Compare Decimation Methods

This example compares various decimation methods

import time

import pyvista as pv
from pyvista import examples

import fast_simplification

# load an example mesh
mesh = examples.download_louis_louvre()

# nice camera angle
cpos = [
    (6.264157141857314, -6.959267635766402, 11.71668951132694),
    (1.3291685457683413, 2.267162128740896, 12.263240938610595),
    (0.0023825740958850136, -0.05786378450796799, 0.9983216444528751),
]

Compare decimation times

reduction = 0.9
print("Approach                         Time Elapsed")

tstart = time.time()
fas_sim = fast_simplification.simplify_mesh(mesh, target_reduction=reduction)
fast_sim_time = time.time() - tstart
print(f"Fast Quadratic Simplification  {fast_sim_time:8.4f} seconds")

tstart = time.time()
dec_std = mesh.decimate(reduction)
dec_std_time = time.time() - tstart
print(f"vtkQuadricDecimation           {dec_std_time:8.4f} seconds")

tstart = time.time()
dec_pro = mesh.decimate_pro(reduction)
dec_pro_time = time.time() - tstart
print(f"vtkDecimatePro                 {dec_pro_time:8.4f} seconds")


pl = pv.Plotter(shape=(2, 2), window_size=(1000, 1000), theme=pv.themes.DocumentTheme())
pl.add_text("Original", "upper_right", color="k")
pl.add_mesh(mesh, show_edges=True)
pl.camera_position = cpos

pl.subplot(0, 1)
pl.add_text(
    f"Fast-Quadric-Mesh-Simplification\n{fast_sim_time:8.4f} seconds",
    "upper_right",
    color="k",
)
pl.add_mesh(fas_sim, show_edges=True)
pl.camera_position = cpos

pl.subplot(1, 0)
pl.add_mesh(dec_std, show_edges=True)
pl.add_text(f"vtkQuadricDecimation\n{dec_std_time:8.4f} seconds", "upper_right", color="k")
pl.camera_position = cpos

pl.subplot(1, 1)
pl.add_mesh(dec_pro, show_edges=True)
pl.add_text(f"vtkDecimatePro\n{dec_pro_time:8.4f} seconds", "upper_right", color="k")
pl.camera_position = cpos

pl.show()

Approach                         Time Elapsed
Fast Quadratic Simplification    0.5010 seconds
vtkQuadricDecimation             2.4565 seconds
vtkDecimatePro                   1.9173 seconds