def wrangle_medium(medium):
"""Output a NamedMedium from the input oppath"""
if not medium:
return None
if medium in scene_state.medium_nodes:
return None
scene_state.medium_nodes.add(medium)
medium_vop = BaseNode.from_node(medium)
if medium_vop is None:
return None
if medium_vop.directive != "medium":
return None
with api.AttributeBlock():
coord_sys = medium_vop.coord_sys
if coord_sys:
api.Transform(coord_sys)
colorspace = medium_vop.colorspace
if colorspace:
api.ColorSpace(colorspace)
api.MakeNamedMedium(
medium_vop.path, medium_vop.directive_type, medium_vop.paramset
)
return medium_vop.path
def medium_prim_paramset(prim, paramset=None):
"""Build a ParamSet of medium values based off of hou.Prim attribs"""
medium_paramset = ParamSet(paramset)
# NOTE:
# Testing for prim attribs on each prim is a bit redundat but
# in general its not an issue as you won't have huge numbers of
# volumes. If this does become an issue, attribs can be stored in
# a dict and searched from there. (This includes evaluating the
# pbrt_interior node.
# Initialize with the interior shader on the prim, if it exists.
try:
interior = prim.stringAttribValue("pbrt_interior")
interior = BaseNode.from_node(interior)
except hou.OperationFailed:
interior = None
if interior and interior.directive_type == "pbrt_medium":
medium_paramset |= interior.paramset
try:
preset_value = prim.stringAttribValue("preset")
if preset_value:
medium_paramset.replace(PBRTParam("string", "preset",
preset_value))
except hou.OperationFailed:
pass
try:
g_value = prim.floatAttribValue("g")
medium_paramset.replace(PBRTParam("float", "g", g_value))
except hou.OperationFailed:
pass
try:
scale_value = prim.floatAttribValue("scale")
medium_paramset.replace(PBRTParam("float", "scale", scale_value))
except hou.OperationFailed:
pass
try:
sigma_a_value = prim.floatListAttribValue("sigma_a")
if len(sigma_a_value) == 3:
medium_paramset.replace(PBRTParam("rgb", "sigma_a", sigma_a_value))
except hou.OperationFailed:
pass
try:
sigma_s_value = prim.floatListAttribValue("sigma_s")
if len(sigma_s_value) == 3:
medium_paramset.replace(PBRTParam("rgb", "sigma_s", sigma_s_value))
except hou.OperationFailed:
pass
return medium_paramset
def wrangle_preworld_medium(obj, wrangler, now):
"""Output a NamedMedium from the input oppath"""
# Due to PBRT's scene description we can't use the standard wrangle_medium
# when declaring a medium and its transform/colorspace when attached to a
# camera. This is because we don't have AttributeBegin/End blocks to pop
# the stack, so when we declare the transform for the medium we need to so
# with respect to being in the camera's coordinate system. We'll extract
# the translates from the camera, to establish a pivot.
medium = obj.wrangleString(wrangler, "pbrt_exterior", now, [None])[0]
if not medium:
return None
if medium in scene_state.medium_nodes:
return None
scene_state.medium_nodes.add(medium)
medium_vop = BaseNode.from_node(medium)
if medium_vop is None:
return None
if medium_vop.directive != "medium":
return None
coord_sys = medium_vop.coord_sys
if coord_sys:
cam_xform = hou.Matrix4(
get_transform(obj, now, invert=False, flipz=False))
cam_pivot = cam_xform.extractTranslates()
cam_pivot = hou.hmath.buildTranslate(cam_pivot).inverted()
xform = hou.Matrix4(coord_sys)
xform *= cam_pivot
api.Transform(xform.asTuple())
colorspace = medium_vop.colorspace
if colorspace:
api.ColorSpace(colorspace)
api.MakeNamedMedium(medium_vop.path, medium_vop.directive_type,
medium_vop.paramset)
api.Identity()
# Restore Colorspace if one was set on the Medium
if colorspace:
scene_cs = []
if obj.evalString("pbrt_colorspace", now, scene_cs):
scene_cs = scene_cs[0]
else:
scene_cs = "srgb"
if scene_cs != colorspace:
api.ColorSpace(scene_cs)
return medium_vop.path
def process_full_pt_instance_medium(instance_info, medium_type):
gdp = instance_info.gdp
if medium_type not in ("interior", "exterior"):
return None, None
medium_attrib_h = gdp.attribute("geo:point", "pbrt_" + medium_type)
if medium_attrib_h < 0:
return None, None
medium = gdp.value(medium_attrib_h, instance_info.number)[0]
# an empty string is valid here as it means no medium
if medium == "":
return medium, ParamSet()
suffix = ":%s[%i]" % (instance_info.source, instance_info.number)
medium_node = BaseNode.from_node(medium)
medium_node.path_suffix = suffix
if not (medium_node and medium_node.directive_type == "pbrt_medium"):
return None, None
medium_paramset = ParamSet(medium_node.paramset)
