class Material:
def __init__(self):
path = os.path.dirname(__file__)
path = os.path.join(path, 'mat_shaders')
self._loader = Loader([path])
self._bsdf_shader = None
self._sampling_shader = None
self._shader_name = None
def is_emissive(self):
if self._shader_name is None:
return False
return self._loader.exist(self._shader_name, 'emission.py')
def _func_args(self, spectrum):
func_args = [
StructArgPtr('hitpoint', HitPoint.factory()),
StructArgPtr('shadepoint', ShadePoint.factory(spectrum))
]
return func_args
def _load_args(self):
args = []
text = self._loader.load(self._shader_name, 'props.txt')
if text is not None:
args = parse_args(text,
self._color_mgr,
image_factory=self._image_factory)
return args
def load(self, shader_name, color_mgr, image_factory=None):
self._color_mgr = color_mgr
self._shader_name = shader_name
self._image_factory = image_factory
code = self._loader.load(shader_name, 'bsdf.py')
if code is None:
raise ValueError("bsdf.py in %s doesnt exist!" % shader_name)
args = self._load_args()
name = 'material_%i' % id(args)
s = color_mgr.zero()
func_args = self._func_args(s)
self._bsdf_shader = Shader(code=code,
args=args,
name=name,
func_args=func_args,
is_func=True)
#Sampling shader
code = self._loader.load(self._shader_name, 'sample.py')
if code is None:
code = self._default_sampling()
args = self._load_args()
ptr_mat_bsdf = PointerArg('ptr_mat_bsdf', 0)
ptr_mat_pdf = PointerArg('ptr_mat_pdf', 0)
ptr_bsdf = ArgList('ptr_mat_bsdf', [ptr_mat_bsdf])
ptr_pdf = ArgList('ptr_mat_pdf', [ptr_mat_pdf])
args.append(ptr_bsdf)
args.append(ptr_pdf)
name = 'material_sampling_%i' % id(args)
func_args = self._func_args(s)
self._sampling_shader = Shader(code=code,
args=args,
name=name,
func_args=func_args,
is_func=True)
#material pdf
code = self._loader.load(self._shader_name, 'pdf.py')
if code is None:
code = self._default_pdf()
args = self._load_args()
name = 'material_pdf_%i' % id(args)
func_args = self._func_args(s)
self._pdf_shader = Shader(code=code,
args=args,
name=name,
func_args=func_args,
is_func=True)
def _default_sampling(self):
code = """
r1 = random()
r2 = random()
e = 1.0
phi = 2.0 * 3.14159 * r1
exponent = 1.0 / (e + 1.0)
cos_theta = pow(r2, exponent)
tmp = 1.0 - cos_theta * cos_theta
sin_theta = sqrt(tmp)
sin_phi = sin(phi)
cos_phi = cos(phi)
pu = sin_theta * cos_phi
pv = sin_theta * sin_phi
pw = cos_theta
w = hitpoint.normal
tv = (0.0034, 1.0, 0.0071)
v = cross(tv, w)
v = normalize(v)
u = cross(v, w)
ndir = u * pu + v * pv + w * pw
shadepoint.wi = normalize(ndir)
__material_pdf(hitpoint, shadepoint, ptr_mat_pdf)
__material_reflectance(hitpoint, shadepoint, ptr_mat_bsdf)
"""
return code
def _default_pdf(self):
code = """
shadepoint.pdf = dot(hitpoint.normal, shadepoint.wi) * 0.318309886
"""
return code
def compile(self, shaders=[]):
self._bsdf_shader.compile(shaders, color_mgr=self._color_mgr)
self._sampling_shader.compile(shaders, color_mgr=self._color_mgr)
self._pdf_shader.compile(shaders, color_mgr=self._color_mgr)
def prepare(self, runtimes):
self._bsdf_shader.prepare(runtimes)
self._pdf_shader.prepare(runtimes)
ptrs = self._bsdf_shader.get_ptrs()
args = [PointerArg('ptr_mat_bsdf', p) for p in ptrs]
