Renderers

This test showcases rendering with various renderer approaches.

[1]:

%load_ext autoreload
%autoreload 2

[2]:

import lmenv
env = lmenv.load('.lmenv')

[3]:

import os
import pickle
import json
import numpy as np
import matplotlib.pyplot as plt
import lightmetrica as lm
%load_ext lightmetrica_jupyter
import lmscene

[4]:

lm.init()
lm.log.init('jupyter')
lm.progress.init('jupyter')
lm.info()
lm.comp.load_plugin(os.path.join(env.bin_path, 'accel_embree'))
if not lm.Release:
    lm.parallel.init('openmp', num_threads=1)
    lm.debug.attach_to_debugger()

[I|0.000] Lightmetrica -- Version 3.0.0 (rev. 70601db) Linux x64
[I|0.000] Loading plugin [name='accel_embree']
[I|0.001] .. Successfully loaded [name='accel_embree']

[5]:

def render(scene, name, **kwargs):
    w = 854
    h = 480
    film = lm.load_film('film', 'bitmap', w=w, h=h)
    renderer = lm.load_renderer('renderer', name,
        scene=scene,
        output=film,
        max_verts=10,
        scheduler='time',
        render_time=30,
        **kwargs)
    renderer.render()
    return np.copy(film.buffer())

def display_image(img, fig_size=15, scale=1):
    f = plt.figure(figsize=(fig_size,fig_size))
    ax = f.add_subplot(111)
    ax.imshow(np.clip(np.power(img*scale,1/2.2),0,1), origin='lower')
    ax.axis('off')
    plt.show()

Scene setup

[6]:

# Create scene
accel = lm.load_accel('accel', 'embree')
scene = lm.load_scene('scene', 'default', accel=accel)
lmscene.cornell_box_sphere(scene, env.scene_path)
scene.build()

[I|0.034] Loading asset [name='accel']
[I|0.035] .. {"intcost":1.0,"maxBranchingFactor":2,"maxDepth":18,"maxLeafSize":32,"minLeafSize":1,"quality":1,"sahBlockSize":1,"travcost":1.0}
[I|0.035] .. {"compact":false,"dynamic":false,"filter":false,"robust":false}
[I|0.035] Loading asset [name='scene']
[I|0.035] Loading asset [name='camera_main']
[I|0.035] Loading asset [name='model_obj']
[I|0.036] .. Loading OBJ file [path='CornellBox-Sphere.obj']
[I|0.036] .. Loading MTL file [path='CornellBox-Sphere.mtl']
[I|0.038] Building acceleration structure [name='accel']
[I|0.038] .. Flattening scene
[I|0.039] .. Building

Rendering

Path tracing (naive)

renderer::pt with sampling_mode = naive. For comparison, the primary rays are sampling from the entire image (primary_ray_sampling_mode = image).

[7]:

img = render(scene, 'pt',
    sampling_mode='naive',
    primary_ray_sampling_mode='image')
display_image(img)

[I|0.058] Loading asset [name='film']
[I|0.074] Loading asset [name='renderer']

../_images/executed_functest_func_renderers_10_2.png

Path tracing (next event estimation)

renderer::pt with sampling_mode = nee

[8]:

img = render(scene, 'pt',
    sampling_mode='nee',
    primary_ray_sampling_mode='image')
display_image(img)

[I|30.642] Loading asset [name='film']
[I|30.643] .. Asset [name='film'] has been already loaded. Replacing..
[I|30.659] Loading asset [name='renderer']
[I|30.659] .. Asset [name='renderer'] has been already loaded. Replacing..

../_images/executed_functest_func_renderers_12_2.png

Path tracing (multiple importance sampling)

renderer::pt with sampling_mode = mis

[9]:

img = render(scene, 'pt',
    sampling_mode='mis',
    primary_ray_sampling_mode='image')
display_image(img)

[I|61.301] Loading asset [name='film']
[I|61.301] .. Asset [name='film'] has been already loaded. Replacing..
[I|61.314] Loading asset [name='renderer']
[I|61.314] .. Asset [name='renderer'] has been already loaded. Replacing..

../_images/executed_functest_func_renderers_14_2.png

Light tracing

renderer::lt

[10]:

img = render(scene, 'lt')
display_image(img)

[I|92.069] Loading asset [name='film']
[I|92.069] .. Asset [name='film'] has been already loaded. Replacing..
[I|92.082] Loading asset [name='renderer']
[I|92.082] .. Asset [name='renderer'] has been already loaded. Replacing..

../_images/executed_functest_func_renderers_16_2.png

Bidirectional path tracing

renderer::bdpt (unoptimized, bad absolute performance)

[11]:

img = render(scene, 'bdpt')
display_image(img)

[I|122.794] Loading asset [name='film']
[I|122.794] .. Asset [name='film'] has been already loaded. Replacing..
[I|122.807] Loading asset [name='renderer']
[I|122.807] .. Asset [name='renderer'] has been already loaded. Replacing..

../_images/executed_functest_func_renderers_18_2.png

renderer::bdptopt (optimized)

[12]:

img = render(scene, 'bdptopt')
display_image(img)

[I|154.583] Loading asset [name='film']
[I|154.583] .. Asset [name='film'] has been already loaded. Replacing..
[I|154.596] Loading asset [name='renderer']
[I|154.596] .. Asset [name='renderer'] has been already loaded. Replacing..

../_images/executed_functest_func_renderers_20_2.png