# TODO: Currently both this and the geometry overrides
# for mediums only support "rgb" and not spectrums.
parms = {
"sigma_a": "rgb",
"sigma_s": "rgb",
"preset": "string",
"g": "float",
"scale": "float",
}
for parm, ptype in parms.iteritems():
attrib_name = "%s_%s" % (medium_type, parm)
attrib_h = gdp.attribute("geo:point", attrib_name)
if attrib_h < 0:
continue
# TODO: Checks?
# attrib_size = gdp.attribProperty(attrib_h, "geo:vectorsize")[0]
# attrib_storage = gdp.attribProperty(attrib_h, "geo:storage")[0]
val = gdp.value(attrib_h, instance_info.number)
medium_paramset.replace(PBRTParam(ptype, parm, val))
# We might be outputing a named medium even if its not going to be needed
# as in the case of instancing volume prims
api.MakeNamedMedium(medium_node.full_name, "homogeneous", medium_paramset)
return medium_node.full_name, medium_paramset
def process_full_pt_instance_medium(instance_info, medium_type):
gdp = instance_info.gdp
if medium_type not in ("interior", "exterior"):
return None, None
medium_attrib_h = gdp.attribute("geo:point", "pbrt_" + medium_type)
if medium_attrib_h < 0:
return None, None
medium = gdp.value(medium_attrib_h, instance_info.number)[0]
# an empty string is valid here as it means no medium
if medium == "":
return medium, ParamSet()
suffix = ":%s:%i" % (instance_info.source, instance_info.number)
medium_node = BaseNode.from_node(medium)
medium_node.path_suffix = suffix
if not (medium_node and medium_node.directive == "medium"):
return None, None
medium_paramset = ParamSet(medium_node.paramset)
# Look for attributes to create an override dictionary
pt_attribs = gdp.globalValue("geo:pointattribs")
overrides = {}
for attrib in pt_attribs:
if not attrib.startswith("{}_".format(medium_type)):
continue
if attrib in ("pbrt_interior", "pbrt_exterior"):
continue
parm_name = attrib.split("_", 1)[1]
attrib_h = gdp.attribute("geo:point", attrib)
if attrib_h < 0:
continue
val = gdp.value(attrib_h, instance_info.number)
overrides[parm_name] = val
if overrides:
medium_paramset.update(medium_node.override_paramset(overrides))
# We might be outputing a named medium even if its not going to be needed
# as in the case of instancing volume prims
api.MakeNamedMedium(
medium_node.full_name, medium_node.directive_type, medium_paramset
)
return medium_node.full_name, medium_paramset
def output_medium(medium):
"""Output a NamedMedium from the input oppath"""
if not medium:
return None
if medium in scene_state.medium_nodes:
return None
scene_state.medium_nodes.add(medium)
medium_vop = BaseNode.from_node(medium)
if medium_vop is None:
return None
if medium_vop.directive_type != "pbrt_medium":
return None
api.MakeNamedMedium(medium_vop.path, "homogeneous", medium_vop.paramset)
return medium_vop.path
def wrangle_shading_network(node_path, name_prefix='', saved_nodes=None):
