Lifting Freehand Concept Sketches into 3D

This example aims to visualize the 3D freehand sketches generated from the paper "Lifting Freehand Concept Sketches into 3D".

Data

The data used for this example comes from the officially released reconstruction results.

Code

#!/usr/bin/env python

import hakowan as hkw
import lagrange
import math
import numpy as np
import pathlib


def draw(filename: pathlib.Path, config, rotate_angle):
    sketch = lagrange.SurfaceMesh()

    with open(filename, "r") as fin:
        for line in fin:
            if line.startswith("v "):
                fields = line.split()
                v = [float(x) for x in fields[1:]]
                sketch.add_vertex(v)
            elif line.startswith("l "):
                fields = line.split()
                l = np.array([int(x) - 1 for x in fields[1:]])
                sketch.add_polygon(l)

    base = (
        hkw.layer(sketch)
        .mark(hkw.mark.Curve)
        .channel(size=0.0005)
        .rotate([0, 1, 0], rotate_angle)
    )

    dark_line = base.channel(material=hkw.material.Plastic("#0C0609"))
    light_line = base.channel(material=hkw.material.Plastic("#CCCDD6"))

    stem = filename.stem
    dark_output_filename = pathlib.Path("results") / f"{stem}_dark.png"
    light_output_filename = pathlib.Path("results") / f"{stem}_light.png"

    hkw.render(dark_line, config, filename=dark_output_filename)
    hkw.render(light_line, config, filename=light_output_filename)


config = hkw.config()
config.z_up()
config.sensor.location = [1.5, -1.5, 1.5]
draw(pathlib.Path("data/Prof2task2_guitar_01_rough.obj"), config, 0)

config.y_up()
config.sensor.location = [1.75, 1.75, 1.75]
draw(pathlib.Path("data/designer2_guitar_01_rough.obj"), config, math.pi)