def test01_construct(variant_scalar_rgb):
from mitsuba.core.xml import load_string
from mitsuba.render import ImageBlock
im = ImageBlock([33, 12], 4)
assert im is not None
assert ek.all(im.offset() == 0)
im.set_offset([10, 20])
assert ek.all(im.offset() == [10, 20])
assert ek.all(im.size() == [33, 12])
assert im.warn_invalid()
assert im.border_size() == 0 # Since there's no reconstruction filter
assert im.channel_count() == 4
assert im.data() is not None
rfilter = load_string("""<rfilter version="2.0.0" type="gaussian">
<float name="stddev" value="15"/>
</rfilter>""")
im = ImageBlock([10, 11], 2, filter=rfilter, warn_invalid=False)
assert im.border_size() == rfilter.border_size()
assert im.channel_count() == 2
assert not im.warn_invalid()
im = ImageBlock([10, 11], 6)
assert im is not None
im.channel_count() == 6
def test02_put_image_block(variant_scalar_rgb):
from mitsuba.core.xml import load_string
from mitsuba.render import ImageBlock
rfilter = load_string("""<rfilter version="2.0.0" type="box"/>""")
# TODO: test with varying `offset` values
im = ImageBlock([10, 5], 4, filter=rfilter)
im.clear()
check_value(im, 0)
im2 = ImageBlock(im.size(), 4, filter=rfilter)
im2.clear()
ref = 3.14 * np.arange(im.height() * im.width() * im.channel_count()) \
.reshape(im.height(), im.width(), im.channel_count())
for x in range(im.height()):
for y in range(im.width()):
im2.put([y + 0.5, x + 0.5], ref[x, y, :])
check_value(im2, ref)
for i in range(5):
im.put(im2)
check_value(im, (i + 1) * ref)
def _render_helper(scene, spp=None, sensor_index=0):
"""
Internally used function: render the specified Mitsuba scene and return a
floating point array containing RGB values and AOVs, if applicable
"""
from mitsuba.core import (Float, UInt32, UInt64, Vector2f,
is_monochromatic, is_rgb, is_polarized)
from mitsuba.render import ImageBlock
sensor = scene.sensors()[sensor_index]
film = sensor.film()
sampler = sensor.sampler()
film_size = film.crop_size()
if spp is None:
spp = sampler.sample_count()
total_sample_count = ek.hprod(film_size) * spp
if sampler.wavefront_size() != total_sample_count:
sampler.seed(ek.arange(UInt64, total_sample_count))
pos = ek.arange(UInt32, total_sample_count)
pos //= spp
scale = Vector2f(1.0 / film_size[0], 1.0 / film_size[1])
pos = Vector2f(Float(pos % int(film_size[0])),
Float(pos // int(film_size[0])))
pos += sampler.next_2d()
rays, weights = sensor.sample_ray_differential(
time=0,
sample1=sampler.next_1d(),
sample2=pos * scale,
sample3=0
)
spec, mask, aovs = scene.integrator().sample(scene, sampler, rays)
spec *= weights
del mask
if is_polarized:
from mitsuba.core import depolarize
spec = depolarize(spec)
if is_monochromatic:
rgb = [spec[0]]
elif is_rgb:
rgb = spec
else:
from mitsuba.core import spectrum_to_xyz, xyz_to_srgb
xyz = spectrum_to_xyz(spec, rays.wavelengths)
rgb = xyz_to_srgb(xyz)
del xyz
aovs.insert(0, Float(1.0))
for i in range(len(rgb)):
aovs.insert(i + 1, rgb[i])
del rgb, spec, weights, rays
block = ImageBlock(
size=film.crop_size(),
channel_count=len(aovs),
filter=film.reconstruction_filter(),
warn_negative=False,
warn_invalid=False,
border=False
)
block.clear()
block.put(pos, aovs)
del pos
del aovs
data = block.data()
ch = block.channel_count()
i = UInt32.arange(ek.hprod(block.size()) * (ch - 1))
weight_idx = i // (ch - 1) * ch
values_idx = (i * ch) // (ch - 1) + 1
weight = ek.gather(data, weight_idx)
values = ek.gather(data, values_idx)
return values / (weight + 1e-8)