# Depth first, as textures/materials need to be
# defined before they are referenced
# Use this to track if a node has been output or not.
# if the saved_nodes is None, we use the global scene_state
# otherwise we use the one passed in. This is useful for outputing
# named materials within a nested Attribute Block.
if saved_nodes is None:
saved_nodes = scene_state.shading_nodes
prefix_node_path = name_prefix + node_path
if prefix_node_path in saved_nodes:
return
saved_nodes.add(prefix_node_path)
hnode = hou.node(node_path)
# Material or Texture?
node = BaseNode.from_node(hnode)
if node is None:
return
if node.directive == 'material':
api_call = api.MakeNamedMaterial
elif node.directive == 'texture':
api_call = api.Texture
else:
return
for node_input in node.inputs():
wrangle_shading_network(node_input, name_prefix=name_prefix, saved_nodes=saved_nodes)
coord_sys = node.coord_sys
if coord_sys:
api.TransformBegin()
api.Transform(coord_sys)
api_call(name_prefix + node.name,
node.output_type,
node.directive_type,
node.paramset)
if coord_sys:
api.TransformEnd()
if api_call == api.MakeNamedMaterial:
print()
return
def wrangle_geo(obj, wrangler, now):
parm_selection = {
'object:soppath' : SohoPBRT('object:soppath', 'string', [''], skipdefault=False),
# NOTE: In order for shop_materialpath to evaluate correctly when using (full) instancing
# shop_materialpath needs to be a 'shaderhandle' and not a 'string'
# TODO: However this does not seem to apply to shop_materialpaths on the instance points.
'shop_materialpath' : SohoPBRT('shop_materialpath', 'shaderhandle', skipdefault=False),
'pbrt_rendersubd' : SohoPBRT('pbrt_rendersubd', 'bool', [False], False),
'pbrt_subdlevels' : SohoPBRT('pbrt_subdlevels', 'integer', [3], False, key='levels'),
'pbrt_computeN' : SohoPBRT('pbrt_computeN', 'bool', [True], False),
# The combination of None as a default as well as ignore defaults being False is
# important. 'None' implying the parm is missing and not available, and '' meaning
# a vacuum medium.
# We can't ignore defaults since a default might be the only way to set a medium
# back to a vacuum.
'pbrt_interior' : SohoPBRT('pbrt_interior', 'string', [None], False),
'pbrt_exterior' : SohoPBRT('pbrt_exterior', 'string', [None], False),
'pbrt_ignorevolumes' : SohoPBRT('pbrt_ignorevolumes', 'bool', [False], True),
'pbrt_ignorematerials' : SohoPBRT('pbrt_ignorematerials', 'bool', [False], True),
'pbrt_splitdepth' : SohoPBRT('pbrt_splitdepth', 'integer', [3], True, key='splitdepth'),
# We don't use the key=type since its a bit too generic of a name
'pbrt_curvetype' : SohoPBRT('pbrt_curvetype', 'string', ['flat'], True),
'pbrt_include' : SohoPBRT('pbrt_include', 'string', [''], False),
'pbrt_alpha_texture' : SohoPBRT('pbrt_alpha_texture', 'string', [''],
skipdefault=False, key='alpha'),
'pbrt_shadowalpha_texture' : SohoPBRT('pbrt_shadowalpha_texture', 'string', [''],
skipdefault=False, key='shadowalpha'),
# TODO, Tesselation options?
}
properties = obj.evaluate(parm_selection, now)
if 'shop_materialpath' not in properties:
shop = ''
else:
shop = properties['shop_materialpath'].Value[0]
if shop and shop in scene_state.shading_nodes:
api.NamedMaterial(shop)
interior = None
exterior = None
if 'pbrt_interior' in properties:
interior = properties['pbrt_interior'].Value[0]
if 'pbrt_exterior' in properties:
exterior = properties['pbrt_exterior'].Value[0]
# We only output a MediumInterface if one or both of the parms exist
if interior is not None or exterior is not None:
interior = '' if interior is None else interior
exterior = '' if exterior is None else exterior
api.MediumInterface(interior, exterior)
for prop in ('alpha', 'shadowalpha'):
alpha_tex = properties[prop].Value[0]
alpha_node = BaseNode.from_node(alpha_tex)
if ( alpha_node and
alpha_node.directive == 'texture' and
alpha_node.output_type == 'float'):
if alpha_node.path not in scene_state.shading_nodes:
wrangle_shading_network(alpha_node.path, saved_nodes=set())
else:
# If the passed in alpha_texture wasn't valid, clear it so we don't add
# it to the geometry
if alpha_tex:
api.Comment('%s is an invalid float texture' % alpha_tex)
properties[prop].Value[0] = ''
if properties['pbrt_include'].Value[0]:
