as
        a defense against denial-of-service attacks
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x
        see man page for details on internal buffering relating to '-u'
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
        can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno
        also PYTHONWARNINGS=arg
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-3     : warn about Python 3.x incompatibilities that 2to3 cannot trivially fix
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH   : ';'-separated list of directories prefixed to the
            default module search path.  The result is sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>;<exec_prefix>).
            The default module search path uses <prefix>\lib.
PYTHONCASEOK : ignore case in 'import' statements (Windows).
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.
PYTHONHASHSEED: if this variable is set to 'random', the effect is the same
as specifying the -R option: a random value is used to seed the hashes of
str, bytes and datetime objects.  It can also be set to an integer
in the range [0,4294967295] to get hash values with a predictable seed.
[Redshift]Closing the RS instance. End of the plugin log system.

hython myscene.hip
rnode = hou.node("/out/mantra1")
help(rnode)
rnode.render()

hython
import hou
hou.hipFile.load(myscene.hip)
rnode = hou.node("/out/mantra1")
help(rnode)
rnode.render()

hython -c "hou.hipFile.load('hip文件路径'); ropNode = hou.node('输出节点路径'); ropNode.render(frame_range=(1, 10), verbose=True)"
hython rRop.py

认识hou模块

hou模块可以分为三大类sub-modules、classes、functions。

  • sub-modules：首字母小写，不带括号为module，module可能又有classes以及functions。
  • classes：首字母大写，不带括号为class。class必须实例化使用，class的属性以及方法必须通过实例化对象调用。
  • functions：首字母小写，带括号为function。

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