ptr_bsdf = self._sampling_shader._get_arg('ptr_mat_bsdf')
ptr_bsdf.resize(args)
ptrs = self._pdf_shader.get_ptrs()
args = [PointerArg('ptr_mat_pdf', p) for p in ptrs]
ptr_pdf = self._sampling_shader._get_arg('ptr_mat_pdf')
ptr_pdf.resize(args)
self._sampling_shader.prepare(runtimes)
def emission_shader(self, shaders=[]):
args = self._load_args()
code = self._loader.load(self._shader_name, 'emission.py')
if code is None:
raise ValueError("emission.py in %s dont exist!" %
self._shader_name)
name = 'material_emission_%i' % id(args)
s = self._color_mgr.zero()
func_args = self._func_args(s)
emission_shader = Shader(code=code,
args=args,
name=name,
func_args=func_args,
is_func=True)
return emission_shader
def sync_shader_props(self, shader):
for arg in shader.args:
val = self.get_value(arg.name)
shader.set_value(arg.name, val)
def set_value(self, name, val):
if self._bsdf_shader is None:
raise ValueError("Material shader is not loaded!")
if isinstance(val, (RGBSpectrum, SampledSpectrum)):
val = self._color_mgr.convert_spectrum(val)
self._bsdf_shader.set_value(name, val)
self._sampling_shader.set_value(name, val)
self._pdf_shader.set_value(name, val)
def get_value(self, name):
if self._bsdf_shader is None:
raise ValueError("Material shader is not loaded!")
return self._bsdf_shader.get_value(name)
def output(self, name):
txt = 'Material\n'
txt += 'type = %s\n' % self._shader_name
txt += 'name = %s\n' % name
args = self._load_args()
for arg in args:
value = self.get_value(arg.name)
txt += output_arg(arg.name, value)
txt += 'End\n'
return txt
class Material:
def __init__(self):
path = os.path.dirname(__file__)
path = os.path.join(path, 'mat_shaders')
self._loader = Loader([path])
self._bsdf_shader = None
self._sampling_shader = None
self._shader_name = None
def is_emissive(self):
if self._shader_name is None:
return False
return self._loader.exist(self._shader_name, 'emission.py')
def _func_args(self, spectrum):
func_args = [StructArgPtr('hitpoint', HitPoint.factory()),
StructArgPtr('shadepoint', ShadePoint.factory(spectrum))]
return func_args
def _load_args(self):
args = []
text = self._loader.load(self._shader_name, 'props.txt')
if text is not None:
args = parse_args(text, self._color_mgr, image_factory=self._image_factory)
return args
def load(self, shader_name, color_mgr, image_factory=None):
self._color_mgr = color_mgr
self._shader_name = shader_name
self._image_factory = image_factory
code = self._loader.load(shader_name, 'bsdf.py')
if code is None:
raise ValueError("bsdf.py in %s doesnt exist!" % shader_name)
args = self._load_args()
name = 'material_%i' % id(args)
s = color_mgr.zero()
func_args = self._func_args(s)
self._bsdf_shader = Shader(code=code, args=args, name=name,
func_args=func_args, is_func=True)
#Sampling shader
code = self._loader.load(self._shader_name, 'sample.py')
if code is None:
code = self._default_sampling()
args = self._load_args()
ptr_mat_bsdf = PointerArg('ptr_mat_bsdf', 0)
ptr_mat_pdf = PointerArg('ptr_mat_pdf', 0)
ptr_bsdf = ArgList('ptr_mat_bsdf', [ptr_mat_bsdf])
ptr_pdf = ArgList('ptr_mat_pdf', [ptr_mat_pdf])
args.append(ptr_bsdf)
args.append(ptr_pdf)
