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                 resource = self.export_mesh(context, obj, progress)
  36
  37                 resource.write_to_file(out_fn)
  38
  39         def export_mesh(self, context, mesh_or_obj, progress):
  40                 from .mesh import Mesh, create_mesh_from_object
  41
  42                 if type(mesh_or_obj)==Mesh:
  43                         mesh = mesh_or_obj
  44                 else:
  45                         progress.push_task("", 0.0, 0.9)
  46                         mesh = create_mesh_from_object(context, mesh_or_obj, progress)
  47                         progress.pop_task()
  48
  49                 from .datafile import Resource, Statement, Token
  50                 resource = Resource(mesh.name+".mesh", "mesh")
  51                 statements = resource.statements
  52
  53                 st = Statement("vertices", Token("NORMAL3"))
  54                 if mesh.uv_layers:
  55                         for u in mesh.uv_layers:
  56                                 size = str(len(u.uvs[0]))
  57                                 if u.unit==0:
  58                                         st.append(Token("TEXCOORD"+size))
  59                                 else:
  60                                         st.append(Token("TEXCOORD{}_{}".format(size, u.unit)))
  61                         if mesh.tbn_vecs:
  62                                 st.append(Token("TANGENT3"))
  63                                 st.append(Token("BINORMAL3"))
  64                 if mesh.vertex_groups:
  65                         st.append(Token("ATTRIB{}_5".format(mesh.max_groups_per_vertex*2)))
  66                 st.append(Token("VERTEX3"))
  67
  68                 normal = None
  69                 uvs = [None]*len(mesh.uv_layers)
  70                 tan = None
  71                 bino = None
  72                 group = None
  73                 for v in mesh.vertices:
  74                         if v.normal!=normal:
  75                                 st.sub.append(Statement("normal", *v.normal))
  76                                 normal = v.normal
  77                         for i, u in enumerate(mesh.uv_layers):
  78                                 if v.uvs[i]!=uvs[i]:
  79                                         if u.unit==0:
  80                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
  81                                         else:
  82                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
  83                                         uvs[i] = v.uvs[i]
  84                         if mesh.tbn_vecs:
  85                                 if v.tan!=tan:
  86                                         st.sub.append(Statement("tangent", *v.tan))
  87                                         tan = v.tan
  88                                 if v.bino!=bino:
  89                                         st.sub.append(Statement("binormal", *v.bino))
  90                                         bino = v.bino
  91                         if mesh.vertex_groups:
  92                                 group_attr = [(group_index_map[g.group], g.weight*v.group_weight_scale) for g in v.groups[:mesh.max_groups_per_vertex]]
  93                                 while len(group_attr)<mesh.max_groups_per_vertex:
  94                                         group_attr.append((0, 0.0))
  95                                 group_attr = list(itertools.chain(*group_attr))
  96                                 if group_attr!=group:
  97                                         st.sub.append(Statement("attrib", 5, *group_attr))
  98                                         group = group_attr
  99                         st.sub.append(Statement("vertex", *v.co))
 100
 101                 statements.append(st)
 102
 103                 if self.use_strips:
 104                         strips = mesh.vertex_sequence
 105                         if self.use_degen_tris:
 106                                 strips = [self.join_strips(strips)]
 107
 108                         for s in strips:
 109                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
 110                                 for i in range(0, len(s), 32):
 111                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
 112                                 statements.append(st)
 113                 else:
 114                         st = Statement("batch", Token('TRIANGLES'))
 115                         for f in mesh.faces:
 116                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 117                         statements.append(st)
 118
 119                 if mesh.lines:
 120                         st = Statement("batch", Token('LINES'))
 121                         for l in mesh.lines:
 122                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 123                         statements.append(st)
 124
 125                 if mesh.winding_test:
 126                         statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
 127
 128                 progress.set_progress(1.0)
 129
 130                 return resource