blender/io_mspgl/export_mesh.py

   1 class MeshExporter:
   2         def export_mesh(self, ctx, mesh_or_obj):
   3                 from .mesh import Mesh, create_mesh_from_object
   4
   5                 if type(mesh_or_obj)==Mesh:
   6                         mesh = mesh_or_obj
   7                 else:
   8                         task = ctx.task("Preparing mesh", 0.9)
   9                         mesh = create_mesh_from_object(task, mesh_or_obj)
  10
  11                 from .datafile import Resource, Statement, Token
  12                 resource = Resource(mesh.name+".mesh", "mesh")
  13                 statements = resource.statements
  14
  15                 task = ctx.task("Creating statements", 1.0)
  16
  17                 st = Statement("vertices", Token("VERTEX3_FLOAT"))
  18                 stride = 12
  19                 if mesh.vertices[0].color:
  20                         st.append(Token("COLOR4_UBYTE"))
  21                         stride += 4
  22                 if mesh.uv_layers:
  23                         for u in mesh.uv_layers:
  24                                 size = len(u.uvs[0])
  25                                 min_val = min(*u.uvs[0])
  26                                 max_val = max(*u.uvs[1])
  27                                 for c in u.uvs:
  28                                         min_val = min(min_val, *c)
  29                                         max_val = max(max_val, *c)
  30                                 uv_type = "USHORT" if min_val>=0.0 and max_val<=1.0 else "FLOAT"
  31                                 if uv_type=="FLOAT" and stride%4:
  32                                         pad = 4-stride%4
  33                                         st.append(Token("PADDING{}".format(pad)))
  34                                         stride += pad
  35                                 if u.unit==0:
  36                                         st.append(Token("TEXCOORD{}_{}".format(size, uv_type)))
  37                                 else:
  38                                         st.append(Token("TEXCOORD{}_{}_{}".format(size, u.unit, uv_type)))
  39                                 stride += (2 if uv_type=="USHORT" else 4)*size
  40                 if mesh.vertex_groups:
  41                         st.append(Token("WEIGHT{}_USHORT".format(mesh.max_groups_per_vertex)))
  42                         st.append(Token("GROUP{}_UBYTE".format(mesh.max_groups_per_vertex)))
  43                         stride += 3*mesh.max_groups_per_vertex
  44                 st.append(Token("NORMAL3_BYTE"))
  45                 stride += 3
  46                 if mesh.uv_layers and mesh.tangent_vecs:
  47                         st.append(Token("TANGENT3_BYTE"))
  48                         stride += 3
  49                 if stride%4:
  50                         pad = 4-stride%4
  51                         st.append(Token("PADDING{}_UBYTE".format(pad)))
  52                         stride += pad
  53
  54                 normal = None
  55                 color = None
  56                 uvs = [None]*len(mesh.uv_layers)
  57                 tan = None
  58                 group = None
  59                 weight = None
  60                 for v in mesh.vertices:
  61                         if v.normal!=normal:
  62                                 st.sub.append(Statement("normal", *v.normal))
  63                                 normal = v.normal
  64                         if v.color!=color:
  65                                 st.sub.append(Statement("color", *v.color))
  66                                 color = v.color
  67                         for i, u in enumerate(mesh.uv_layers):
  68                                 if v.uvs[i]!=uvs[i]:
  69                                         if u.unit==0:
  70                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
  71                                         else:
  72                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
  73                                         uvs[i] = v.uvs[i]
  74                         if mesh.tangent_vecs:
  75                                 if v.tan!=tan:
  76                                         st.sub.append(Statement("tangent", *v.tan))
  77                                         tan = v.tan
  78                         if mesh.vertex_groups:
  79                                 v_group = [g.group for g in v.groups]
  80                                 v_weight = [g.weight for g in v.groups]
  81                                 if v_group!=group:
  82                                         st.sub.append(Statement("group", *v_group))
  83                                         group = v_group
  84                                 if v_weight!=weight:
  85                                         st.sub.append(Statement("weight", *v_weight))
  86                                         weight = v_weight
  87                         st.sub.append(Statement("vertex", *v.co))
  88
  89                 statements.append(st)
  90
  91                 if mesh.use_strips:
  92                         for s in mesh.vertex_sequence:
  93                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
  94                                 for i in range(0, len(s), 32):
  95                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
  96                                 statements.append(st)
  97                 else:
  98                         st = Statement("batch", Token('TRIANGLES'))
  99                         for f in mesh.faces:
 100                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 101                         statements.append(st)
 102
 103                 if mesh.lines:
 104                         st = Statement("batch", Token('LINES'))
 105                         for l in mesh.lines:
 106                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 107                         statements.append(st)
 108
 109                 if mesh.winding_test:
 110                         statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
 111
 112                 task.set_progress(1.0)
 113
 114                 return resource