Layout Embedding

This example aims to provide an alternative visualization for the results from the paper Layout Embedding via Combinatorial Optimization.

Interactive demo

Data

The data used in this example was generated by the official released code:

./pig_figure

Input contract

• surface: surface from data/teaser_pig_bnb_target.obj; chart (facet 1-channel scalar).
• layout: layout from data/teaser_pig_bnb.lem; no pre-existing attributes required.

Reproduce and inspect

python ../render_gallery.py --check Layout
python ../render_gallery.py --artifacts Layout

Python · Manifest · Inspection · Canonical JSON · Validation

Code

#!/usr/bin/env python

import hakowan as hkw
from data import load_data
import math

hkw.set_default_backend("mitsuba")

# Step 1: Preprocess data.
ref_mesh, chains_mesh = load_data()

# Step 2: Generate layout layers.
base = hkw.layer().rotate([0, 1, 0], -math.pi / 2)

# Mesh layer contains the base geometry.
# Use chart attribute as scalar field texture.
mesh_layer = (
    base.data(ref_mesh)
    .name("Surface charts")
    .material(
        "Principled",
        color=hkw.texture.ScalarField(
            "chart",
            colormap="set1",
            categories=True,
            legend=hkw.Legend(title="Chart"),
        ),
        roughness=0.0,
        metallic=0.0,
    )
)

# Chain layer contains the layout boundaries.
chains_layer = (
    base.data(chains_mesh)
    .name("Chart boundaries")
    .mark("Curve")
    .material("Conductor", "Cr")
    .channel(size=0.02)
)

scene = hkw.SceneSettings(camera=hkw.PerspectiveCamera(eye=(0, 0, 3)))

# Step 3: Render both layers.
solid_view = mesh_layer + chains_layer
RECIPE_FIGURE = hkw.Figure(solid_view, scene)
RECIPE_INSPECTIONS = {"surface": ref_mesh, "layout": chains_mesh}
RECIPE_DATA_IDS = {id(ref_mesh): "surface", id(chains_mesh): "layout"}
RECIPE_DATA_RESOLVER = {"surface": ref_mesh, "layout": chains_mesh}
hkw.render(RECIPE_FIGURE, filename="results/pig_embedded.webp")

# Step 4: Render the mesh layer with glass material.
transparent_view = mesh_layer.material("ThinDielectric") + chains_layer
hkw.render(
    hkw.Figure(transparent_view, scene),
    filename="results/pig_embedded_glass.webp",
)

# Step 5: Interactive demo
hkw.render(
    hkw.Figure(solid_view | transparent_view, scene),
    backend="webgl",
    filename="results/pig_embedded.html",
)