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Revert "PLY: refactor exporter" 

This reverts commit 7f4c2d5e48.

Issues with unit tests.
This commit is contained in:
Mikhail Rachinskiy 2022-01-04 23:17:02 +04:00
parent 3fc4640761
commit 4c7e2b5a9e
2 changed files with 109 additions and 51 deletions
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2
io_mesh_ply/__init__.py
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@ -20,7 +20,7 @@
bl_info = {
"name": "Stanford PLY format",
"author": "Bruce Merry, Campbell Barton, Bastien Montagne, Mikhail Rachinsky",
"author": "Bruce Merry, Campbell Barton", "Bastien Montagne"
"version": (2, 1, 0),
"blender": (2, 90, 0),
"location": "File > Import/Export",

158
io_mesh_ply/export_ply.py
View File

@ -23,17 +23,23 @@ This script exports Stanford PLY files from Blender. It supports normals,
colors, and texture coordinates per face or per vertex.
"""
import bpy
class _PLYface:
__slots__ = "verts", "sides"
def __init__(self, sides: int) -> None:
self.verts = []
self.sides = sides
def _write_binary(fw, ply_verts: list, ply_faces: list) -> None:
def _write_binary(fw, ply_verts: list, ply_faces: list[_PLYface], mesh_verts: list) -> None:
from struct import pack
# Vertex data
# ---------------------------
for v, normal, uv_coords, color in ply_verts:
fw(pack("<3f", *v.co))
for index, normal, uv_coords, color in ply_verts:
fw(pack("<3f", *mesh_verts[index].co))
if normal is not None:
fw(pack("<3f", *normal))
if uv_coords is not None:
@ -45,21 +51,20 @@ def _write_binary(fw, ply_verts: list, ply_faces: list) -> None:
# ---------------------------
for pf in ply_faces:
length = len(pf)
fw(pack(f"<B{length}I", length, *pf))
fw(pack(f"<B{pf.sides}I", pf.sides, *pf.verts))
def _write_ascii(fw, ply_verts: list, ply_faces: list) -> None:
def _write_ascii(fw, ply_verts: list, ply_faces: list[_PLYface], mesh_verts: list) -> None:
# Vertex data
# ---------------------------
for v, normal, uv_coords, color in ply_verts:
fw(b"%.6f %.6f %.6f" % v.co[:])
for index, normal, uv_coords, color in ply_verts:
fw(b"%.6f %.6f %.6f" % mesh_verts[index].co[:])
if normal is not None:
fw(b" %.6f %.6f %.6f" % normal[:])
fw(b" %.6f %.6f %.6f" % normal)
if uv_coords is not None:
fw(b" %.6f %.6f" % uv_coords[:])
fw(b" %.6f %.6f" % uv_coords)
if color is not None:
fw(b" %u %u %u %u" % color)
fw(b"\n")
@ -68,46 +73,94 @@ def _write_ascii(fw, ply_verts: list, ply_faces: list) -> None:
# ---------------------------
for pf in ply_faces:
fw(b"%d" % len(pf))
for index in pf:
fw(b"%d" % pf.sides)
for index in pf.verts:
fw(b" %d" % index)
fw(b"\n")
def save_mesh(filepath, bm, use_ascii, use_normals, use_uv, use_color):
uv_lay = bm.loops.layers.uv.active
col_lay = bm.loops.layers.color.active
def save_mesh(filepath, mesh, use_ascii, use_normals, use_uv_coords, use_colors):
import bpy
use_uv = use_uv and uv_lay is not None
use_color = use_color and col_lay is not None
uv = color = None
def rvec3d(v):
return round(v[0], 6), round(v[1], 6), round(v[2], 6)
ply_verts = [None for _ in range(len(bm.verts))]
def rvec2d(v):
return round(v[0], 6), round(v[1], 6)
if use_uv_coords and mesh.uv_layers:
active_uv_layer = mesh.uv_layers.active.data
else:
use_uv_coords = False
if use_colors and mesh.vertex_colors:
active_col_layer = mesh.vertex_colors.active.data
else:
use_colors = False