name = 'material_sampling_%i' % id(args)
func_args = self._func_args(s)
self._sampling_shader = Shader(code=code, args=args, name=name,
func_args=func_args, is_func=True)
#material pdf
code = self._loader.load(self._shader_name, 'pdf.py')
if code is None:
code = self._default_pdf()
args = self._load_args()
name = 'material_pdf_%i' % id(args)
func_args = self._func_args(s)
self._pdf_shader = Shader(code=code, args=args, name=name,
func_args=func_args, is_func=True)
def _default_sampling(self):
code = """
r1 = random()
r2 = random()
e = 1.0
phi = 2.0 * 3.14159 * r1
exponent = 1.0 / (e + 1.0)
cos_theta = pow(r2, exponent)
tmp = 1.0 - cos_theta * cos_theta
sin_theta = sqrt(tmp)
sin_phi = sin(phi)
cos_phi = cos(phi)
pu = sin_theta * cos_phi
pv = sin_theta * sin_phi
pw = cos_theta
w = hitpoint.normal
tv = (0.0034, 1.0, 0.0071)
v = cross(tv, w)
v = normalize(v)
u = cross(v, w)
ndir = u * pu + v * pv + w * pw
shadepoint.wi = normalize(ndir)
__material_pdf(hitpoint, shadepoint, ptr_mat_pdf)
__material_reflectance(hitpoint, shadepoint, ptr_mat_bsdf)
"""
return code
def _default_pdf(self):
code = """
shadepoint.pdf = dot(hitpoint.normal, shadepoint.wi) * 0.318309886
"""
return code
def compile(self, shaders=[]):
self._bsdf_shader.compile(shaders, color_mgr=self._color_mgr)
self._sampling_shader.compile(shaders, color_mgr=self._color_mgr)
self._pdf_shader.compile(shaders, color_mgr=self._color_mgr)
def prepare(self, runtimes):
self._bsdf_shader.prepare(runtimes)
self._pdf_shader.prepare(runtimes)
ptrs = self._bsdf_shader.get_ptrs()
args = [PointerArg('ptr_mat_bsdf', p) for p in ptrs]
ptr_bsdf = self._sampling_shader._get_arg('ptr_mat_bsdf')
ptr_bsdf.resize(args)
ptrs = self._pdf_shader.get_ptrs()
args = [PointerArg('ptr_mat_pdf', p) for p in ptrs]
ptr_pdf = self._sampling_shader._get_arg('ptr_mat_pdf')
ptr_pdf.resize(args)
self._sampling_shader.prepare(runtimes)
def emission_shader(self, shaders=[]):
args = self._load_args()
code = self._loader.load(self._shader_name, 'emission.py')
if code is None:
raise ValueError("emission.py in %s dont exist!" % self._shader_name)
name = 'material_emission_%i' % id(args)
s = self._color_mgr.zero()
func_args = self._func_args(s)
emission_shader = Shader(code=code, args=args, name=name,
func_args=func_args, is_func=True)
return emission_shader
def sync_shader_props(self, shader):
for arg in shader.args:
val = self.get_value(arg.name)
shader.set_value(arg.name, val)
def set_value(self, name, val):
if self._bsdf_shader is None:
raise ValueError("Material shader is not loaded!")
if isinstance(val, (RGBSpectrum, SampledSpectrum)):
val = self._color_mgr.convert_spectrum(val)
self._bsdf_shader.set_value(name, val)
self._sampling_shader.set_value(name, val)
self._pdf_shader.set_value(name, val)
def get_value(self, name):
if self._bsdf_shader is None:
raise ValueError("Material shader is not loaded!")
return self._bsdf_shader.get_value(name)
def output(self, name):
txt = 'Material\n'
txt += 'type = %s\n' % self._shader_name
txt += 'name = %s\n' % name
args = self._load_args()
for arg in args:
value = self.get_value(arg.name)
txt += output_arg(arg.name, value)
txt += 'End\n'
return txt
