Export to blend file for cloud rendering
This commit is contained in:
Stefan Cepko
@@ -0,0 +1,475 @@
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"""
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bake_export.py
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--------------
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Operator to bake the AnimKnots procedural animation into a fully
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self-contained .blend file suitable for distributed render farms
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(SheepIt, etc.).
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The resulting file contains:
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- One mesh object per unique frame, with hide_render / hide_viewport
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keyframes so only the correct mesh is visible on each frame.
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- All materials (preset, blend, project) referenced by the objects.
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- Camera with baked delta_location keyframes (camera shake).
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- Light, world, and render settings copied from the source scene.
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- No addon dependencies — the file is fully standalone.
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"""
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from __future__ import annotations
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import hashlib
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import random
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import struct
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import bpy
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from bpy_extras.io_utils import ExportHelper
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from .constants import KNOT_OBJ_NAME
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# ---------------------------------------------------------------------------
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# Blender 5.0 compat — Action.fcurves was replaced with layered actions
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# ---------------------------------------------------------------------------
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def _get_action_fcurves(obj):
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"""Return an iterable of FCurves for the given object's animation.
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Blender 5.0 replaced ``action.fcurves`` with a layered animation
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system (slots → layers → strips → channelbags → fcurves). This
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helper abstracts both APIs so the rest of the module doesn't care.
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"""
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anim = obj.animation_data
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if not anim or not anim.action:
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return []
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action = anim.action
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# ── Blender 5.0+ (layered actions) ────────────────────────────────────
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# Try the convenience helper first
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try:
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from bpy_extras.anim_utils import action_get_channelbag_for_slot # noqa: F401
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slot = anim.action_slot
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if slot is not None:
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for layer in action.layers:
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for strip in layer.strips:
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cb = strip.channelbag(slot)
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if cb is not None:
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return cb.fcurves
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return []
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except (ImportError, AttributeError):
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pass
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# ── Blender 4.x (legacy) ──────────────────────────────────────────────
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try:
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return action.fcurves
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except AttributeError:
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return []
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# ---------------------------------------------------------------------------
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# Helpers
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# ---------------------------------------------------------------------------
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def _mesh_fingerprint(mesh: bpy.types.Mesh) -> str:
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"""Compute a fast hash of a mesh's vertex positions + material index.
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Used to detect consecutive identical frames so we can extend the
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previous object's visibility window instead of creating a duplicate.
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"""
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h = hashlib.md5(usedforsecurity=False)
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# Hash vertex positions
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for v in mesh.vertices:
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h.update(struct.pack('fff', *v.co))
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# Hash which material slots are assigned
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for slot_idx, slot in enumerate(mesh.materials):
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name = slot.name if slot else ""
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h.update(f"{slot_idx}:{name}".encode())
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return h.hexdigest()
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def _obj_transform_fingerprint(obj: bpy.types.Object) -> str:
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"""Hash an object's location, rotation_euler, and scale."""
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h = hashlib.md5(usedforsecurity=False)
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h.update(struct.pack('fff', *obj.location))
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h.update(struct.pack('fff', *obj.rotation_euler))
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h.update(struct.pack('fff', *obj.scale))
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return h.hexdigest()
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def _keyframe_visibility(obj, frame: int, visible: bool) -> None:
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"""Insert hide_render and hide_viewport keyframes for a single frame."""
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obj.hide_render = not visible
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obj.hide_viewport = not visible
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obj.keyframe_insert(data_path="hide_render", frame=frame)
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obj.keyframe_insert(data_path="hide_viewport", frame=frame)
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def _set_constant_interpolation(obj) -> None:
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"""Set all visibility F-curves to CONSTANT interpolation.
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This prevents Blender from smoothly fading between True/False,
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which would make objects partially visible on intermediate frames.
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"""
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for fc in _get_action_fcurves(obj):
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if fc.data_path in ("hide_render", "hide_viewport"):
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for kp in fc.keyframe_points:
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kp.interpolation = 'CONSTANT'
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# ---------------------------------------------------------------------------
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# Main bake operator
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# ---------------------------------------------------------------------------
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class KNOT_OT_BakeExport(bpy.types.Operator, ExportHelper):
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"""Bake the procedural animation into a standalone .blend file."""
