kopia lustrzana https://github.com/OpenDroneMap/ODM
310 wiersze
10 KiB
Python
310 wiersze
10 KiB
Python
import os
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import rasterio
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from rasterio.io import MemoryFile
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import warnings
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import numpy as np
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import pygltflib
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from opendm import system
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from opendm import io
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warnings.filterwarnings("ignore", category=rasterio.errors.NotGeoreferencedWarning)
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def load_obj(obj_path, _info=print):
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if not os.path.isfile(obj_path):
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raise IOError("Cannot open %s" % obj_path)
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obj_base_path = os.path.dirname(os.path.abspath(obj_path))
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obj = {
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'materials': {},
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}
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vertices = []
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uvs = []
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normals = []
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faces = {}
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current_material = "_"
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with open(obj_path) as f:
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_info("Loading %s" % obj_path)
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for line in f:
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if line.startswith("mtllib "):
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# Materials
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mtl_file = "".join(line.split()[1:]).strip()
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obj['materials'].update(load_mtl(mtl_file, obj_base_path, _info=_info))
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elif line.startswith("v "):
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# Vertices
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vertices.append(list(map(float, line.split()[1:4])))
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elif line.startswith("vt "):
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# UVs
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uvs.append(list(map(float, line.split()[1:3])))
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elif line.startswith("vn "):
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normals.append(list(map(float, line.split()[1:4])))
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elif line.startswith("usemtl "):
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mtl_name = "".join(line.split()[1:]).strip()
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if not mtl_name in obj['materials']:
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raise Exception("%s material is missing" % mtl_name)
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current_material = mtl_name
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elif line.startswith("f "):
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if current_material not in faces:
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faces[current_material] = []
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a,b,c = line.split()[1:]
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if a.count("/") == 2:
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av, at, an = map(int, a.split("/")[0:3])
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bv, bt, bn = map(int, b.split("/")[0:3])
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cv, ct, cn = map(int, c.split("/")[0:3])
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faces[current_material].append((av - 1, bv - 1, cv - 1, at - 1, bt - 1, ct - 1, an - 1, bn - 1, cn - 1))
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else:
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av, at = map(int, a.split("/")[0:2])
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bv, bt = map(int, b.split("/")[0:2])
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cv, ct = map(int, c.split("/")[0:2])
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faces[current_material].append((av - 1, bv - 1, cv - 1, at - 1, bt - 1, ct - 1))
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obj['vertices'] = np.array(vertices, dtype=np.float32)
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obj['uvs'] = np.array(uvs, dtype=np.float32)
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obj['normals'] = np.array(normals, dtype=np.float32)
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obj['faces'] = faces
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obj['materials'] = convert_materials_to_jpeg(obj['materials'])
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return obj
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def convert_materials_to_jpeg(materials):
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min_value = 0
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value_range = 0
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skip_conversion = False
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for mat in materials:
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image = materials[mat]
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# Stop here, assuming all other materials are also uint8
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if image.dtype == np.uint8:
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skip_conversion = True
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break
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# Find common min/range values
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try:
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data_range = np.iinfo(image.dtype)
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min_value = min(min_value, 0)
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value_range = max(value_range, float(data_range.max) - float(data_range.min))
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except ValueError:
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# For floats use the actual range of the image values
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min_value = min(min_value, float(image.min()))
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value_range = max(value_range, float(image.max()) - min_value)
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if value_range == 0:
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value_range = 255 # Should never happen
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for mat in materials:
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image = materials[mat]
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if not skip_conversion:
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image = image.astype(np.float32)
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image -= min_value
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image *= 255.0 / value_range
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np.around(image, out=image)
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image[image > 255] = 255
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image[image < 0] = 0
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image = image.astype(np.uint8)
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with MemoryFile() as memfile:
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bands, h, w = image.shape
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bands = min(3, bands)
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with memfile.open(driver='JPEG', jpeg_quality=90, count=bands, width=w, height=h, dtype=rasterio.dtypes.uint8) as dst:
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for b in range(1, min(3, bands) + 1):
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dst.write(image[b - 1], b)
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memfile.seek(0)
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materials[mat] = memfile.read()
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return materials
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def load_mtl(mtl_file, obj_base_path, _info=print):
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mtl_file = os.path.join(obj_base_path, mtl_file)
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if not os.path.isfile(mtl_file):
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raise IOError("Cannot open %s" % mtl_file)
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mats = {}
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current_mtl = ""
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with open(mtl_file) as f:
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for line in f:
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if line.startswith("newmtl "):
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current_mtl = "".join(line.split()[1:]).strip()
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elif line.startswith("map_Kd ") and current_mtl:
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map_kd_filename = "".join(line.split()[1:]).strip()
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map_kd = os.path.join(obj_base_path, map_kd_filename)
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if not os.path.isfile(map_kd):
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raise IOError("Cannot open %s" % map_kd)
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_info("Loading %s" % map_kd_filename)
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with rasterio.open(map_kd, 'r') as src:
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mats[current_mtl] = src.read()
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return mats
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def paddedBuffer(buf, boundary):
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r = len(buf) % boundary
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if r == 0:
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return buf
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pad = boundary - r
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return buf + b'\x00' * pad
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def obj2glb(input_obj, output_glb, rtc=(None, None), draco_compression=True, _info=print):
