basic working version

addons/io_scene_swbf_msh/msh_model_gather.py

@@ -0,0 +1,185 @@
+""" Gathers the Blender objects from the current scene and returns them as a list of
+    Model objects. """
+
+import bpy
+from typing import List, Set, Dict
+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. """
+
+    parents = create_parents_set()
+
+    models_list: List[Model] = []
+
+    for obj in bpy.context.scene.objects:
+        if obj.type in SKIPPED_OBJECT_TYPES and obj.name not in parents:
+            continue
+
+        model = Model()
+        model.name = obj.name
+        model.model_type = get_model_type(obj)
+        model.hidden = get_is_model_hidden(obj)
+        model.transform.rotation = obj.rotation_quaternion.copy()
+        model.transform.rotation.rotate(obj.delta_rotation_quaternion)
+        model.transform.translation = 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 = get_object_worldspace_scale(obj)
+            scale_segments(mesh_scale, model.geometry)
+
+        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. """
+
+    mesh.validate_material_indices()
+    mesh.calc_loop_triangles()
+
+    if len(mesh.materials) != 0:
+        return create_mesh_geometry_with_materials(mesh)
+
+    return [create_mesh_geometry_without_materials(mesh)]
+
+def create_mesh_geometry_with_materials(mesh: bpy.types.Mesh) -> List[GeometrySegment]:
+    """ Creates a list of GeometrySegment objects from a Blender mesh
+        that references materials. """
+
+    segments: List[GeometrySegment] = [GeometrySegment() for i in range(len(mesh.materials))]
+    vertex_remap: List[Dict[int, int]] = [dict() for i in range(len(mesh.materials))]
+    polygons: List[Set[int]] = [set() for i in range(len(mesh.materials))]
+
+    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, index : int) -> int:
+        nonlocal segments, vertex_remap
+
+        segment = segments[material_index]
+        remap = vertex_remap[material_index]
+
+        if index in remap:
+            return remap[index]
+
+        new_index: int = len(segment.positions)
+        remap[index] = new_index
+
+        segment.positions.append(mesh.vertices[index].co.copy())
+        segment.normals.append(mesh.vertices[index].normal.copy())
+
+        if mesh.uv_layers.active is None:
+            segment.texcoords.append(Vector((0.0, 0.0)))
+        else:
+            segment.texcoords.append(mesh.uv_layers.active.data[index].uv.copy())
+
+        if segment.colors is not None:
+            segment.colors.append([v for v in mesh.vertex_colors.active.data[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, i) for i in  tri.vertices])
+
+    for segment, remap, polys in zip(segments, vertex_remap, polygons):
+        for poly_index in polys:
+            poly = mesh.polygons[poly_index]
+
+            segment.polygons.append([remap[i] for i in poly.vertices])
+
+    return segments
+
+def create_mesh_geometry_without_materials(mesh: bpy.types.Mesh) -> GeometrySegment:
+    """ Creates a list of GeometrySegment objects from a Blender mesh
+        that doesn't references materials. """
+
+    segment = GeometrySegment()
+
+    for tri in mesh.loop_triangles:
+        segment.triangles.append([i for i in  tri.vertices])
+
+    for vertex in mesh.vertices:
+        segment.positions.append(vertex.co.copy())
+        segment.normals.append(vertex.normal.copy())
+
+    if mesh.uv_layers.active is None:
+        segment.texcoords = [Vector((0.0, 0.0))] * len(mesh.vertices)
+    else:
+        segment.texcoords = [texcoords.uv.copy() for texcoords in mesh.uv_layers.active.data]
+
+    if mesh.vertex_colors.active is not None:
+        segment.colors = [[v for v in color.color] for color in mesh.vertex_colors.active.data]
+
+    for polygon in mesh.polygons:
+        segment.polygons.append([v for v in polygon.vertices])
+
+    return segment
+
+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