# If we have included a file, skip output any geo.
api.Include(properties['pbrt_include'].Value[0])
return
soppath = properties['object:soppath'].Value[0]
if not soppath:
api.Comment('Can not find soppath for object')
return
Geo.output_geo(soppath, now, properties)
return
def wrangle_geo(obj, wrangler, now):
parm_selection = {
"object:soppath": SohoPBRT("object:soppath", "string", [""], skipdefault=False),
"ptinstance": SohoPBRT("ptinstance", "integer", [0], skipdefault=False),
# NOTE: In order for shop_materialpath to evaluate correctly when using
# (full) instancing shop_materialpath needs to be a 'shaderhandle'
# and not a 'string'
# NOTE: However this does not seem to apply to shop_materialpaths on the
# instance points and has to be done manually
"shop_materialpath": SohoPBRT(
"shop_materialpath", "shaderhandle", skipdefault=False
),
"pbrt_rendersubd": SohoPBRT("pbrt_rendersubd", "bool", [False], False),
"pbrt_subdlevels": SohoPBRT(
"pbrt_subdlevels", "integer", [3], False, key="levels"
),
"pbrt_computeN": SohoPBRT("pbrt_computeN", "bool", [True], False),
"pbrt_reverseorientation": SohoPBRT(
"pbrt_reverseorientation", "bool", [False], True
),
# The combination of None as a default as well as ignore defaults being False
# is important. 'None' implying the parm is missing and not available,
# and '' meaning a vacuum medium.
# We can't ignore defaults since a default might be the only way to set a
# medium back to a vacuum.
"pbrt_interior": SohoPBRT("pbrt_interior", "string", [None], False),
"pbrt_exterior": SohoPBRT("pbrt_exterior", "string", [None], False),
"pbrt_ignorevolumes": SohoPBRT("pbrt_ignorevolumes", "bool", [False], True),
"pbrt_ignorematerials": SohoPBRT("pbrt_ignorematerials", "bool", [False], True),
"pbrt_splitdepth": SohoPBRT(
"pbrt_splitdepth", "integer", [3], True, key="splitdepth"
),
# We don't use the key=type since its a bit too generic of a name
"pbrt_curvetype": SohoPBRT("pbrt_curvetype", "string", ["flat"], True),
"pbrt_include": SohoPBRT("pbrt_include", "string", [""], False),
"pbrt_alpha_texture": SohoPBRT(
"pbrt_alpha_texture", "string", [""], skipdefault=False, key="alpha"
),
"pbrt_shadowalpha_texture": SohoPBRT(
"pbrt_shadowalpha_texture",
"string",
[""],
skipdefault=False,
key="shadowalpha",
),
# TODO, Tesselation options?
}
properties = obj.evaluate(parm_selection, now)
if "shop_materialpath" not in properties:
shop = ""
else:
shop = properties["shop_materialpath"].Value[0]
# NOTE: Having to track down shop_materialpaths does not seem to be a requirement
# with Mantra or RenderMan. Either its because I'm missing some
# logic/initialization either in Soho or in the Shading HDAs. Or there is
# some hardcoding in the Houdini libs that know how to translate
# shop_materialpath point aassignments to shaders directly through a
# SohoParm. Until that is figured out, we'll have to do it manually.
interior = None
exterior = None
if "pbrt_interior" in properties:
interior = properties["pbrt_interior"].Value[0]
if "pbrt_exterior" in properties:
exterior = properties["pbrt_exterior"].Value[0]
if "pbrt_reverseorientation" in properties:
if properties["pbrt_reverseorientation"].Value[0]:
api.ReverseOrientation()
pt_shop_found = False
if properties["ptinstance"].Value[0] == 1:
instance_info = Instancing.get_full_instance_info(obj, now)
properties[".instance_info"] = instance_info
if instance_info is not None:
pt_shop_found = process_full_pt_instance_material(instance_info)
interior, interior_paramset = process_full_pt_instance_medium(
instance_info, "interior"
)
exterior, exterior_paramset = process_full_pt_instance_medium(
instance_info, "exterior"
)
if interior_paramset is not None:
