318 lines
10 KiB
Python
318 lines
10 KiB
Python
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import bpy,bmesh,bpy_extras,mathutils
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import pathlib,zipfile,time,os,tempfile,math
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import struct,shutil
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from bpy_extras import node_shader_utils
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bm_current_version = 10
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def import_bm(context,filepath):
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# todo: finish this
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pass
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def export_bm(context,filepath,export_mode, export_target, no_component_suffix):
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# ============================================ alloc a temp folder
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tempFolderObj = tempfile.TemporaryDirectory()
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tempFolder = tempFolderObj.name
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# debug
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# tempFolder = "G:\\ziptest"
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tempTextureFolder = os.path.join(tempFolder, "Texture")
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os.makedirs(tempTextureFolder)
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# ============================================ find export target
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if export_mode== "COLLECTION":
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objectList = bpy.data.collections[export_target].objects
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else:
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objectList = [bpy.data.objects[export_target]]
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needSuffixChecker = no_component_suffix != ""
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componentObj = set()
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for obj in objectList:
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if needSuffixChecker and obj.name.endwith(no_component_suffix):
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pass # meshObjList.add(obj)
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else:
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if is_component(obj.name):
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componentObj.add(obj)
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else:
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pass # meshObjList.add(obj)
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# ============================================ export
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finfo = open(os.path.join(tempFolder, "index.bm"), "wb")
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finfo.write(struct.pack("I", bm_current_version))
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# ====================== export object
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fobject = open(os.path.join(tempFolder, "object.bm"), "wb")
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meshSet = set()
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meshList = []
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meshCount = 0
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for obj in objectList:
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# only export mesh object
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if obj.type != 'MESH':
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continue
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varis_component = obj in componentObj
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# clean no mesh object
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currentMesh = obj.data
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if currentMesh == None:
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continue
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# triangle first and then group
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if not varis_component:
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if currentMesh not in meshSet:
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mesh_triangulate(currentMesh)
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meshSet.add(currentMesh)
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meshList.append(currentMesh)
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meshId = meshCount
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meshCount += 1
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else:
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meshId = meshList.index(currentMesh)
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# write finfo first
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write_string(finfo, obj.name)
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write_int(finfo, info_bm_type.OBJECT)
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write_long(finfo, fobject.tell())
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# write fobject
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write_int(fobject, 1 if varis_component else 0)
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write_worldMatrix(fobject, obj.matrix_world)
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if varis_component:
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write_int(fobject, get_component_id(obj.name))
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else:
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write_int(fobject, meshId)
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fobject.close()
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# ====================== export mesh
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fmesh = open(os.path.join(tempFolder, "mesh.bm"), "wb")
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materialSet = set()
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materialList = []
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for mesh in meshList:
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mesh.calc_normals_split()
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# write finfo first
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write_string(finfo, mesh.name)
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write_int(finfo, info_bm_type.MESH)
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write_long(finfo, fmesh.tell())
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# write fmesh
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# vertices
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vecList = mesh.vertices[:]
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write_int(fmesh, len(vecList))
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for vec in vecList:
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#swap yz
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write_3vector(fmesh,vec.co[0],vec.co[2],vec.co[1])
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# uv
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face_index_pairs = [(face, index) for index, face in enumerate(mesh.polygons)]
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uv_layer = mesh.uv_layers.active.data[:]
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write_int(fmesh, len(face_index_pairs) * 3)
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for f, f_index in face_index_pairs:
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# it should be triangle face, otherwise throw a error
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if (f.loop_total != 3):
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raise Exception("Not a triangle", f.poly.loop_total)
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for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
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uv = uv_layer[loop_index].uv
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# reverse v
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write_2vector(fmesh, uv[0], -uv[1])
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# normals
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write_int(fmesh, len(face_index_pairs) * 3)
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for f, f_index in face_index_pairs:
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# no need to check triangle again
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for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
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nml = mesh.loops[loop_index].normal
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# swap yz
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write_3vector(fmesh, nml[0], nml[2], nml[1])
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# face
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# get material first
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currentMat = mesh.materials[:]
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noMaterial = len(currentMat) == 0
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for mat in currentMat:
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if mat not in materialSet:
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materialSet.add(mat)
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materialList.append(mat)
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write_int(fmesh, len(face_index_pairs))
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vtIndex = []
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vnIndex = []
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vIndex = []
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for f, f_index in face_index_pairs:
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# confirm material use
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if noMaterial:
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usedMat = 0
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else:
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usedMat = materialList.index(currentMat[f.material_index])
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# export face
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vtIndex.clear()
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vnIndex.clear()
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vIndex.clear()
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counter = 0
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for loop_index in range(f.loop_start, f.loop_start + f.loop_total):
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vIndex.append(mesh.loops[loop_index].vertex_index)
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vnIndex.append(f_index * 3 + counter)
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vtIndex.append(f_index * 3 + counter)
