Add feature: generate stil file to ply with camera direction.

data/.gitignore

@@ -1,2 +1,3 @@
 !.gitignore
-!sample/
+!samples/
+samples/stl2ply.ply

ply_processor_basics/stl/__init__.py

@@ -0,0 +1 @@
+from .stl2ply import stl2ply as stl2ply

ply_processor_basics/stl/stl2ply.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env /usr/bin/python3
+
+from typing import List
+
+import numpy as np
+import open3d as o3d
+
+
+def stl2ply(
+    name: str, cam_dir: List[float] = [-100.0, -100, 100], sample_points: int = 1000000, voxel_size: float = 1.0
+):
+    mesh = o3d.io.read_triangle_mesh(name + ".stl")
+    mesh.compute_vertex_normals()
+    pcd = mesh.sample_points_uniformly(number_of_points=sample_points)
+    pcdd = pcd.voxel_down_sample(voxel_size=voxel_size)
+
+    diameter = np.linalg.norm(np.asarray(pcdd.get_max_bound()) - np.asarray(pcdd.get_min_bound()))
+    camera = np.array(cam_dir)
+    radius = diameter * 100
+
+    _, pt_map = pcdd.hidden_point_removal(camera, radius)
+
+    pcd = pcdd.select_by_index(pt_map)
+
+    o3d.io.write_point_cloud(name + ".ply", pcd)

tests/stl/test_stl2ply.py

@@ -0,0 +1,10 @@
+import os
+
+from ply_processor_basics.stl import stl2ply
+
+
+def test_stl2ply_simple():
+    filename = "data/samples/stl2ply"
+    stl2ply(filename)
+    # ファイルがdata/test.plyに生成されている事を確認
+    assert os.path.exists(f"{filename}.ply")