import itertools
import bpy
-
-class VertexCache:
- def __init__(self, size):
- self.size = size
- self.slots = [-1]*self.size
-
- def fetch(self, v):
- hit = v.index in self.slots
- if hit:
- self.slots.remove(v.index)
- self.slots.append(v.index)
- if not hit:
- del self.slots[0]
- return hit
-
- def fetch_strip(self, strip):
- hits = 0
- for v in strip:
- if self.fetch(v):
- hits += 1
- return hits
-
- def test_strip(self, strip):
- hits = 0
- for i in range(len(strip)):
- if i>=self.size:
- break
- if strip[i].index in self.slots[i:]:
- hits += 1
- return hits
-
+import mathutils
class MeshExporter:
def __init__(self):
+ self.show_progress = True
self.use_strips = True
self.use_degen_tris = False
- self.max_strip_len = 1024
- self.optimize_cache = True
- self.cache_size = 64
- self.export_lines = False
- self.export_uv = "UNIT0"
- self.tbn_vecs = False
- self.tbn_uvtex = ""
- self.compound = False
- self.material_tex = False
- self.smoothing = "MSPGL"
- self.export_groups = False
- self.max_groups = 2
-
- def stripify(self, mesh, progress = None):
- for f in mesh.faces:
- f.flag = False
-
- faces_done = 0
- strips = []
- loose = []
-
- cache = None
- if self.optimize_cache:
- cache = VertexCache(self.cache_size)
-
- island = []
- island_strips = []
- while 1:
- if not island:
- # No current island; find any unused face to start from
- queue = []
- for f in mesh.faces:
- if not f.flag:
- f.flag = True
- queue.append(f)
- break
-
- if not queue:
- break
-
- # Find all faces connected to the first one
- while queue:
- face = queue.pop(0)
- island.append(face)
-
- for n in f.get_neighbors():
- if not n.flag:
- n.flag = True
- queue.append(n)
-
- # Unflag the island for the next phase
- for f in island:
- f.flag = False
-
- # Find an unused face with as few unused neighbors as possible, but
- # at least one. This heuristic gives a preference to faces in corners
- # or along borders of a non-closed island.
- best = 5
- face = None
- for f in island:
- if f.flag:
- continue
-
- score = sum(not n.flag for n in f.get_neighbors())
- if score>0 and score<best:
- face = f
- best = score
-
- if face:
- # Create a strip starting from the face. This will flag the faces.
- strip = mesh.create_strip(face, self.max_strip_len)
- if strip:
- island_strips.append(strip)
- else:
- face.flag = True
- else:
- # Couldn't find a candidate face for starting a strip, so we're
- # done with this island
- while island_strips:
- best = 0
- if cache:
- # Find the strip that benefits the most from the current
- # contents of the vertex cache
- best_hits = 0
- for i in range(len(island_strips)):
- hits = cache.test_strip(island_strips[i])
- if hits>best_hits:
- best = i
- best_hits = hits
-
- strip = island_strips.pop(best)
- strips.append(strip)
-
- if cache:
- cache.fetch_strip(strip)
-
- faces_done += len(island)
- if progress:
- progress.set_progress(float(faces_done)/len(mesh.faces))
-
- # Collect any faces that weren't used in strips
- loose += [f for f in island if not f.flag]
- for f in island:
- f.flag = True
-
- island = []
- island_strips = []
-
- if cache:
- cache = VertexCache(self.cache_size)
- total_hits = 0
-
- if self.use_degen_tris and strips:
- big_strip = []
-
- for s in strips:
- if big_strip:
- # Generate glue elements, ensuring that the next strip begins at
- # an even position
- glue = [big_strip[-1], s[0]]
- if len(big_strip)%2:
- glue += [s[0]]
-
- big_strip += glue
- if cache:
- total_hits += cache.fetch_strip(glue)
- big_strip += s
- if cache:
- total_hits += cache.fetch_strip(s)
+ def join_strips(self, strips):
+ big_strip = []
- for f in loose:
- # Add loose faces to the end. This wastes space, using five
- # elements per triangle and six elements per quad.
