blender/io_mspgl/material.py

   1 import os
   2
   3 def get_linked_node_and_socket(node_tree, socket):
   4         for l in node_tree.links:
   5                 if socket==l.to_socket:
   6                         return (l.from_node, l.from_socket)
   7                 elif socket==l.from_socket:
   8                         return (l.to_node, l.to_socket)
   9         return (None, None)
  10
  11 class MaterialProperty:
  12         def __init__(self, value):
  13                 self.value = value
  14                 self.texture = None
  15                 self.tex_usage = None
  16
  17         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
  18                 if type(self.value)==tuple:
  19                         if alpha_socket:
  20                                 self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
  21                         else:
  22                                 self.value = input_socket.default_value[:len(self.value)]
  23                 elif self.value is not None:
  24                         self.value = input_socket.default_value
  25
  26                 from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
  27                 alpha_from = None
  28                 if from_node:
  29                         if from_node.type=='NORMAL_MAP':
  30                                 from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  31
  32                         if alpha_socket:
  33                                 alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
  34                                 if alpha_from and alpha_from!=from_node:
  35                                         raise Exception("Separate textures for color and alpha are not supported")
  36
  37                         if from_node.type=='TEX_IMAGE':
  38                                 self.texture = from_node
  39                                 if alpha_from:
  40                                         self.tex_usage = 'RGBA'
  41                                 elif type(self.value)==tuple:
  42                                         self.tex_usage = 'RGB'
  43                                 else:
  44                                         self.tex_usage = 'GRAY'
  45                         else:
  46                                 raise Exception("Unsupported property input node type "+from_node.type)
  47
  48 class Material:
  49         def __init__(self, material):
  50                 self.name = material.name
  51                 self.type = None
  52                 self.properties = {}
  53
  54                 self.render_mode = material.render_mode
  55                 self.technique = material.technique
  56                 self.shader = material.shader
  57
  58                 if self.render_mode=='EXTERNAL' and not self.technique:
  59                         raise Exception("Missing technique with external rendering mode")
  60                 elif self.render_mode=='CUSTOM' and not self.shader:
  61                         raise Exception("Missing shader with custom rendering mode")
  62
  63                 out_node = None
  64                 for n in material.node_tree.nodes:
  65                         if n.type=='OUTPUT_MATERIAL':
  66                                 out_node = n
  67                                 break
  68
  69                 if not out_node:
  70                         raise Exception("No material output node found")
  71
  72                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
  73                 if not surface_node:
  74                         if self.render_mode=='BUILTIN':
  75                                 raise Exception("Empty material can't use builtin rendering mode")
  76                         return
  77                 elif surface_node.type!='BSDF_PRINCIPLED':
  78                         raise Exception("Unsupported surface node type "+surface_node.type)
  79
  80                 self.type = "pbr"
  81
  82                 base_color = self.properties["base_color"] = MaterialProperty((0.8, 0.8, 0.8, 1.0))
  83                 metalness = self.properties["metalness"] = MaterialProperty(0.0)
  84                 roughness = self.properties["roughness"] = MaterialProperty(0.5)
  85                 normal = self.properties["normal"] = MaterialProperty(None)
  86                 emission = self.properties["emission"] = MaterialProperty((0.0, 0.0, 0.0))
  87
  88                 base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
  89                 metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
  90                 roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
  91                 normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
  92                 emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
  93
  94                 sampler_settings = None
  95                 for p in self.properties.values():
  96                         if p.texture:
  97                                 settings = (p.texture.default_filter, p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
  98                                 if sampler_settings is None:
  99                                         sampler_settings = settings
 100                                 elif settings!=sampler_settings:
 101                                         raise Exception("Conflicting sampler settings in material textures")
 102
 103
 104 class MaterialMap:
 105         def __init__(self, materials):
 106                 self.render_mode = materials[0].render_mode
 107                 if self.render_mode=='EXTERNAL':
 108                         raise Exception("Material map with external render mode does not make sense")
 109
 110                 self.shader = materials[0].shader
 111                 if self.shader:
 112                         self.name = "material_map_"+os.path.splitext(self.shader)[0]
 113                 else:
 114                         self.name = "material_map"
 115                 self.materials = materials
 116                 self.material_names = [m.name for m in self.materials]
 117                 for m in self.materials:
 118                         if m.render_mode!=self.render_mode:
 119                                 raise Exception("Conflicting render modes in MaterialMap constructor")
 120                         if self.render_mode=='CUSTOM' and m.shader!=self.shader:
 121                                 raise Exception("Conflicting shaders in MaterialMap constructor")
 122
 123                 count = len(self.materials)
 124                 size = 1
 125                 while size*size*2<count:
 126                         size *= 2
 127                 if size*size>=count:
 128                         self.size = (size, size)
 129                 else:
 130                         self.size = (size*2, size)
 131
 132                 from .util import get_colormap
 133
 134                 cm = get_colormap(True)
 135                 self.base_color_data = ""
 136                 for m in map(Material, self.materials):
 137                         if any(p.texture for p in m.properties):
 138                                 raise Exception("Texturing is incompatible with material map")
 139                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 140                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 141                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 142
 143         def get_material_uv(self, material):
 144                 index = self.material_names.index(material.name)
 145                 x = index%self.size[0]
 146                 y = index//self.size[0]
 147                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 148
 149 def create_material_map(context, material):
 150         if not material.material_map:
 151                 raise Exception("Material is not part of a material map")
 152
 153         shader = material.shader
 154         materials = []
 155         for m in context.blend_data.materials:
 156                 if m.material_map and m.shader==shader:
 157                         materials.append(m)
 158
 159         mat_map = MaterialMap(materials)
 160
 161         return mat_map