258 lines
9.7 KiB
Python
258 lines
9.7 KiB
Python
""" Gathers the Blender objects from the current scene and returns them as a list of
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Model objects. """
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import bpy
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import math
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from typing import List, Set, Dict, Tuple
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from itertools import zip_longest
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from .msh_model import *
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from .msh_model_utilities import *
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from .msh_utilities import *
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SKIPPED_OBJECT_TYPES = {"LATTICE", "CAMERA", "LIGHT", "SPEAKER", "LIGHT_PROBE"}
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MESH_OBJECT_TYPES = {"MESH", "CURVE", "SURFACE", "META", "FONT", "GPENCIL"}
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MAX_MSH_VERTEX_COUNT = 32767
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def gather_models() -> List[Model]:
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""" Gathers the Blender objects from the current scene and returns them as a list of
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Model objects. """
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depsgraph = bpy.context.evaluated_depsgraph_get()
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parents = create_parents_set()
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models_list: List[Model] = []
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for uneval_obj in bpy.context.scene.objects:
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if uneval_obj.type in SKIPPED_OBJECT_TYPES and uneval_obj.name not in parents:
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continue
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obj = uneval_obj.evaluated_get(depsgraph)
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local_translation, local_rotation, _ = obj.matrix_local.decompose()
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model = Model()
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model.name = obj.name
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model.model_type = get_model_type(obj)
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model.hidden = get_is_model_hidden(obj)
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model.transform.rotation = convert_rotation_space(local_rotation)
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model.transform.translation = convert_vector_space(local_translation)
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if obj.parent is not None:
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model.parent = obj.parent.name
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if obj.type in MESH_OBJECT_TYPES:
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mesh = obj.to_mesh()
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model.geometry = create_mesh_geometry(mesh)
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obj.to_mesh_clear()
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_, _, world_scale = obj.matrix_world.decompose()
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world_scale = convert_scale_space(world_scale)
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scale_segments(world_scale, model.geometry)
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for segment in model.geometry:
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if len(segment.positions) > MAX_MSH_VERTEX_COUNT:
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raise RuntimeError(f"Object '{obj.name}' has resulted in a .msh geometry segment that has "
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f"more than {MAX_MSH_VERTEX_COUNT} vertices! Split the object's mesh up "
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f"and try again!")
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if get_is_collision_primitive(obj):
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model.collisionprimitive = get_collision_primitive(obj)
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models_list.append(model)
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return models_list
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def create_parents_set() -> Set[str]:
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""" Creates a set with the names of the Blender objects from the current scene
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that have at least one child. """
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parents = set()
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for obj in bpy.context.scene.objects:
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if obj.parent is not None:
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parents.add(obj.parent.name)
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return parents
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def create_mesh_geometry(mesh: bpy.types.Mesh) -> List[GeometrySegment]:
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""" Creates a list of GeometrySegment objects from a Blender mesh.
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Does NOT create triangle strips in the GeometrySegment however. """
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if mesh.has_custom_normals:
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mesh.calc_normals_split()
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mesh.validate_material_indices()
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mesh.calc_loop_triangles()
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material_count = max(len(mesh.materials), 1)
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segments: List[GeometrySegment] = [GeometrySegment() for i in range(material_count)]
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vertex_cache: List[Dict[Tuple[float], int]] = [dict() for i in range(material_count)]
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vertex_remap: List[Dict[Tuple[int, int], int]] = [dict() for i in range(material_count)]
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polygons: List[Set[int]] = [set() for i in range(material_count)]
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if mesh.vertex_colors.active is not None:
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for segment in segments:
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segment.colors = []
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for segment, material in zip(segments, mesh.materials):
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segment.material_name = material.name
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def add_vertex(material_index: int, vertex_index: int, loop_index: int) -> int:
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nonlocal segments, vertex_remap
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vertex_cache_miss_index = -1
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segment = segments[material_index]
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cache = vertex_cache[material_index]
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remap = vertex_remap[material_index]
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def get_cache_vertex(vertex_index: int, loop_index: int):
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yield mesh.vertices[vertex_index].co.x
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yield mesh.vertices[vertex_index].co.y
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yield mesh.vertices[vertex_index].co.z
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if mesh.has_custom_normals:
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yield mesh.loops[loop_index].normal.x
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yield mesh.loops[loop_index].normal.y
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yield mesh.loops[loop_index].normal.z
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else:
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yield mesh.vertices[vertex_index].normal.x
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yield mesh.vertices[vertex_index].normal.y
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yield mesh.vertices[vertex_index].normal.z
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if mesh.uv_layers.active is not None:
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yield mesh.uv_layers.active.data[loop_index].uv.x
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yield mesh.uv_layers.active.data[loop_index].uv.y
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if segment.colors is not None:
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for v in mesh.vertex_colors.active.data[loop_index]:
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yield v
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vertex_cache_entry = tuple(get_cache_vertex(vertex_index, loop_index))