+ for s in strips:
+ if big_strip:
+ # Generate glue elements, ensuring that the next strip begins at
+ # an even position
+ glue = [big_strip[-1], s[0]]
if len(big_strip)%2:
- order = (-1, -2, 0, 1)
- else:
- order = (0, 1, -1, -2)
- vertices = [f.vertices[i] for i in order[:len(f.vertices)]]
-
- if big_strip:
- glue = [big_strip[-1], vertices[0]]
- big_strip += glue
- if cache:
- total_hits += cache.fetch_strip(glue)
-
- big_strip += vertices
- if cache:
- total_hits += cache.fetch_strip(vertices)
+ glue += [s[0]]
- strips = [big_strip]
- loose = []
+ big_strip += glue
- return strips, loose
+ big_strip += s
- def export(self, context, out_file, objs=None):
- if self.compound:
- if objs is None:
- objs = context.selected_objects
- check = objs
- while check:
- children = []
- for o in check:
- for c in o.children:
- if c.compound:
- children.append(c)
- objs += children
- check = children
- elif objs is None:
- objs = [context.active_object]
+ return big_strip
- if not objs:
- raise Exception("Nothing to export")
- for o in objs:
- if o.type!="MESH":
- raise Exception("Can only export Mesh data")
+ def export_to_file(self, context, out_fn):
+ obj = context.active_object
- from .mesh import Mesh
from .util import Progress
- progress = Progress(context)
- progress.set_task("Preparing", 0.0, 0.0)
-
- mesh = None
- bmeshes = []
- for o in objs:
- bmesh = o.to_mesh(context.scene, True, "PREVIEW")
- bmeshes.append(bmesh)
- if not mesh:
- mesh = Mesh(bmesh)
- else:
- mesh.splice(Mesh(bmesh))
-
- progress.set_task("Smoothing", 0.05, 0.35)
- if self.smoothing=="NONE":
- mesh.flatten_faces()
- mesh.split_smooth(progress)
-
- if self.smoothing!="BLENDER":
- mesh.compute_normals()
-
- if self.export_groups:
- mesh.sort_vertex_groups(self.max_groups)
-
- # Create a mapping from vertex group indices to bone indices
- group_index_map = dict((i, i) for i in range(len(objs[0].vertex_groups)))
- if objs[0].parent and objs[0].parent.type=="ARMATURE":
- armature = objs[0].parent.data
- bone_indices = dict((armature.bones[i].name, i) for i in range(len(armature.bones)))
- for g in objs[0].vertex_groups:
- if g.name in bone_indices:
- group_index_map[g.index] = bone_indices[g.name]
-
- if self.material_tex and mesh.materials:
- mesh.generate_material_uv()
-
- texunits = []
- force_unit0 = False
- if mesh.uv_layers and (self.export_uv!="NONE" or self.material_tex):
- # Figure out which UV layers to export
- if self.export_uv=="ALL":
- texunits = range(len(mesh.uv_layers))
- elif self.material_tex:
- # The material UV layer is always the last one
- texunits = [len(mesh.uv_layers)-1]
- force_unit0 = True
- else:
- for i, u in enumerate(mesh.uv_layers):
- if u.unit==0:
- texunits = [i]
- break
- texunits = [(i, mesh.uv_layers[i]) for i in texunits]
- texunits = [u for u in texunits if not u[1].hidden]
-
- if self.tbn_vecs:
- # TBN coordinates must be generated before vertices are split by any other layer
- uv_names = [u.name for i, u in texunits]
- if self.tbn_uvtex in uv_names:
- tbn_index = uv_names.index(self.tbn_uvtex)
- unit = texunits[tbn_index]
- del texunits[tbn_index]
- texunits.insert(0, unit)
-
- for i, u in texunits:
- progress.set_task("Splitting UVs", 0.35+0.3*i/len(texunits), 0.35+0.3*(i+1)/len(texunits))
- mesh.split_uv(i, progress)
- if self.tbn_vecs and u.name==self.tbn_uvtex:
- mesh.compute_uv()
- mesh.compute_tbn(i)
-
- mesh.compute_uv()
-
- strips = []
- loose = mesh.faces
- if self.use_strips:
- progress.set_task("Creating strips", 0.65, 0.95)
- strips, loose = self.stripify(mesh, progress)
-
- progress.set_task("Writing file", 0.95, 1.0)
-
- from .outfile import open_output
- out_file = open_output(out_file)
-
- fmt = ["NORMAL3"]
- if texunits:
- for i, u in texunits:
- if u.unit==0 or force_unit0:
- fmt.append("TEXCOORD2")
+ progress = Progress(self.show_progress and context)
+ progress.push_task("", 0.0, 0.95)
+ resource = self.export_mesh(context, obj, progress)
+
+ with open(out_fn, "w") as out_file:
+ for s in resource.statements:
+ s.write_to_file(out_file)
+
+ def export_mesh(self, context, mesh_or_obj, progress):
+ from .mesh import Mesh, create_mesh_from_object
+
