blender/io_mspgl/export_mesh.py

   1 import itertools
   2 import os
   3 import bpy
   4 import mathutils
   5
   6 class MeshExporter:
   7         def export_mesh(self, ctx, mesh_or_obj):
   8                 from .mesh import Mesh, create_mesh_from_object
   9
  10                 if type(mesh_or_obj)==Mesh:
  11                         mesh = mesh_or_obj
  12                 else:
  13                         task = ctx.task("Preparing mesh", 0.9)
  14                         mesh = create_mesh_from_object(task, mesh_or_obj)
  15
  16                 from .datafile import Resource, Statement, Token
  17                 resource = Resource(mesh.name+".mesh", "mesh")
  18                 statements = resource.statements
  19
  20                 task = ctx.task("Creating statements", 1.0)
  21
  22                 st = Statement("vertices", Token("VERTEX3_FLOAT"))
  23                 stride = 12
  24                 if mesh.vertices[0].color:
  25                         st.append(Token("COLOR4_UBYTE"))
  26                         stride += 4
  27                 if mesh.uv_layers:
  28                         for u in mesh.uv_layers:
  29                                 size = len(u.uvs[0])
  30                                 min_val = min(*u.uvs[0])
  31                                 max_val = max(*u.uvs[1])
  32                                 for c in u.uvs:
  33                                         min_val = min(min_val, *c)
  34                                         max_val = max(max_val, *c)
  35                                 uv_type = "USHORT" if min_val>=0.0 and max_val<=1.0 else "FLOAT"
  36                                 if uv_type=="FLOAT" and stride%4:
  37                                         pad = 4-stride%4
  38                                         st.append(Token("PADDING{}".format(pad)))
  39                                         stride += pad
  40                                 if u.unit==0:
  41                                         st.append(Token("TEXCOORD{}_{}".format(size, uv_type)))
  42                                 else:
  43                                         st.append(Token("TEXCOORD{}_{}_{}".format(size, u.unit, uv_type)))
  44                                 stride += (2 if uv_type=="USHORT" else 4)*size
  45                 if mesh.vertex_groups:
  46                         st.append(Token("WEIGHT{}_USHORT".format(mesh.max_groups_per_vertex)))
  47                         st.append(Token("GROUP{}_UBYTE".format(mesh.max_groups_per_vertex)))
  48                         stride += 3*mesh.max_groups_per_vertex
  49                 st.append(Token("NORMAL3_BYTE"))
  50                 stride += 3
  51                 if mesh.uv_layers and mesh.tangent_vecs:
  52                         st.append(Token("TANGENT3_BYTE"))
  53                         stride += 3
  54                 if stride%4:
  55                         pad = 4-stride%4
  56                         st.append(Token("PADDING{}_UBYTE".format(pad)))
  57                         stride += pad
  58
  59                 normal = None
  60                 color = None
  61                 uvs = [None]*len(mesh.uv_layers)
  62                 tan = None
  63                 group = None
  64                 weight = None
  65                 for v in mesh.vertices:
  66                         if v.normal!=normal:
  67                                 st.sub.append(Statement("normal", *v.normal))
  68                                 normal = v.normal
  69                         if v.color!=color:
  70                                 st.sub.append(Statement("color", *v.color))
  71                                 color = v.color
  72                         for i, u in enumerate(mesh.uv_layers):
  73                                 if v.uvs[i]!=uvs[i]:
  74                                         if u.unit==0:
  75                                                 st.sub.append(Statement("texcoord", *v.uvs[i]))
  76                                         else:
  77                                                 st.sub.append(Statement("multitexcoord", u.unit, *v.uvs[i]))
  78                                         uvs[i] = v.uvs[i]
  79                         if mesh.tangent_vecs:
  80                                 if v.tan!=tan:
  81                                         st.sub.append(Statement("tangent", *v.tan))
  82                                         tan = v.tan
  83                         if mesh.vertex_groups:
  84                                 v_group = [g.group for g in v.groups]
  85                                 v_weight = [g.weight for g in v.groups]
  86                                 if v_group!=group:
  87                                         st.sub.append(Statement("group", *v_group))
  88                                         group = v_group
  89                                 if v_weight!=weight:
  90                                         st.sub.append(Statement("weight", *v_weight))
  91                                         weight = v_weight
  92                         st.sub.append(Statement("vertex", *v.co))
  93
  94                 statements.append(st)
  95
  96                 if mesh.use_strips:
  97                         for s in mesh.vertex_sequence:
  98                                 st = Statement("batch", Token("TRIANGLE_STRIP"))
  99                                 for i in range(0, len(s), 32):
 100                                         st.sub.append(Statement("indices", *(v.index for v in s[i:i+32])))
 101                                 statements.append(st)
 102                 else:
 103                         st = Statement("batch", Token('TRIANGLES'))
 104                         for f in mesh.faces:
 105                                 st.sub.append(Statement("indices", *(v.index for v in f.vertices)))
 106                         statements.append(st)
 107
 108                 if mesh.lines:
 109                         st = Statement("batch", Token('LINES'))
 110                         for l in mesh.lines:
 111                                 st.sub.append(Statement("indices", *(v.index for v in l.vertices)))
 112                         statements.append(st)
 113
 114                 if mesh.winding_test:
 115                         statements.append(Statement("winding", Token('COUNTERCLOCKWISE')))
 116
 117                 task.set_progress(1.0)
 118
 119                 return resource