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cached_vertex_index = cache.get(vertex_cache_entry, vertex_cache_miss_index)
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if cached_vertex_index != vertex_cache_miss_index:
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remap[(vertex_index, loop_index)] = cached_vertex_index
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return cached_vertex_index
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new_index: int = len(segment.positions)
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cache[vertex_cache_entry] = new_index
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remap[(vertex_index, loop_index)] = new_index
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segment.positions.append(convert_vector_space(mesh.vertices[vertex_index].co))
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if mesh.has_custom_normals:
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segment.normals.append(convert_vector_space(mesh.loops[loop_index].normal))
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else:
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segment.normals.append(convert_vector_space(mesh.vertices[vertex_index].normal))
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if mesh.uv_layers.active is None:
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segment.texcoords.append(Vector((0.0, 0.0)))
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else:
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segment.texcoords.append(mesh.uv_layers.active.data[loop_index].uv.copy())
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if segment.colors is not None:
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segment.colors.append([v for v in mesh.vertex_colors.active.data[loop_index].color])
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return new_index
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for tri in mesh.loop_triangles:
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polygons[tri.material_index].add(tri.polygon_index)
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segments[tri.material_index].triangles.append([
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add_vertex(tri.material_index, tri.vertices[0], tri.loops[0]),
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add_vertex(tri.material_index, tri.vertices[1], tri.loops[1]),
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add_vertex(tri.material_index, tri.vertices[2], tri.loops[2])])
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for segment, remap, polys in zip(segments, vertex_remap, polygons):
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for poly_index in polys:
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poly = mesh.polygons[poly_index]
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segment.polygons.append([remap[(v, l)] for v, l in zip(poly.vertices, poly.loop_indices)])
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return segments
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def get_model_type(obj: bpy.types.Object) -> ModelType:
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""" Get the ModelType for a Blender object. """
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# TODO: Skinning support, etc
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if obj.type in MESH_OBJECT_TYPES:
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return ModelType.STATIC
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return ModelType.NULL
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def get_is_model_hidden(obj: bpy.types.Object) -> bool:
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""" Gets if a Blender object should be marked as hidden in the .msh file. """
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name = obj.name.lower()
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if name.startswith("sv_"):
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return True
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if name.startswith("p_"):
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return True
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if name.startswith("collision"):
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return True
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if obj.type not in MESH_OBJECT_TYPES:
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return True
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return False
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def get_is_collision_primitive(obj: bpy.types.Object) -> bool:
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""" Gets if a Blender object represents a collision primitive. """
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name = obj.name.lower()
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return name.startswith("p_")
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def get_collision_primitive(obj: bpy.types.Object) -> CollisionPrimitive:
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""" Gets the CollisionPrimitive of an object or raises an error if
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it can't. """
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primitive = CollisionPrimitive()
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primitive.shape = get_collision_primitive_shape(obj)
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if primitive.shape == CollisionPrimitiveShape.SPHERE:
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# Tolerate a 5% difference to account for icospheres with 2 subdivisions.
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if not (math.isclose(obj.dimensions[0], obj.dimensions[1], rel_tol=0.05) and
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math.isclose(obj.dimensions[0], obj.dimensions[2], rel_tol=0.05)):
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raise RuntimeError(f"Object '{obj.name}' is being used as a sphere collision "
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f"primitive but it's dimensions are not uniform!")
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primitive.radius = max(obj.dimensions[0], obj.dimensions[1], obj.dimensions[2]) * 0.5
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elif primitive.shape == CollisionPrimitiveShape.CYLINDER:
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if not math.isclose(obj.dimensions[0], obj.dimensions[1], rel_tol=0.001):
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raise RuntimeError(f"Object '{obj.name}' is being used as a cylinder collision "
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f"primitive but it's X and Y dimensions are not uniform!")
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primitive.radius = obj.dimensions[0] * 0.5
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primitive.height = obj.dimensions[2]
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elif primitive.shape == CollisionPrimitiveShape.BOX:
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primitive.radius = obj.dimensions[0] * 0.5
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primitive.height = obj.dimensions[2] * 0.5
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primitive.length = obj.dimensions[1] * 0.5
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return primitive
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def get_collision_primitive_shape(obj: bpy.types.Object) -> CollisionPrimitiveShape:
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""" Gets the CollisionPrimitiveShape of an object or raises an error if
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it can't. """
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name = obj.name.lower()
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if "sphere" in name or "sphr" in name or "spr" in name:
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return CollisionPrimitiveShape.SPHERE
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if "cylinder" in name or "cyln" in name or "cyl" in name:
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return CollisionPrimitiveShape.CYLINDER
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if "box" in name or "cube" in name or "cuboid" in name:
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return CollisionPrimitiveShape.BOX
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raise RuntimeError(f"Object '{obj.name}' has no primitive type specified in it's name!")
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def convert_vector_space(vec: Vector) -> Vector:
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return Vector((-vec.x, vec.z, vec.y))
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def convert_scale_space(vec: Vector) -> Vector:
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return Vector(vec.xzy)
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def convert_rotation_space(quat: Quaternion) -> Quaternion:
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return Quaternion((-quat.w, quat.x, -quat.z, -quat.y))
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