+ if type(mesh_or_obj)==Mesh:
+ mesh = mesh_or_obj
+ else:
+ progress.push_task("", 0.0, 0.9)
+ mesh = create_mesh_from_object(context, mesh_or_obj, progress)
+ progress.pop_task()
+
+ from .datafile import Resource, Statement, Token
+ resource = Resource(mesh.name+".mesh")
+ statements = resource.statements
+
+ st = Statement("vertices", Token("NORMAL3"))
+ if mesh.uv_layers:
+ for u in mesh.uv_layers:
+ size = str(len(u.uvs[0]))
+ if u.unit==0:
+ st.append(Token("TEXCOORD"+size))
else:
- fmt.append("TEXCOORD2_%d"%u.unit)
- if self.tbn_vecs:
- fmt += ["TANGENT3", "BINORMAL3"]
- if self.export_groups:
- fmt.append("ATTRIB%d_5"%(self.max_groups*2))
- fmt.append("VERTEX3")
- out_file.begin("vertices", *fmt)
+ st.append(Token("TEXCOORD{}_{}".format(size, u.unit)))
+ if mesh.tbn_vecs:
+ st.append(Token("TANGENT3"))
+ st.append(Token("BINORMAL3"))
+ if mesh.vertex_groups:
+ st.append(Token("ATTRIB{}_5".format(mesh.max_groups_per_vertex*2)))
+ st.append(Token("VERTEX3"))
+
normal = None
- uvs = {}
+ uvs = [None]*len(mesh.uv_layers)
tan = None
bino = None
group = None
for v in mesh.vertices:
if v.normal!=normal:
- out_file.write("normal3", *v.normal)
+ st.sub.append(Statement("normal", *v.normal))
normal = v.normal
- for i, u in texunits:
- if v.uvs[i]!=uvs.get(i):
- if u.unit==0 or force_unit0:
- out_file.write("texcoord2", *v.uvs[i])
+ for i, u in enumerate(mesh.uv_layers):
+ if v.uvs[i]!=uvs[i]:
+ if u.unit==0:
+ st.sub.append(Statement("texcoord", *v.uvs[i]))
else:
- out_file.write("multitexcoord2", u.unit, *v.uvs[i])
+ st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
uvs[i] = v.uvs[i]
- if self.tbn_vecs:
+ if mesh.tbn_vecs:
if v.tan!=tan:
- out_file.write("tangent3", *v.tan)
+ st.sub.append(Statement("tangent", *v.tan))
tan = v.tan
if v.bino!=bino:
- out_file.write("binormal3", *v.bino)
+ st.sub.append(Statement("binormal", *v.bino))
bino = v.bino
- if self.export_groups:
- group_attr = [(group_index_map[g.group], g.weight*v.group_weight_scale) for g in v.groups[:self.max_groups]]
- while len(group_attr)<self.max_groups:
+ if mesh.vertex_groups:
+ group_attr = [(group_index_map[g.group], g.weight*v.group_weight_scale) for g in v.groups[:mesh.max_groups_per_vertex]]
+ while len(group_attr)<mesh.max_groups_per_vertex:
group_attr.append((0, 0.0))
group_attr = list(itertools.chain(*group_attr))
if group_attr!=group:
- out_file.write("attrib%d"%len(group_attr), 5, *group_attr)
+ st.sub.append(Statement("attrib", 5, *group_attr))
group = group_attr
- out_file.write("vertex3", *v.co)
- out_file.end()
- for s in strips:
- out_file.begin("batch", "TRIANGLE_STRIP")
- indices = []
- n = 0
- for v in s:
- indices.append(v.index)
- if len(indices)>=32:
- out_file.write("indices", *indices)
- indices = []
- if indices:
- out_file.write("indices", *indices)
- out_file.end()
+ st.sub.append(Statement("vertex", *v.co))
- if loose:
- out_file.begin("batch", "TRIANGLES")
- for f in loose:
- for i in range(2, len(f.vertices)):
- out_file.write("indices", f.vertices[0].index, f.vertices[i-1].index, f.vertices[i].index)
- out_file.end()
+ statements.append(st)
- if self.export_lines and mesh.lines:
- out_file.begin("batch", "LINES")
+ if self.use_strips:
+ strips = mesh.vertex_sequence
+ if self.use_degen_tris:
+ strips = [self.join_strips(strips)]
+
+ for s in strips:
+ st = Statement("batch", Token("TRIANGLE_STRIP"))
+ for i in range(0, len(s), 32):
+ st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
+ statements.append(st)
+ else:
+ st = Statement("batch", Token('TRIANGLES'))
+ for f in mesh.faces:
+ st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
+ statements.append(st)
+
+ if mesh.lines:
+ st = Statement("batch", Token('LINES'))
for l in mesh.lines:
- out_file.write("indices", l.vertices[0].index, l.vertices[1].index)
- out_file.end()
+ st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
+ statements.append(st)
- progress.set_task("Done", 1.0, 1.0)
+ if mesh.winding_test:
+ statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
- for m in bmeshes:
- bpy.data.meshes.remove(m)
+ progress.set_progress(1.0)
- return mesh
+ return resource
projects / libs / gl.git / blobdiff