# in case
color = uvcoord = uvcoord_key = normal = normal_key = None
mesh_verts = mesh.vertices
# vdict = {} # (index, normal, uv) -> new index
vdict = [{} for _ in range(len(mesh_verts))]
ply_verts = []
ply_faces = []
vert_count = 0
for f in mesh.polygons:
if use_normals:
smooth = f.use_smooth
if not smooth:
normal = f.normal[:]
normal_key = rvec3d(normal)
if use_uv_coords:
uv = [
active_uv_layer[l].uv[:]
for l in range(f.loop_start, f.loop_start + f.loop_total)
]
if use_colors:
col = [
active_col_layer[l].color[:]
for l in range(f.loop_start, f.loop_start + f.loop_total)
]
pf = _PLYface(f.loop_total)
for i, vidx in enumerate(f.vertices):
v = mesh_verts[vidx]
if use_normals and smooth:
normal = v.normal[:]
normal_key = rvec3d(normal)
if use_uv_coords:
uvcoord = uv[i][0], uv[i][1]
uvcoord_key = rvec2d(uvcoord)
if use_colors:
color = col[i]
color = (
int(color[0] * 255.0),
int(color[1] * 255.0),
int(color[2] * 255.0),
int(color[3] * 255.0),
)
key = normal_key, uvcoord_key, color
vdict_local = vdict[vidx]
pf_vidx = vdict_local.get(key) # Will be None initially
if pf_vidx is None: # Same as vdict_local.has_key(key)
pf_vidx = vdict_local[key] = vert_count
ply_verts.append((vidx, normal, uvcoord, color))
vert_count += 1
pf.verts.append(pf_vidx)
for f in bm.faces:
pf = []
ply_faces.append(pf)
normal = None
if use_normals and not f.smooth:
normal = f.normal
for loop in f.loops:
v = loop.vert
pf.append(v.index)
if not v.tag:
if use_normals and normal is None:
normal = v.normal
if use_uv:
uv = loop[uv_lay].uv
if use_color:
color = tuple(int(x * 255.0) for x in loop[col_lay])
ply_verts[v.index] = (v, normal, uv, color)
v.tag = True
with open(filepath, "wb") as file:
fw = file.write
file_format = b"ascii" if use_ascii else b"binary_little_endian"
@ -131,12 +184,12 @@ def save_mesh(filepath, bm, use_ascii, use_normals, use_uv, use_color):
b"property float ny\n"
b"property float nz\n"
)
if use_uv:
if use_uv_coords:
fw(
b"property float s\n"
b"property float t\n"
)
if use_color:
if use_colors:
fw(
b"property uchar red\n"
b"property uchar green\n"
@ -144,7 +197,7 @@ def save_mesh(filepath, bm, use_ascii, use_normals, use_uv, use_color):
b"property uchar alpha\n"
)
fw(b"element face %d\n" % len(ply_faces))
fw(b"element face %d\n" % len(mesh.polygons))
fw(b"property list uchar uint vertex_indices\n")
fw(b"end_header\n")
@ -152,9 +205,9 @@ def save_mesh(filepath, bm, use_ascii, use_normals, use_uv, use_color):
# ---------------------------
if use_ascii:
_write_ascii(fw, ply_verts, ply_faces)
_write_ascii(fw, ply_verts, ply_faces, mesh_verts)
else:
_write_binary(fw, ply_verts, ply_faces)
_write_binary(fw, ply_verts, ply_faces, mesh_verts)
def save(
@ -169,6 +222,7 @@ def save(
global_matrix=None,
):
import time
import bpy
import bmesh
t = time.time()
@ -203,22 +257,26 @@ def save(
if (ngons := [f for f in bm.faces if len(f.verts) > 255]):
bmesh.ops.triangulate(bm, faces=ngons)
mesh = bpy.data.meshes.new("TMP PLY EXPORT")
bm.to_mesh(mesh)
bm.free()
if global_matrix is not None:
bm.transform(global_matrix)
mesh.transform(global_matrix)
if use_normals:
bm.normal_update()
mesh.calc_normals()
save_mesh(
filepath,
bm,
mesh,
use_ascii,
use_normals,
use_uv_coords,
use_colors,
)
bm.free()
bpy.data.meshes.remove(mesh)
t_delta = time.time() - t
print(f"Export completed {filepath!r} in {t_delta:.3f}")