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