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counter += 1
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# reverse vertices sort
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write_face(fmesh,
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vIndex[2], vtIndex[2], vnIndex[2],
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vIndex[1], vtIndex[1], vnIndex[1],
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vIndex[0], vtIndex[0], vnIndex[0])
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# set used material
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write_int(fmesh, 0 if noMaterial else 1)
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write_int(fmesh, usedMat)
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mesh.free_normals_split()
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fmesh.close()
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# ====================== export material
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fmaterial = open(os.path.join(tempFolder, "material.bm"), "wb")
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textureSet = set()
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textureList = []
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textureCount = 0
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for material in materialList:
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# write finfo first
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write_string(finfo, material.name)
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write_int(finfo, info_bm_type.MATERIAL)
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write_long(finfo, fmaterial.tell())
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# write basic color
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mat_wrap = node_shader_utils.PrincipledBSDFWrapper(material)
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if mat_wrap:
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use_mirror = mat_wrap.metallic != 0.0
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if use_mirror:
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write_3vector(fmaterial, mat_wrap.metallic, mat_wrap.metallic, mat_wrap.metallic)
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else:
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write_3vector(fmaterial, 1, 1, 1)
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write_3vector(fmaterial, mat_wrap.base_color[0], mat_wrap.base_color[1], mat_wrap.base_color[2])
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write_3vector(fmaterial, mat_wrap.specular, mat_wrap.specular, mat_wrap.specular)
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# confirm texture
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tex_wrap = getattr(mat_wrap, "base_color_texture", None)
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if tex_wrap:
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image = tex_wrap.image
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if image:
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# add into texture list
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if image not in textureSet:
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textureSet.add(image)
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textureList.append(image)
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currentTexture = textureCount
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textureCount += 1
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else:
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currentTexture = textureList.index(image)
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write_int(fmaterial, 1)
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write_int(fmaterial, currentTexture)
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else:
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# no texture
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write_int(fmaterial, 0)
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write_int(fmaterial, 0)
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else:
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# no texture
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write_int(fmaterial, 0)
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write_int(fmaterial, 0)
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else:
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# no Principled BSDF. write garbage
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write_3vector(fmaterial, 0.8, 0.8, 0.8)
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write_3vector(fmaterial, 0.8, 0.8, 0.8)
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write_3vector(fmaterial, 0.8, 0.8, 0.8)
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write_int(fmaterial, 0)
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write_int(fmaterial, 0)
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fmaterial.close()
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# ====================== export texture
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ftexture = open(os.path.join(tempFolder, "texture.bm"), "wb")
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for texture in textureList:
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# write finfo first
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write_string(finfo, texture.name)
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write_int(finfo, info_bm_type.TEXTURE)
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write_long(finfo, ftexture.tell())
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# confirm internal
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filename = os.path.basename(texture.filepath)
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write_string(ftexture, filename)
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if (is_external_texture(filename)):
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write_int(ftexture, 1)
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else:
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# copy internal texture
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write_int(ftexture, 0)
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shutil.copy(texture.filepath, os.path.join(tempTextureFolder, filename))
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ftexture.close()
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# close info fs
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finfo.close()
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# ============================================ save zip and clean up folder
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if os.path.isfile(filepath):
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os.remove(filepath)
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with zipfile.ZipFile(filepath, 'w', zipfile.ZIP_DEFLATED, 9) as zipObj:
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for folderName, subfolders, filenames in os.walk(tempFolder):
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for filename in filenames:
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filePath = os.path.join(folderName, filename)
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arcname=os.path.relpath(filePath, tempFolder)
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zipObj.write(filePath, arcname)
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tempFolderObj.cleanup()
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# ======================================================================================= export / import assistant
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class info_bm_type():
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OBJECT = 0
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MESH = 1
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MATERIAL = 2
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TEXTURE = 3
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def is_component(name):
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return get_component_id(name) != -1
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def get_component_id(name):
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return -1 # todo: finish this, -1 mean not a component
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def is_external_texture(name):
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return False # todo: finish this. external mean no copy file
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def mesh_triangulate(me):
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bm = bmesh.new()
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bm.from_mesh(me)
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bmesh.ops.triangulate(bm, faces=bm.faces)
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bm.to_mesh(me)
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bm.free()
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# ======================================================================================= file io assistant
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def write_string(fs,str):
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count=len(str)
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write_int(fs,count)
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fs.write(str.encode("utf_32_le"))
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def write_int(fs,num):
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fs.write(struct.pack("I", num))
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def write_long(fs,num):
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fs.write(struct.pack("Q", num))
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def write_worldMatrix(fs, matt):
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mat = matt.transposed()
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fs.write(struct.pack("ffffffffffffffff",
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mat[0][0],mat[0][2], mat[0][1], mat[0][3],
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mat[2][0],mat[2][2], mat[2][1], mat[2][3],
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mat[1][0],mat[1][2], mat[1][1], mat[1][3],
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mat[3][0],mat[3][2], mat[3][1], mat[3][3]))
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def write_3vector(fs, x, y ,z):
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fs.write(struct.pack("fff", x, y ,z))
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def write_2vector(fs, u, v):
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fs.write(struct.pack("ff", u, v))
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def write_face(fs, v1, vn1, vt1, v2, vn2, vt2, v3, vn3, vt3):
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fs.write(struct.pack("IIIIIIIII", v1, vn1, vt1, v2, vn2, vt2, v3, vn3, vt3))
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