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bl_idname = "knot.bake_export"
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bl_label = "Bake & Export for Render Farm"
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bl_description = (
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"Iterate every frame, convert the procedural knot to mesh, "
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"and save a self-contained .blend with per-frame visibility keyframes. "
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"The output file requires no addons and is render-farm ready"
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)
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bl_options = {'REGISTER'}
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# ExportHelper provides the file browser
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filename_ext = ".blend"
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filter_glob: bpy.props.StringProperty(default="*.blend", options={'HIDDEN'})
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# User-facing options shown in the file browser sidebar
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use_render_resolution: bpy.props.BoolProperty(
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name="Use Render Resolution",
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description="Bake at the Render Curve / Bevel resolution (recommended for final output)",
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default=True,
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)
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pack_textures: bpy.props.BoolProperty(
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name="Pack Textures",
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description="Pack all external textures into the .blend file",
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default=True,
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)
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chunk_frames: bpy.props.IntProperty(
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name="Frames per File",
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description=(
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"Split the export into multiple .blend files, each covering this many frames. "
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"Set to 0 for a single file (no splitting)"
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),
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default=0,
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min=0,
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max=10000,
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)
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# -------------------------------------------------------------------
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# Chunk bake helper
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# -------------------------------------------------------------------
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def _bake_chunk(self, context, chunk_start, chunk_end, filepath):
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"""Bake a single frame range and save to *filepath*.
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Creates mesh objects, sets up visibility keyframes, bakes camera
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shake, removes the AnimKnot, packs data, saves a copy, then
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cleans up all baked objects from the session so the next chunk
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starts fresh.
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Returns the list of baked_objects so the caller can report stats.
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"""
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scene = context.scene
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glob = scene.knot_globals
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# -----------------------------------------------------------
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# Phase 1: Bake per-frame geometry
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# -----------------------------------------------------------
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baked_objects: list[tuple[bpy.types.Object, int, int]] = []
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prev_fingerprint = None
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prev_transform_fp = None
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bake_coll = bpy.data.collections.new("BakedAnimation")
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scene.collection.children.link(bake_coll)
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for f in range(chunk_start, chunk_end + 1):
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scene.frame_set(f)
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knot_obj = bpy.data.objects.get(KNOT_OBJ_NAME)
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if not knot_obj:
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continue
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depsgraph = context.evaluated_depsgraph_get()
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eval_obj = knot_obj.evaluated_get(depsgraph)
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mesh = bpy.data.meshes.new_from_object(eval_obj, depsgraph=depsgraph)
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mesh.name = f"BakedKnot_Mesh_F{f}"
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mesh_fp = _mesh_fingerprint(mesh)
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transform_fp = _obj_transform_fingerprint(knot_obj)
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if (mesh_fp == prev_fingerprint
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and transform_fp == prev_transform_fp
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and baked_objects):
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bpy.data.meshes.remove(mesh)
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_, first_f, _ = baked_objects[-1]
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baked_objects[-1] = (baked_objects[-1][0], first_f, f)
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continue
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prev_fingerprint = mesh_fp
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prev_transform_fp = transform_fp
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obj = bpy.data.objects.new(f"BakedKnot_F{f}", mesh)
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obj.location = knot_obj.location.copy()
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obj.rotation_euler = knot_obj.rotation_euler.copy()
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obj.scale = knot_obj.scale.copy()
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for src_slot in knot_obj.material_slots:
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obj.data.materials.append(src_slot.material)
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obj.display_type = knot_obj.display_type
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bake_coll.objects.link(obj)
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baked_objects.append((obj, f, f))
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if not baked_objects:
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bake_coll_check = bpy.data.collections.get("BakedAnimation")
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if bake_coll_check:
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bpy.data.collections.remove(bake_coll_check)
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return []
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# -----------------------------------------------------------
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# Phase 2: Visibility keyframes
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# -----------------------------------------------------------
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for obj, first_f, last_f in baked_objects:
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if first_f > chunk_start:
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_keyframe_visibility(obj, chunk_start, False)
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if first_f > chunk_start + 1:
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_keyframe_visibility(obj, first_f - 1, False)
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_keyframe_visibility(obj, first_f, True)
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if last_f != first_f:
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_keyframe_visibility(obj, last_f, True)
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if last_f < chunk_end:
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_keyframe_visibility(obj, last_f + 1, False)
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if last_f < chunk_end - 1:
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_keyframe_visibility(obj, chunk_end, False)
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_set_constant_interpolation(obj)
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# -----------------------------------------------------------
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# Phase 3: Camera shake
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# -----------------------------------------------------------
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cam = scene.camera
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if cam and glob.camera_shake_amplitude > 0.0:
