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physics.py
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# Copyright (C) 2021 Victor Soupday
# This file is part of CC/iC Blender Tools <https://github.com/soupday/cc_blender_tools>
#
# CC/iC Blender Tools is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# CC/iC Blender Tools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with CC/iC Blender Tools. If not, see <https://www.gnu.org/licenses/>.
import math
import os
import mathutils
import bpy
from . import geom, bones, imageutils, meshutils, materials, modifiers, utils, jsonutils, vars
COLLISION_THICKESS = 0.001
HAIR_THICKNESS = 0.001
CLOTH_THICKNESS = 0.004
def apply_cloth_settings(obj, cloth_type, self_collision = False):
props = vars.props()
prefs = vars.prefs()
mod = modifiers.get_cloth_physics_mod(obj)
if mod is None:
return
obj_cache = props.get_object_cache(obj)
obj_cache.cloth_settings = cloth_type
utils.log_info("Setting " + obj.name + " cloth settings to: " + cloth_type)
mod.settings.vertex_group_mass = prefs.physics_group + "_Pin"
mod.settings.time_scale = 1
mod.collision_settings.use_self_collision = self_collision
cloth_area = geom.get_area(obj)
air_dampening_mod = cloth_area / 2.0
utils.log_info(f"Using cloth area: {cloth_area} sqm, air dampening mod: {air_dampening_mod}")
BASE_GSM = 1.0 / 2666
if cloth_type == "HAIR":
mod.settings.quality = 6
mod.settings.pin_stiffness = 0.025
# physical properties
mod.settings.mass = 0.05
mod.settings.air_damping = 1.0
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 5.0
mod.settings.compression_stiffness = 5.0
mod.settings.shear_stiffness = 5.0
mod.settings.bending_stiffness = 5.0
# dampening
mod.settings.tension_damping = 0.0
mod.settings.compression_damping = 0.0
mod.settings.shear_damping = 0.0
mod.settings.bending_damping = 0.0
# collision
mod.collision_settings.distance_min = HAIR_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0005 # 0.5mm
mod.collision_settings.self_friction = 1.0
elif cloth_type == "DENIM":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.5
# physical properties
mod.settings.mass = 400 * BASE_GSM
mod.settings.air_damping = 1.0 + 0.35 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 40.0
mod.settings.compression_stiffness = 40.0
mod.settings.shear_stiffness = 40.0
mod.settings.bending_stiffness = 60.0
# dampening
mod.settings.tension_damping = 25.0
mod.settings.compression_damping = 25.0
mod.settings.shear_damping = 25.0
mod.settings.bending_damping = 10.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.005 # 5mm
mod.collision_settings.self_friction = 10.0
elif cloth_type == "LEATHER":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.5
# physical properties
mod.settings.mass = 800 * BASE_GSM
mod.settings.air_damping = 1.0 + 0.25 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 80.0
mod.settings.compression_stiffness = 80.0
mod.settings.shear_stiffness = 80.0
mod.settings.bending_stiffness = 80.0
# dampening
mod.settings.tension_damping = 25.0
mod.settings.compression_damping = 25.0
mod.settings.shear_damping = 25.0
mod.settings.bending_damping = 10.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0025 # 5mm
mod.collision_settings.self_friction = 15.0
elif cloth_type == "RUBBER":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.25
# physical properties
mod.settings.mass = 650 * BASE_GSM
mod.settings.air_damping = 1.0 + 0.25 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 15.0
mod.settings.compression_stiffness = 15.0
mod.settings.shear_stiffness = 15.0
mod.settings.bending_stiffness = 40.0
# dampening
mod.settings.tension_damping = 25.0
mod.settings.compression_damping = 25.0
mod.settings.shear_damping = 25.0
mod.settings.bending_damping = 0.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0025 # 2.5mm
mod.collision_settings.self_friction = 20.0
