blender/io_mspgl/export_mesh.py

   1 import itertools
   2 import bpy
   3 import mathutils
   4
   5 class MeshExporter:
   6         def __init__(self):
   7                 self.show_progress = True
   8                 self.use_strips = True
   9                 self.use_degen_tris = False
  10
  11         def join_strips(self, strips):
  12                 big_strip = []
  13
  14                 for s in strips:
  15                         if big_strip:
  16                                 # Generate glue elements, ensuring that the next strip begins at
  17                                 # an even position
  18                                 glue = [big_strip[-1], s[0]]
  19                                 if len(big_strip)%2:
  20                                         glue += [s[0]]
  21
  22                                 big_strip += glue
  23
  24                         big_strip += s
  25
  26                 return big_strip
  27
  28         def export_to_file(self, context, out_fn):
  29                 obj = context.active_object
  30
  31                 from .util import Progress
  32
  33                 progress = Progress(self.show_progress and context)
  34                 progress.push_task("", 0.0, 0.95)
  35                 statements = self.export_mesh(context, obj, progress)
  36
  37                 with open(out_fn, "w") as out_file:
  38                         for s in statements:
  39                                 s.write_to_file(out_file)
  40
  41         def export_mesh(self, context, mesh_or_obj, progress):
  42                 from .mesh import Mesh, create_mesh_from_object
  43
  44                 if type(mesh_or_obj)==Mesh:
  45                         mesh = mesh_or_obj
  46                 else:
  47                         progress.push_task("", 0.0, 0.9)
  48                         mesh = create_mesh_from_object(context, mesh_or_obj, progress)
  49                         progress.pop_task()
  50
  51                 from .datafile import Statement, Token
  52
  53                 statements = []
  54
  55                 st = Statement("vertices", Token("NORMAL3"))
  56                 if mesh.uv_layers:
  57                         for u in mesh.uv_layers:
  58                                 size = str(len(u.uvs[0]))
  59                                 if u.unit==0:
  60                                         st.append(Token("TEXCOORD"+size))
  61                                 else:
  62                                         st.append(Token("TEXCOORD{}_{}".format(size, u.unit)))
  63                         if mesh.tbn_vecs:
  64                                 st.append(Token("TANGENT3"))
  65                                 st.append(Token("BINORMAL3"))
  66                 if mesh.vertex_groups:
  67                         st.append(Token("ATTRIB{}_5".format(mesh.max_groups_per_vertex*2)))
  68                 st.append(Token("VERTEX3"))
  69
  70                 normal = None
  71                 uvs = [None]*len(mesh.uv_layers)
  72                 tan = None
  73                 bino = None
  74                 group = None
  75                 for v in mesh.vertices:
  76                         if v.normal!=normal:
  77                                 st.sub.append(Statement("normal", *v.normal))
  78                                 normal = v.normal
  79                         for i, u in enumerate(mesh.uv_layers):
  80                                 if v.uvs[i]!=uvs[i]:
  81                                         if u.unit==0:
  82                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
  83                                         else:
  84                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
  85                                         uvs[i] = v.uvs[i]
  86                         if mesh.tbn_vecs:
  87                                 if v.tan!=tan:
  88                                         st.sub.append(Statement("tangent", *v.tan))
  89                                         tan = v.tan
  90                                 if v.bino!=bino:
  91                                         st.sub.append(Statement("binormal", *v.bino))
  92                                         bino = v.bino
  93                         if mesh.vertex_groups:
  94                                 group_attr = [(group_index_map[g.group], g.weight*v.group_weight_scale) for g in v.groups[:mesh.max_groups_per_vertex]]
  95                                 while len(group_attr)<mesh.max_groups_per_vertex:
  96                                         group_attr.append((0, 0.0))
  97                                 group_attr = list(itertools.chain(*group_attr))
  98                                 if group_attr!=group:
  99                                         st.sub.append(Statement("attrib", 5, *group_attr))
 100                                         group = group_attr
 101                         st.sub.append(Statement("vertex", *v.co))
 102
 103                 statements.append(st)
 104
 105                 if self.use_strips:
 106                         strips = mesh.vertex_sequence
 107                         if self.use_degen_tris:
 108                                 strips = [self.join_strips(strips)]
 109
 110                         for s in strips:
 111                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
 112                                 for i in range(0, len(s), 32):
 113                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
 114                                 statements.append(st)
 115                 else:
 116                         st = Statement("batch", "TRIANGLES")
 117                         for f in mesh.faces:
 118                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 119                         statements.append(st)
 120
 121                 if mesh.lines:
 122                         st = Statement("batch", "LINES")
 123                         for l in mesh.lines:
 124                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 125                         statements.append(st)
 126
 127                 if mesh.winding_test:
 128                         statements.append(Statement("winding", "COUNTERCLOCKWISE"))
 129
 130                 progress.set_progress(1.0)
 131
 132                 return statements