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shake = glob.camera_shake_amplitude
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for f in range(chunk_start, chunk_end + 1):
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random.seed(int(f * 1000))
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cam.delta_location = (
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random.uniform(-shake, shake),
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random.uniform(-shake, shake),
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random.uniform(-shake, shake),
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)
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cam.keyframe_insert(data_path="delta_location", frame=f)
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for fc in _get_action_fcurves(cam):
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if fc.data_path == "delta_location":
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for kp in fc.keyframe_points:
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kp.interpolation = 'LINEAR'
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elif cam:
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cam.delta_location = (0.0, 0.0, 0.0)
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# -----------------------------------------------------------
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# Phase 4: Remove AnimKnot + handler for clean save
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# -----------------------------------------------------------
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knot_obj = bpy.data.objects.get(KNOT_OBJ_NAME)
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if knot_obj:
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curve_data = knot_obj.data
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bpy.data.objects.remove(knot_obj, do_unlink=True)
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if curve_data and curve_data.users == 0:
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bpy.data.curves.remove(curve_data)
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from .handler import knot_frame_handler
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handlers = bpy.app.handlers.frame_change_post
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for h in list(handlers):
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if getattr(h, "__name__", "") == knot_frame_handler.__name__:
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handlers.remove(h)
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# -----------------------------------------------------------
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# Phase 5: Set chunk frame range, pack, clean orphans
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# -----------------------------------------------------------
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orig_frame_start = scene.frame_start
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orig_frame_end = scene.frame_end
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orig_file_format = scene.render.image_settings.file_format
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orig_color_mode = scene.render.image_settings.color_mode
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scene.frame_start = chunk_start
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scene.frame_end = chunk_end
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scene.render.image_settings.file_format = 'PNG'
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scene.render.image_settings.color_mode = 'RGBA'
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try:
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bpy.ops.file.make_paths_relative()
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except RuntimeError:
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pass
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if self.pack_textures:
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try:
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bpy.ops.file.pack_all()
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except RuntimeError:
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self.report({'WARNING'}, "Some external files could not be packed.")
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for mat in list(bpy.data.materials):
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if mat.users == 0:
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bpy.data.materials.remove(mat)
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for m in list(bpy.data.meshes):
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if m.users == 0:
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bpy.data.meshes.remove(m)
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for c in list(bpy.data.curves):
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if c.users == 0:
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bpy.data.curves.remove(c)
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# -----------------------------------------------------------
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# Phase 6: Save as copy
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# -----------------------------------------------------------
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bpy.ops.wm.save_as_mainfile(filepath=filepath, copy=True)
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# -----------------------------------------------------------
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# Phase 7: Clean up — restore session for next chunk
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# -----------------------------------------------------------
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scene.frame_start = orig_frame_start
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scene.frame_end = orig_frame_end
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scene.render.image_settings.file_format = orig_file_format
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scene.render.image_settings.color_mode = orig_color_mode
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# Remove baked objects
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for obj, _, _ in baked_objects:
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if obj and obj.name in bpy.data.objects:
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mesh_data = obj.data
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bpy.data.objects.remove(obj, do_unlink=True)
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if mesh_data and mesh_data.users == 0:
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bpy.data.meshes.remove(mesh_data)
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bake_coll_check = bpy.data.collections.get("BakedAnimation")
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if bake_coll_check:
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bpy.data.collections.remove(bake_coll_check)
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# Remove camera shake keyframes
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if cam:
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cam_fcurves = _get_action_fcurves(cam)
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fcurves_to_remove = [
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fc for fc in cam_fcurves
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if fc.data_path == "delta_location"
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]
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for fc in fcurves_to_remove:
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try:
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cam_fcurves.remove(fc)
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except (TypeError, RuntimeError):
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pass
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cam.delta_location = (0.0, 0.0, 0.0)
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# Re-register handler and rebuild the AnimKnot
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handlers = bpy.app.handlers.frame_change_post
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already_registered = any(
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getattr(h, "__name__", "") == knot_frame_handler.__name__
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for h in handlers
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)
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if not already_registered:
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handlers.append(knot_frame_handler)
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knot_frame_handler(scene)
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return baked_objects
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# -------------------------------------------------------------------
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# execute
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# -------------------------------------------------------------------
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def execute(self, context):
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scene = context.scene
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glob = scene.knot_globals
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# Validate
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if len(scene.knot_list) == 0:
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self.report({'ERROR'}, "Playlist is empty — nothing to bake.")