properties[".interior_overrides"] = interior_paramset
# If we found a point shop, don't output the default one here.
if shop in scene_state.shading_nodes and not pt_shop_found:
api.NamedMaterial(shop)
# We only output a MediumInterface if one or both of the parms exist
if interior is not None or exterior is not None:
interior = "" if interior is None else interior
exterior = "" if exterior is None else exterior
api.MediumInterface(interior, exterior)
for prop in ("alpha", "shadowalpha"):
alpha_tex = properties[prop].Value[0]
alpha_node = BaseNode.from_node(alpha_tex)
if (
alpha_node
and alpha_node.directive == "texture"
and alpha_node.output_type == "float"
):
if alpha_node.path not in scene_state.shading_nodes:
wrangle_shading_network(alpha_node.path, saved_nodes=set())
else:
# If the passed in alpha_texture wasn't valid, clear it so we don't add
# it to the geometry
if alpha_tex:
api.Comment("%s is an invalid float texture" % alpha_tex)
properties[prop].Value[0] = ""
if properties["pbrt_include"].Value[0]:
# If we have included a file, skip output any geo.
api.Include(properties["pbrt_include"].Value[0])
return
soppath = properties["object:soppath"].Value[0]
if not soppath:
api.Comment("Can not find soppath for object")
return
Geo.output_geo(soppath, now, properties)
return
def wrangle_shading_network(
node_path,
name_prefix="",
name_suffix="",
use_named=True,
saved_nodes=None,
overrides=None,
root=True,
):
if node_path in scene_state.invalid_shading_nodes:
return
# Depth first, as textures/materials need to be
# defined before they are referenced
# Use this to track if a node has been output or not.
# if the saved_nodes is None, we use the global scene_state
# otherwise we use the one passed in. This is useful for outputing
# named materials within a nested Attribute Block.
if saved_nodes is None:
saved_nodes = scene_state.shading_nodes
# NOTE: We prefix and suffix names here so that there are not collisions when
# using full point instancing. There is some possible redundancy as the same
# network maybe recreated multiple times under different names if the
# overrides are the same. A possible optimization for export and PBRT is to
# do a prepass and build the networks before and keep a map to the pre-built
# networks. For now we'll brute force it.
presufed_node_path = name_prefix + node_path + name_suffix
if presufed_node_path in saved_nodes:
return
hnode = hou.node(node_path)
# Material or Texture?
node = BaseNode.from_node(hnode)
if node is None:
api.Comment("Skipping %s since its not a Material or Texture node" % node_path)
scene_state.invalid_shading_nodes.add(node_path)
return
else:
saved_nodes.add(presufed_node_path)
node.path_suffix = name_suffix
node.path_prefix = name_prefix
if node.directive == "material":
api_call = api.MakeNamedMaterial if use_named else api.Material
elif node.directive == "texture":
api_call = api.Texture
else:
return
paramset = node.paramset_with_overrides(overrides)
for node_input in node.inputs():
wrangle_shading_network(
node_input,
name_prefix=name_prefix,
name_suffix=name_suffix,
use_named=use_named,
saved_nodes=saved_nodes,
overrides=overrides,
root=False,
)
coord_sys = node.coord_sys
if coord_sys:
api.TransformBegin()
api.Transform(coord_sys)
if api_call == api.Material:
api_call(node.directive_type, paramset)
else:
api_call(node.full_name, node.output_type, node.directive_type, paramset)
if coord_sys:
api.TransformEnd()
if api_call == api.MakeNamedMaterial:
print()
return
def wrangle_geo(obj, wrangler, now):
parm_selection = {
'object:soppath':
SohoPBRT('object:soppath', 'string', [''], skipdefault=False),
'ptinstance':
SohoPBRT('ptinstance', 'integer', [0], skipdefault=False),
# NOTE: In order for shop_materialpath to evaluate correctly when using (full) instancing
# shop_materialpath needs to be a 'shaderhandle' and not a 'string'
# NOTE: However this does not seem to apply to shop_materialpaths on the instance points
# and has to be done manually
'shop_materialpath':
SohoPBRT('shop_materialpath', 'shaderhandle', skipdefault=False),
'pbrt_rendersubd':
SohoPBRT('pbrt_rendersubd', 'bool', [False], False),
'pbrt_subdlevels':
SohoPBRT('pbrt_subdlevels', 'integer', [3], False, key='levels'),
'pbrt_computeN':