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_info("Converting %s --> %s" % (input_obj, output_glb))
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obj = load_obj(input_obj, _info=_info)
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vertices = obj['vertices']
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uvs = obj['uvs']
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# Flip Y
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uvs = (([0, 1] - (uvs * [0, 1])) + uvs * [1, 0]).astype(np.float32)
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normals = obj['normals']
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binary = b''
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accessors = []
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bufferViews = []
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primitives = []
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materials = []
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textures = []
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images = []
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bufOffset = 0
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def addBufferView(buf, target=None):
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nonlocal bufferViews, bufOffset
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bufferViews += [pygltflib.BufferView(
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buffer=0,
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byteOffset=bufOffset,
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byteLength=len(buf),
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target=target,
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)]
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bufOffset += len(buf)
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return len(bufferViews) - 1
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for material in obj['faces'].keys():
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faces = obj['faces'][material]
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faces = np.array(faces, dtype=np.uint32)
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prim_vertices = vertices[faces[:,0:3].flatten()]
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prim_uvs = uvs[faces[:,3:6].flatten()]
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if faces.shape[1] == 9:
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prim_normals = normals[faces[:,6:9].flatten()]
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normals_blob = prim_normals.tobytes()
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else:
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prim_normals = None
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normals_blob = None
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vertices_blob = prim_vertices.tobytes()
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uvs_blob = prim_uvs.tobytes()
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binary += vertices_blob + uvs_blob
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if normals_blob is not None:
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binary += normals_blob
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verticesBufferView = addBufferView(vertices_blob, pygltflib.ARRAY_BUFFER)
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uvsBufferView = addBufferView(uvs_blob, pygltflib.ARRAY_BUFFER)
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normalsBufferView = None
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if normals_blob is not None:
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normalsBufferView = addBufferView(normals_blob, pygltflib.ARRAY_BUFFER)
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accessors += [
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pygltflib.Accessor(
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bufferView=verticesBufferView,
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componentType=pygltflib.FLOAT,
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count=len(prim_vertices),
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type=pygltflib.VEC3,
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max=prim_vertices.max(axis=0).tolist(),
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min=prim_vertices.min(axis=0).tolist(),
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),
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pygltflib.Accessor(
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bufferView=uvsBufferView,
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componentType=pygltflib.FLOAT,
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count=len(prim_uvs),
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type=pygltflib.VEC2,
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max=prim_uvs.max(axis=0).tolist(),
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min=prim_uvs.min(axis=0).tolist(),
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),
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]
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if prim_normals is not None:
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accessors += [
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pygltflib.Accessor(
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bufferView=normalsBufferView,
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componentType=pygltflib.FLOAT,
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count=len(prim_normals),
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type=pygltflib.VEC3,
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max=prim_normals.max(axis=0).tolist(),
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min=prim_normals.min(axis=0).tolist(),
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)
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]
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primitives += [pygltflib.Primitive(
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attributes=pygltflib.Attributes(POSITION=verticesBufferView, TEXCOORD_0=uvsBufferView, NORMAL=normalsBufferView), material=len(primitives)
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)]
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for material in obj['faces'].keys():
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texture_blob = paddedBuffer(obj['materials'][material], 4)
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binary += texture_blob
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textureBufferView = addBufferView(texture_blob)
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images += [pygltflib.Image(bufferView=textureBufferView, mimeType="image/jpeg")]
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textures += [pygltflib.Texture(source=len(images) - 1, sampler=0)]
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mat = pygltflib.Material(pbrMetallicRoughness=pygltflib.PbrMetallicRoughness(baseColorTexture=pygltflib.TextureInfo(index=len(textures) - 1), metallicFactor=0, roughnessFactor=1),
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alphaMode=pygltflib.OPAQUE)
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mat.extensions = {
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'KHR_materials_unlit': {}
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}
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materials += [mat]
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gltf = pygltflib.GLTF2(
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scene=0,
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scenes=[pygltflib.Scene(nodes=[0])],
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nodes=[pygltflib.Node(mesh=0)],
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meshes=[pygltflib.Mesh(
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primitives=primitives
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)],
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materials=materials,
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textures=textures,
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samplers=[pygltflib.Sampler(magFilter=pygltflib.LINEAR, minFilter=pygltflib.LINEAR)],
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images=images,
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accessors=accessors,
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bufferViews=bufferViews,
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buffers=[pygltflib.Buffer(byteLength=len(binary))],
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)
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gltf.extensionsRequired = ['KHR_materials_unlit']
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gltf.extensionsUsed = ['KHR_materials_unlit']
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if rtc != (None, None) and len(rtc) >= 2:
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gltf.extensionsUsed.append('CESIUM_RTC')
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gltf.extensions = {
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'CESIUM_RTC': {
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'center': [float(rtc[0]), float(rtc[1]), 0.0]
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}
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}
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gltf.set_binary_blob(binary)
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_info("Writing...")
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gltf.save(output_glb)
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_info("Wrote %s" % output_glb)
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if draco_compression:
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_info("Compressing with draco")
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try:
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compressed_glb = io.related_file_path(output_glb, postfix="_compressed")
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system.run('draco_transcoder -i "{}" -o "{}" -qt 16 -qp 16'.format(output_glb, compressed_glb))
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if os.path.isfile(compressed_glb) and os.path.isfile(output_glb):
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os.remove(output_glb)
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os.rename(compressed_glb, output_glb)
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except Exception as e:
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log.ODM_WARNING("Cannot compress GLB with draco: %s" % str(e))
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