splash page init, add obj2ply script

1 files changed, 79 insertions, 0 deletions

diff --git a/megapixels/commands/misc/obj2ply.py b/megapixels/commands/misc/obj2ply.py
new file mode 100644
index 00000000..e3e18e54
--- /dev/null
+++ b/megapixels/commands/misc/obj2ply.py
@@ -0,0 +1,79 @@
+#!/usr/bin/python
+
+"""
+Convert an OBJ 3D model (with vertex color) to a PLY file, which can be read by the draco_encoder.
+"""
+
+import click
+
+@click.command()
+@click.add_argument('--float_colors', action='store_true', help='pass if RGB colors are floats, not ints, in the obj')
+@click.add_argument('--unwind', action='store_true', help='pass to reverse winding order on faces (if surface normals are upside down)')
+@click.add_argument('--flip_y', action='store_true', help='flip Y axis')
+@click.add_argument('-i', '--input_fn', required=True, help='input OBJ filename')
+@click.add_argument('-o', '--output_fn', help='output PLY filename')
+@click.pass_context
+def cli(ctx, float_colors, unwind, flip_y, input_fn, output_fn):
+  """
+  click command for converting OBJ to PLY  
+  """
+
+  ply_header = """ply
+  format ascii 1.0
+  element vertex {}
+  property float x
+  property float y
+  property float z
+  property uchar red
+  property uchar green
+  property uchar blue
+  element face {}
+  property list uchar int vertex_index
+  end_header
+  """
+
+  if output_fn is None:
+    output_fn = input_fn.replace('.obj', '.ply')
+
+  with open(input_fn, 'r') as f:
+    i = 0
+    vertexes = []
+    faces = []
+    for line in f.readlines():
+      N = line.strip().split(' ')
+      if N[0] == 'v':
+        if flip_y:
+          N[2] = str(float(N[2]) * -1)
+        if float_colors:
+          vertexes.append([
+            N[1],
+            N[2],
+            N[3],
+            str(int(255 * float(N[4]))),
+            str(int(255 * float(N[5]))),
+            str(int(255 * float(N[6]))),
+          ])
+        else:
+          vertexes.append(N[1:])
+      if N[0] == 'f':
+        if unwind:
+          faces.append([
+            "3",
+            str(int(N[3]) - 1),
+            str(int(N[2]) - 1),
+            str(int(N[1]) - 1),
+          ])
+        else:
+          faces.append([
+            "3",
+            str(int(N[1]) - 1),
+            str(int(N[2]) - 1),
+            str(int(N[3]) - 1),
+          ])
+
+    with open(output_fn, 'w') as out_file:
+      out_file.write(ply_header.format(len(vertexes), len(faces)))
+      for v in vertexes:
+        out_file.write(" ".join(v) + "\n")
+      for f in faces:
+        out_file.write(" ".join(f) + "\n")