SohoPBRT('pbrt_computeN', 'bool', [True], False),
# The combination of None as a default as well as ignore defaults being False is
# important. 'None' implying the parm is missing and not available, and '' meaning
# a vacuum medium.
# We can't ignore defaults since a default might be the only way to set a medium
# back to a vacuum.
'pbrt_interior':
SohoPBRT('pbrt_interior', 'string', [None], False),
'pbrt_exterior':
SohoPBRT('pbrt_exterior', 'string', [None], False),
'pbrt_ignorevolumes':
SohoPBRT('pbrt_ignorevolumes', 'bool', [False], True),
'pbrt_ignorematerials':
SohoPBRT('pbrt_ignorematerials', 'bool', [False], True),
'pbrt_splitdepth':
SohoPBRT('pbrt_splitdepth', 'integer', [3], True, key='splitdepth'),
# We don't use the key=type since its a bit too generic of a name
'pbrt_curvetype':
SohoPBRT('pbrt_curvetype', 'string', ['flat'], True),
'pbrt_include':
SohoPBRT('pbrt_include', 'string', [''], False),
'pbrt_alpha_texture':
SohoPBRT('pbrt_alpha_texture',
'string', [''],
skipdefault=False,
key='alpha'),
'pbrt_shadowalpha_texture':
SohoPBRT('pbrt_shadowalpha_texture',
'string', [''],
skipdefault=False,
key='shadowalpha'),
# TODO, Tesselation options?
}
properties = obj.evaluate(parm_selection, now)
if 'shop_materialpath' not in properties:
shop = ''
else:
shop = properties['shop_materialpath'].Value[0]
# NOTE: Having to track down shop_materialpaths does not seem to be a requirement
# with Mantra or RenderMan. Either its because I'm missing some logic/initialization
# either in Soho or in the Shading HDAs. Or there is some hardcoding in the Houdini libs
# that know how to translate shop_materialpath point aassignments to shaders directly
# through a SohoParm. Until that is figured out, we'll have to do it manually.
pt_shop_found = False
if properties['ptinstance'].Value[0] == 1:
pt_shop_found = Instancing.process_full_pt_instance_material(obj, now)
# If we found a point shop, don't output the default one here.
if shop in scene_state.shading_nodes and not pt_shop_found:
api.NamedMaterial(shop)
interior = None
exterior = None
if 'pbrt_interior' in properties:
interior = properties['pbrt_interior'].Value[0]
if 'pbrt_exterior' in properties:
exterior = properties['pbrt_exterior'].Value[0]
# We only output a MediumInterface if one or both of the parms exist
if interior is not None or exterior is not None:
interior = '' if interior is None else interior
exterior = '' if exterior is None else exterior
api.MediumInterface(interior, exterior)
for prop in ('alpha', 'shadowalpha'):
alpha_tex = properties[prop].Value[0]
alpha_node = BaseNode.from_node(alpha_tex)
if (alpha_node and alpha_node.directive == 'texture'
and alpha_node.output_type == 'float'):
if alpha_node.path not in scene_state.shading_nodes:
wrangle_shading_network(alpha_node.path, saved_nodes=set())
else:
# If the passed in alpha_texture wasn't valid, clear it so we don't add
# it to the geometry
if alpha_tex:
api.Comment('%s is an invalid float texture' % alpha_tex)
properties[prop].Value[0] = ''
if properties['pbrt_include'].Value[0]:
# If we have included a file, skip output any geo.
api.Include(properties['pbrt_include'].Value[0])
return
soppath = properties['object:soppath'].Value[0]
if not soppath:
api.Comment('Can not find soppath for object')
return
Geo.output_geo(soppath, now, properties)
return
def wrangle_shading_network(node_path,
name_prefix='',
name_suffix='',
use_named=True,
saved_nodes=None,
overrides=None):
# Depth first, as textures/materials need to be
# defined before they are referenced
# Use this to track if a node has been output or not.
# if the saved_nodes is None, we use the global scene_state
# otherwise we use the one passed in. This is useful for outputing
# named materials within a nested Attribute Block.
if saved_nodes is None:
