174 lines
8.4 KiB
Python
174 lines
8.4 KiB
Python
from typing import Iterable
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from bpy.types import Object
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from .ase import *
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import bpy
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import bmesh
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import math
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from mathutils import Matrix
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class ASEBuilderError(Exception):
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pass
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class ASEBuilderOptions(object):
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def __init__(self):
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self.scale = 1.0
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self.use_raw_mesh_data = False
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class ASEBuilder(object):
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def build(self, context, options: ASEBuilderOptions, objects: Iterable[Object]):
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ase = ASE()
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main_geometry_object = None
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for selected_object in objects:
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if selected_object is None or selected_object.type != 'MESH':
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continue
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# Evaluate the mesh after modifiers are applied
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if options.use_raw_mesh_data:
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mesh_object = selected_object
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mesh_data = mesh_object.data
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else:
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depsgraph = context.evaluated_depsgraph_get()
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bm = bmesh.new()
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bm.from_object(selected_object, depsgraph)
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mesh_data = bpy.data.meshes.new('')
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bm.to_mesh(mesh_data)
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del bm
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mesh_object = bpy.data.objects.new('', mesh_data)
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mesh_object.matrix_world = selected_object.matrix_world
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if not is_collision_name(selected_object.name) and main_geometry_object is not None:
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geometry_object = main_geometry_object
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else:
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geometry_object = ASEGeometryObject()
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geometry_object.name = selected_object.name
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if not geometry_object.is_collision:
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main_geometry_object = geometry_object
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ase.geometry_objects.append(geometry_object)
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if geometry_object.is_collision:
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# Test that collision meshes are manifold and convex.
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bm = bmesh.new()
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bm.from_mesh(mesh_object.data)
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for edge in bm.edges:
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if not edge.is_manifold:
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del bm
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raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not manifold')
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if not edge.is_convex:
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del bm
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raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not convex')
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if not geometry_object.is_collision and len(selected_object.data.materials) == 0:
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raise ASEBuilderError(f'Mesh \'{selected_object.name}\' must have at least one material')
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vertex_transform = Matrix.Scale(options.scale, 4) @ Matrix.Rotation(math.pi, 4, 'Z') @ mesh_object.matrix_world
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for vertex_index, vertex in enumerate(mesh_data.vertices):
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geometry_object.vertices.append(vertex_transform @ vertex.co)
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material_indices = []
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if not geometry_object.is_collision:
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for mesh_material_index, material in enumerate(selected_object.data.materials):
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if material is None:
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raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{selected_object.name}\' cannot be empty')
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try:
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# Reuse existing material entries for duplicates
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material_index = ase.materials.index(material.name)
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except ValueError:
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material_index = len(ase.materials)
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ase.materials.append(material.name)
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material_indices.append(material_index)
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mesh_data.calc_loop_triangles()
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poly_groups, groups = mesh_data.calc_smooth_groups(use_bitflags=False)
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# Faces
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for face_index, loop_triangle in enumerate(mesh_data.loop_triangles):
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face = ASEFace()
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face.a = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[0]].vertex_index
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face.b = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[1]].vertex_index
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face.c = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[2]].vertex_index
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if not geometry_object.is_collision:
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face.material_index = material_indices[loop_triangle.material_index]
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# The UT2K4 importer only accepts 32 smoothing groups. Anything past this completely mangles the
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# smoothing groups and effectively makes the whole model use sharp-edge rendering.
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# The fix is to constrain the smoothing group between 0 and 31 by applying a modulo of 32 to the actual
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# smoothing group index.
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# This may result in bad calculated normals on export in rare cases. For example, if a face with a
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# smoothing group of 3 is adjacent to a face with a smoothing group of 35 (35 % 32 == 3), those faces
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# will be treated as part of the same smoothing group.
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face.smoothing = (poly_groups[loop_triangle.polygon_index] - 1) % 32
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geometry_object.faces.append(face)
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# Figure out how many scaling axes are negative.
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# This is important for calculating the normals of the mesh.
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_, _, scale = vertex_transform.decompose()
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negative_scaling_axes = sum([1 for x in scale if x < 0])
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should_invert_normals = negative_scaling_axes % 2 == 1
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if should_invert_normals:
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for face in geometry_object.faces:
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face.a, face.c = face.c, face.a
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if not geometry_object.is_collision:
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# Normals
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for face_index, loop_triangle in enumerate(mesh_data.loop_triangles):
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face_normal = ASEFaceNormal()
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face_normal.normal = loop_triangle.normal
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face_normal.vertex_normals = []
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for i in range(3):
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vertex_normal = ASEVertexNormal()
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vertex_normal.vertex_index = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[i]].vertex_index
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vertex_normal.normal = loop_triangle.split_normals[i]
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face_normal.vertex_normals.append(vertex_normal)
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geometry_object.face_normals.append(face_normal)
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# Texture Coordinates
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for i, uv_layer_data in enumerate([x.data for x in mesh_data.uv_layers]):
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if i >= len(geometry_object.uv_layers):
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geometry_object.uv_layers.append(ASEUVLayer())
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uv_layer = geometry_object.uv_layers[i]
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for loop_index, loop in enumerate(mesh_data.loops):
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u, v = uv_layer_data[loop_index].uv
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uv_layer.texture_vertices.append((u, v, 0.0))
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# Texture Faces
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for loop_triangle in mesh_data.loop_triangles:
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if should_invert_normals:
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geometry_object.texture_vertex_faces.append((
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geometry_object.texture_vertex_offset + loop_triangle.loops[2],
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geometry_object.texture_vertex_offset + loop_triangle.loops[1],
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geometry_object.texture_vertex_offset + loop_triangle.loops[0]
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))
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else:
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geometry_object.texture_vertex_faces.append((
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geometry_object.texture_vertex_offset + loop_triangle.loops[0],
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geometry_object.texture_vertex_offset + loop_triangle.loops[1],
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geometry_object.texture_vertex_offset + loop_triangle.loops[2]
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))
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# Vertex Colors
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if len(mesh_data.vertex_colors) > 0:
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if mesh_data.vertex_colors.active is not None:
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vertex_colors = mesh_data.vertex_colors.active.data
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for color in map(lambda x: x.color, vertex_colors):
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geometry_object.vertex_colors.append(tuple(color[0:3]))
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# Update data offsets for next iteration
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geometry_object.texture_vertex_offset += len(mesh_data.loops)
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geometry_object.vertex_offset = len(geometry_object.vertices)
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if len(ase.geometry_objects) == 0:
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raise ASEBuilderError('At least one mesh object must be selected')
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if main_geometry_object is None:
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raise ASEBuilderError('At least one non-collision mesh must be exported')
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return ase
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