elif cloth_type == "LINEN":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.1
# physical properties
mod.settings.mass = 160 * BASE_GSM
mod.settings.air_damping = 1.0 + 0.5 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 5.0
mod.settings.compression_stiffness = 5.0
mod.settings.shear_stiffness = 5.0
mod.settings.bending_stiffness = 20.0
# dampening
mod.settings.tension_damping = 5.0
mod.settings.compression_damping = 5.0
mod.settings.shear_damping = 5.0
mod.settings.bending_damping = 0.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0025 # 2.5mm
mod.collision_settings.self_friction = 5.0
elif cloth_type == "COTTON":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.075
# physical properties
mod.settings.mass = 140 * BASE_GSM
mod.settings.air_damping = 1.0 + 0.75 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 2.0
mod.settings.compression_stiffness = 2.0
mod.settings.shear_stiffness = 2.0
mod.settings.bending_stiffness = 10.0
# dampening
mod.settings.tension_damping = 2.0
mod.settings.compression_damping = 2.0
mod.settings.shear_damping = 2.0
mod.settings.bending_damping = 0.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0025 # 2.5mm
mod.collision_settings.self_friction = 5.0
elif cloth_type == "SILK":
mod.settings.quality = 8
mod.settings.pin_stiffness = 0.05
# physical properties
mod.settings.mass = 120 * BASE_GSM
mod.settings.air_damping = 1.0 + 1.0 * air_dampening_mod
mod.settings.bending_model = 'ANGULAR'
# stiffness
mod.settings.tension_stiffness = 0.5
mod.settings.compression_stiffness = 0.5
mod.settings.shear_stiffness = 0.5
mod.settings.bending_stiffness = 1.0
# dampening
mod.settings.tension_damping = 0.0
mod.settings.compression_damping = 0.0
mod.settings.shear_damping = 0.0
mod.settings.bending_damping = 0.0
# collision
mod.collision_settings.distance_min = CLOTH_THICKNESS
mod.collision_settings.collision_quality = 4
mod.collision_settings.self_distance_min = 0.0025 # 2.5mm
mod.collision_settings.self_friction = 1.0
def uses_collision_physics(chr_cache, obj):
obj_cache = chr_cache.get_object_cache(obj)
collision_setting = "OFF"
if obj == obj_cache.get_object():
collision_setting = obj_cache.collision_physics
if "rl_collision_physics" in obj:
collision_setting = obj["rl_collision_physics"]
if collision_setting == "ON" or collision_setting == "PROXY":
return True
# Body objects should use collision physics by default
if collision_setting == "DEFAULT" and \
(obj_cache.object_type == "BODY" or obj_cache.object_type == "OCCLUSION"):
return True
return False
def apply_collision_physics(chr_cache, obj, obj_cache):
"""Adds a Collision modifier to the object, depending on the object cache settings.
Does not overwrite or re-create any existing Collision modifier.
"""
if not (chr_cache and obj and obj_cache):
return
# physics seem to apply better if done in rest pose
arm = chr_cache.get_armature()
if arm:
pose_position = arm.data.pose_position
arm.data.pose_position = "REST"
has_cloth = modifiers.get_cloth_physics_mod(obj) is not None
if uses_collision_physics(chr_cache, obj):
if obj_cache.use_collision_proxy and not has_cloth:
proxy = chr_cache.get_collision_proxy(obj)
if not proxy:
proxy = create_collision_proxy(chr_cache, obj_cache, obj)
if proxy:
obj = proxy
else:
remove_collision_proxy(chr_cache, obj)
collision_mod = modifiers.get_collision_physics_mod(obj)
if not collision_mod:
collision_mod = obj.modifiers.new(utils.unique_name("Collision"), type="COLLISION")
collision_mod.settings.thickness_outer = COLLISION_THICKESS
utils.log_info("Collision Modifier: " + collision_mod.name + " applied to " + obj.name)
elif obj_cache.collision_physics == "OFF":
remove_collision_physics(chr_cache, obj)
utils.log_info("Collision Physics disabled for: " + obj.name)
if arm:
arm.data.pose_position = pose_position
def remove_collision_physics(chr_cache, obj):
"""Removes the Collision modifier from the object.