saved_nodes = scene_state.shading_nodes
# TODO: Currently (AFAICT) there isn't a case where prefixed and suffixed
# names are required. The original intent was to handling instancing
# variations, but given that fast instancing doesn't support material
# variations it has become moot. The workaround for full instancing is
# just to regenerate the shading network each time.
# Partitioning based on the different shading overrides might still make
# this useful but the current implementation doesn't need this.
presufed_node_path = name_prefix + node_path + name_suffix
if presufed_node_path in saved_nodes:
return
saved_nodes.add(presufed_node_path)
hnode = hou.node(node_path)
# Material or Texture?
node = BaseNode.from_node(hnode)
if node is None:
return
if node.directive == 'material':
api_call = api.MakeNamedMaterial if use_named else api.Material
elif node.directive == 'texture':
api_call = api.Texture
else:
return
for node_input in node.inputs():
wrangle_shading_network(node_input,
name_prefix=name_prefix,
name_suffix=name_suffix,
use_named=use_named,
saved_nodes=saved_nodes)
coord_sys = node.coord_sys
if coord_sys:
api.TransformBegin()
api.Transform(coord_sys)
if api_call == api.Material:
api_call(node.directive_type, node.paramset)
else:
api_call(presufed_node_path, node.output_type, node.directive_type,
node.paramset)
if coord_sys:
api.TransformEnd()
if api_call == api.MakeNamedMaterial:
print()
return
def smoke_prim_wrangler(prims,
paramset=None,
properties=None,
override_node=None):
"""Outputs a "heterogeneous" Medium and bounding Shape for the input geometry
The following attributes are checked for via medium_prim_paramset() -
(See pbrt_medium node for what each parm does)
pbrt_interior (prim), string
preset (prim), string
g (prim), float
scale (prim), float[3]
sigma_a (prim), float[3]
sigma_s (prim), float[3]
Args:
prims (list of hou.Prims): Input prims
paramset (ParamSet): Any base params to add to the shape. (Optional)
properties (dict): Dictionary of SohoParms (Optional)
Returns: None
"""
# NOTE: Overlapping heterogeneous volumes don't currently
# appear to be supported, although this may be an issue
# with the Medium interface order? Visually it appears one
# object is blocking the other.
# NOTE: Not all samplers support heterogeneous volumes. Determine which
# ones do, (and verify this is accurate).
if properties is None:
properties = {}
if "pbrt_ignorevolumes" in properties and properties[
"pbrt_ignorevolumes"].Value[0]:
api.Comment("Ignoring volumes because pbrt_ignorevolumes is enabled")
return
medium_paramset = ParamSet()
if "pbrt_interior" in properties:
interior = BaseNode.from_node(properties["pbrt_interior"].Value[0])
if interior is not None and interior.directive_type == "pbrt_medium":
medium_paramset |= interior.paramset
# These are special overrides that come from full point instancing.
# It allows "per point" medium values to be "stamped" out to volume prims.
interior_paramset = properties.get(".interior_overrides")
if interior_paramset is not None:
medium_paramset.update(interior_paramset)
medium_suffix = ""
instance_info = properties.get(".instance_info")
if instance_info is not None:
medium_suffix = ":%s[%i]" % (instance_info.source,
instance_info.number)
exterior = None
if "pbrt_exterior" in properties:
exterior = properties["pbrt_exterior"].Value[0]
exterior = "" if exterior is None else exterior
for prim in prims:
smoke_paramset = ParamSet()
medium_name = "%s[%i]%s" % (
properties["object:soppath"].Value[0],
prim.number(),
medium_suffix,
)
resolution = prim.resolution()
# TODO: Benchmark this vs other methods like fetching volumeSlices
voxeldata = array.array("f")
voxeldata.fromstring(prim.allVoxelsAsString())
smoke_paramset.add(PBRTParam("integer", "nx", resolution[0]))
smoke_paramset.add(PBRTParam("integer", "ny", resolution[1]))
smoke_paramset.add(PBRTParam("integer", "nz", resolution[2]))
smoke_paramset.add(PBRTParam("point", "p0", [-1, -1, -1]))
smoke_paramset.add(PBRTParam("point", "p1", [1, 1, 1]))
smoke_paramset.add(PBRTParam("float", "density", voxeldata))
medium_prim_overrides = medium_prim_paramset(prim, medium_paramset)
smoke_paramset.update(medium_prim_overrides)