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return {'CANCELLED'}
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knot_obj = bpy.data.objects.get(KNOT_OBJ_NAME)
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if not knot_obj:
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self.report({'ERROR'}, f"AnimKnot object '{KNOT_OBJ_NAME}' not found.")
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return {'CANCELLED'}
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filepath = self.filepath
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if not filepath.lower().endswith(".blend"):
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filepath += ".blend"
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frame_start = scene.frame_start
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frame_end = scene.frame_end
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total_frames = frame_end - frame_start + 1
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original_frame = scene.frame_current
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# Temporarily override preview resolution to render quality
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orig_preview_res = glob.preview_resolution
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orig_preview_bevel = glob.preview_bevel_resolution
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if self.use_render_resolution:
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glob.preview_resolution = glob.render_resolution
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glob.preview_bevel_resolution = glob.render_bevel_resolution
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# Build the list of (chunk_start, chunk_end, output_path) tuples
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if self.chunk_frames > 0:
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base = filepath[:-6] # strip ".blend"
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chunks = []
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idx = 1
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cs = frame_start
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while cs <= frame_end:
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ce = min(cs + self.chunk_frames - 1, frame_end)
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chunks.append((cs, ce, f"{base}_{idx:03d}.blend"))
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cs = ce + 1
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idx += 1
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else:
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chunks = [(frame_start, frame_end, filepath)]
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self.report({'INFO'},
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f"Baking {total_frames} frames into {len(chunks)} file(s)...")
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total_unique = 0
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for ci, (cs, ce, out_path) in enumerate(chunks):
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self.report({'INFO'},
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f"Chunk {ci+1}/{len(chunks)}: frames {cs}–{ce} → {out_path}")
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baked = self._bake_chunk(context, cs, ce, out_path)
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total_unique += len(baked)
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# Restore resolution
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if self.use_render_resolution:
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glob.preview_resolution = orig_preview_res
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glob.preview_bevel_resolution = orig_preview_bevel
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# Restore frame
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scene.frame_set(original_frame)
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if len(chunks) == 1:
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self.report({'INFO'},
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f"Baked .blend saved to: {chunks[0][2]} "
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f"({total_unique} unique meshes)")
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else:
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self.report({'INFO'},
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f"Exported {len(chunks)} files "
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f"({total_unique} unique meshes total)")
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return {'FINISHED'}
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def draw(self, context):
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"""Draw options in the file browser sidebar."""
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layout = self.layout
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layout.label(text="Bake Options:", icon='SETTINGS')
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layout.prop(self, "use_render_resolution")
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layout.prop(self, "pack_textures")
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layout.separator()
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layout.prop(self, "chunk_frames")
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scene = context.scene
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total = scene.frame_end - scene.frame_start + 1
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layout.separator()
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layout.label(text=f"Frames: {scene.frame_start} – {scene.frame_end} ({total} total)")
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layout.label(text=f"Playlist: {len(scene.knot_list)} knots")
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if self.chunk_frames > 0:
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n_chunks = -(-total // self.chunk_frames) # ceil division
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layout.label(text=f"Will produce {n_chunks} file(s)",
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icon='FILE_BLEND')
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else:
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layout.label(text="Single file (no splitting)", icon='FILE_BLEND')
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Reference in New Issue
Block a user