"""
if chr_cache and obj:
proxy = chr_cache.get_collision_proxy(obj)
if proxy:
utils.delete_mesh_object(proxy)
for mod in obj.modifiers:
if mod.type == "COLLISION":
utils.log_info("Removing Collision modifer: " + mod.name + " from: " + obj.name)
obj.modifiers.remove(mod)
def add_cloth_physics(chr_cache, obj, add_weight_maps = False):
"""Adds a Cloth modifier to the object depending on the object cache settings.
Does not overwrite or re-create any existing Cloth modifier.
Sets the cache bake range to the same as any action on the character's armature.
Applies cloth settings based on the object cache settings.
Repopulates the existing weight maps, depending on their cache settings.
"""
prefs = vars.prefs()
props = vars.props()
if not (chr_cache and obj):
return
obj_cache = chr_cache.get_object_cache(obj)
if (obj_cache and
obj_cache.cloth_physics == "ON"):
utils.object_mode_to(obj)
# Add weight maps
if add_weight_maps:
for mat in obj.data.materials:
if mat:
add_material_weight_map(chr_cache, obj, mat, create = False)
if modifiers.has_cloth_weight_map_mods(obj):
attach_cloth_weight_map_remap(obj, prefs.physics_weightmap_curve)
cloth_mod = modifiers.get_cloth_physics_mod(obj)
if not cloth_mod:
# Create the Cloth modifier
cloth_mod : bpy.types.ClothModifier
cloth_mod_id = utils.unique_name("Cloth")
cloth_mod = obj.modifiers.new(cloth_mod_id, type="CLOTH")
utils.log_info("Cloth Modifier: " + cloth_mod.name + " applied to " + obj.name)
# Set cache bake frame range
frame_start, frame_end = utils.get_scene_frame_range()
utils.log_info(f"Setting {obj.name} bake cache frame range to [{str(frame_start)} - {str(frame_end)}]")
cloth_mod.point_cache.frame_start = frame_start
cloth_mod.point_cache.frame_end = frame_end
if not cloth_mod.point_cache.name:
random_id = utils.generate_random_id(10)
cache_id = f"{obj.name}_{random_id}"
cloth_mod.point_cache.name = cache_id
# Apply cloth settings
if obj_cache.cloth_settings != "DEFAULT":
apply_cloth_settings(obj,
obj_cache.cloth_settings,
self_collision = obj_cache.cloth_self_collision)
elif obj_cache.object_type == "HAIR":
apply_cloth_settings(obj, "HAIR")
else:
apply_cloth_settings(obj, "COTTON")
# fix mod order
arrange_physics_modifiers(obj)
elif obj_cache.cloth_physics == "OFF":
utils.log_info("Cloth Physics disabled for: " + obj.name)
def remove_cloth_physics(obj):
"""Removes the Cloth modifier from the object.
Also removes any active weight maps and also removes the weight map vertex group.
"""
if not obj:
return
prefs = vars.prefs()
utils.object_mode_to(obj)
# Remove the Cloth modifier
for mod in obj.modifiers:
if mod.type == "CLOTH":
utils.log_info("Removing Cloth modifer: " + mod.name + " from: " + obj.name)
obj.modifiers.remove(mod)
# Remove any weight maps
for mat in obj.data.materials:
if mat:
remove_material_weight_maps(obj, mat)
weight_group = prefs.physics_group + "_" + utils.strip_name(mat.name)
if weight_group in obj.vertex_groups:
obj.vertex_groups.remove(obj.vertex_groups[weight_group])
remove_cloth_weight_map_remap(obj)
# If there are no weight maps left on the object, remove the vertex group
mods = 0
for mod in obj.modifiers:
if mod.type == "VERTEX_WEIGHT_EDIT" and vars.NODE_PREFIX in mod.name:
mods += 1
pin_group = prefs.physics_group + "_Pin"
if mods == 0 and pin_group in obj.vertex_groups:
utils.log_info("Removing vertex group: " + pin_group + " from: " + obj.name)
obj.vertex_groups.remove(obj.vertex_groups[pin_group])
def remove_all_physics_mods(obj):
"""Removes all physics modifiers from the object.
