SWBF-msh-Blender-IO/addons/io_scene_swbf_msh/msh_anim_gather.py

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""" Converts currently active Action to an msh Animation """
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import bpy
import math
from enum import Enum
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 *
from .msh_model_gather import *
from .msh_skeleton_utilities import *
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from .crc import to_crc
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'''
Convert the active Action into an Animation. When exported SWBF anims, there is the issue
that all bones in the anim must be in the skeleton/basepose anim. We guarantee this by
only keying bones if they are in the armature's preserved skeleton (swbf_msh_skel) and
adding dummy frames if the bones are not in the armature.
If a preserved skeleton is not present, we include only the keyed bones and add dummy frames for
the root (root_name)
'''
def extract_anim(armature: bpy.types.Armature, root_name: str) -> Animation:
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if not armature.animation_data or not armature.animation_data.action:
raise RuntimeError("Cannot export animation data without an active Action on armature!")
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action = armature.animation_data.action
# Set of bones to include in SKL2/animation stuff
keyable_bones = get_real_BONES(armature)
# If it doesn't have a preserved skeleton, then we add the scene root.
# If it does have a preserved skeleton, any objects not animatable by blender (i.e. objects above the skeleton, scene root)
# will be included in the preserved skeleton
if not has_preserved_skeleton(armature):
keyable_bones.add(root_name)
# Subset of above bones to key with dummy frames (all bones not in armature)
dummy_bones = set([keyable_bone for keyable_bone in keyable_bones if keyable_bone not in armature.data.bones])
anim = Animation();
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root_crc = to_crc(root_name)
if not action:
framerange = Vector((0.0,1.0))
else:
framerange = action.frame_range
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num_frames = math.floor(framerange.y - framerange.x) + 1
increment = (framerange.y - framerange.x) / (num_frames - 1)
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anim.end_index = num_frames - 1
for keyable_bone in keyable_bones:
anim.bone_frames[to_crc(keyable_bone)] = ([], [])
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for frame in range(num_frames):
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frame_time = framerange.x + frame * increment
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bpy.context.scene.frame_set(frame_time)
for keyable_bone in keyable_bones:
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bone_crc = to_crc(keyable_bone)
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if keyable_bone in dummy_bones:
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rframe = RotationFrame(frame, convert_rotation_space(Quaternion()))
tframe = TranslationFrame(frame, Vector((0.0,0.0,0.0)))
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else:
bone = armature.pose.bones[keyable_bone]
transform = bone.matrix
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if bone.parent:
transform = bone.parent.matrix.inverted() @ transform
loc, rot, _ = transform.decompose()
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rframe = RotationFrame(frame, convert_rotation_space(rot))
tframe = TranslationFrame(frame, convert_vector_space(loc))
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anim.bone_frames[bone_crc][0].append(tframe)
anim.bone_frames[bone_crc][1].append(rframe)
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return anim