smoke_paramset |= paramset
# By default we'll set a sigma_a and sigma_s to be more Houdini-like
# however the object's pbrt_interior, or prim's pbrt_interior
# or prim attribs will override these.
if (PBRTParam("color", "sigma_a") not in smoke_paramset and PBRTParam(
"color", "sigma_s") not in smoke_paramset) and PBRTParam(
"string", "preset") not in smoke_paramset:
smoke_paramset.add(PBRTParam("color", "sigma_a", [1, 1, 1]))
smoke_paramset.add(PBRTParam("color", "sigma_s", [1, 1, 1]))
with api.AttributeBlock():
xform = prim_transform(prim)
api.ConcatTransform(xform)
api.MakeNamedMedium(medium_name, "heterogeneous", smoke_paramset)
api.Material("none")
api.MediumInterface(medium_name, exterior)
# Pad this slightly?
bounds_to_api_box([-1, 1, -1, 1, -1, 1])
return
def smoke_prim_wrangler(prims, paramset=None, properties=None):
"""Outputs a "heterogeneous" Medium and bounding Shape for the input geometry
The following attributes are checked for via medium_prim_paramset() -
(See pbrt_medium node for what each parm does)
pbrt_interior (prim), string
preset (prim), string
g (prim), float
scale (prim), float[3]
sigma_a (prim), float[3]
sigma_s (prim), float[3]
Args:
prims (list of hou.Prims): Input prims
paramset (ParamSet): Any base params to add to the shape. (Optional)
properties (dict): Dictionary of SohoParms (Optional)
Returns: None
"""
# NOTE: Overlapping heterogeneous volumes don't currently
# appear to be supported, although this may be an issue
# with the Medium interface order? Visually it appears one
# object is blocking the other.
# NOTE: Not all samplers support heterogeneous volumes. Determine which
# ones do, (and verify this is accurate).
if properties is None:
properties = {}
if ('pbrt_ignorevolumes' in properties
and properties['pbrt_ignorevolumes'].Value[0]):
api.Comment('Ignoring volumes because pbrt_ignorevolumes is enabled')
return
medium_paramset = ParamSet()
if 'pbrt_interior' in properties:
interior = BaseNode.from_node(properties['pbrt_interior'].Value[0])
if interior is not None and interior.directive_type == 'pbrt_medium':
medium_paramset |= interior.paramset
exterior = None
if 'pbrt_exterior' in properties:
exterior = properties['pbrt_exterior'].Value[0]
exterior = '' if exterior is None else exterior
for prim in prims:
smoke_paramset = ParamSet()
name = '%s[%i]' % (properties['object:soppath'].Value[0],
prim.number())
resolution = prim.resolution()
# TODO: Benchmark this vs other methods like fetching volumeSlices
voxeldata = array.array('f')
voxeldata.fromstring(prim.allVoxelsAsString())
smoke_paramset.add(PBRTParam('integer', 'nx', resolution[0]))
smoke_paramset.add(PBRTParam('integer', 'ny', resolution[1]))
smoke_paramset.add(PBRTParam('integer', 'nz', resolution[2]))
smoke_paramset.add(PBRTParam('point', 'p0', [-1, -1, -1]))
smoke_paramset.add(PBRTParam('point', 'p1', [1, 1, 1]))
smoke_paramset.add(PBRTParam('float', 'density', voxeldata))
medium_prim_overrides = medium_prim_paramset(prim, medium_paramset)
smoke_paramset.update(medium_prim_overrides)
smoke_paramset |= paramset
# By default we'll set a sigma_a and sigma_s to be more Houdini-like
# however the object's pbrt_interior, or prim's pbrt_interior
# or prim attribs will override these.
if ((PBRTParam('color', 'sigma_a') not in smoke_paramset
and PBRTParam('color', 'sigma_s') not in smoke_paramset)
and PBRTParam('string', 'preset') not in smoke_paramset):
smoke_paramset.add(PBRTParam('color', 'sigma_a', [1, 1, 1]))
smoke_paramset.add(PBRTParam('color', 'sigma_s', [1, 1, 1]))
with api.AttributeBlock():
xform = prim_transform(prim)
api.ConcatTransform(xform)
api.MakeNamedMedium(name, 'heterogeneous', smoke_paramset)
api.Material('none')
api.MediumInterface(name, exterior)
# Pad this slightly?
bounds_to_api_box([-1, 1, -1, 1, -1, 1])
return