Used when (re)building the character materials.
"""
utils.log_info("Removing all related physics modifiers from: " + obj.name)
for mod in obj.modifiers:
if mod.type == "VERTEX_WEIGHT_EDIT" and vars.NODE_PREFIX in mod.name:
obj.modifiers.remove(mod)
elif mod.type == "VERTEX_WEIGHT_MIX" and vars.NODE_PREFIX in mod.name:
obj.modifiers.remove(mod)
elif mod.type == "CLOTH":
obj.modifiers.remove(mod)
elif mod.type == "COLLISION":
obj.modifiers.remove(mod)
def enable_collision_physics(chr_cache, obj):
props = vars.props()
if chr_cache and utils.object_exists_is_mesh(obj):
obj, proxy, is_proxy = chr_cache.get_related_physics_objects(obj)
obj_cache = chr_cache.get_object_cache(obj)
if obj_cache:
has_cloth = modifiers.get_cloth_physics_mod(obj) is not None
collision_mode = "PROXY" if (obj_cache.use_collision_proxy and not has_cloth) else "ON"
if obj == obj_cache.get_object():
obj_cache.collision_physics = collision_mode
obj["rl_collision_physics"] = collision_mode
utils.log_info("Enabling Collision physics for: " + obj.name)
apply_collision_physics(chr_cache, obj, obj_cache)
def disable_collision_physics(chr_cache, obj):
if chr_cache and utils.object_exists_is_mesh(obj):
obj, proxy, is_proxy = chr_cache.get_related_physics_objects(obj)
obj_cache = chr_cache.get_object_cache(obj)
if obj_cache:
if obj == obj_cache.get_object():
obj_cache.collision_physics = "OFF"
obj["rl_collision_physics"] = "OFF"
utils.log_info("Disabling Collision physics for: " + obj.name)
remove_collision_physics(chr_cache, obj)
def show_hide_collision_proxies(context, chr_cache, show, select=False, use_local=False):
if chr_cache:
objects = []
proxies = []
# get all character objects with proxies
for obj in chr_cache.get_cache_objects():
obj, proxy, is_proxy = chr_cache.get_related_physics_objects(obj)
if obj and proxy:
objects.append(obj)
proxies.append(proxy)
# show / hide all proxy objects
if show:
if proxies:
for proxy in proxies:
utils.unhide(proxy)
utils.object_mode()
if select or use_local:
utils.try_select_objects(proxies, clear_selection=True)
if use_local and not utils.is_local_view(context):
bpy.ops.view3d.localview()
return True
else:
if proxies:
for proxy in proxies:
utils.hide(proxy)
utils.object_mode()
if select:
utils.try_select_objects(objects, clear_selection=True)
if use_local and utils.is_local_view(context):
bpy.ops.view3d.localview()
return False
def enable_cloth_physics(chr_cache, obj, add_weight_maps = True):
props = vars.props()
if chr_cache and obj:
obj_cache = chr_cache.get_object_cache(obj)
if obj_cache:
obj_cache.cloth_physics = "ON"
utils.log_info("Enabling Cloth physics for: " + obj.name)
add_cloth_physics(chr_cache, obj, add_weight_maps)
def disable_cloth_physics(chr_cache, obj):
props = vars.props()
if chr_cache and obj:
obj_cache = chr_cache.get_object_cache(obj)
if obj_cache:
obj_cache.cloth_physics = "OFF"
utils.log_info("Removing cloth physics for: " + obj.name)
remove_cloth_physics(obj)
def remove_collision_proxy(chr_cache, obj):
proxy = chr_cache.get_collision_proxy(obj)
if proxy:
utils.log_info(f"Removing collision proxy: {proxy.name}")
utils.delete_mesh_object(proxy)
def create_collision_proxy(chr_cache, obj_cache, obj):
utils.log_info(f"Creating collision proxy mesh from: {obj.name}")
# remove old proxy
remove_collision_proxy(chr_cache, obj)
# clone obj to proxy
collision_proxy = utils.duplicate_object(obj)
collision_proxy.name = obj.name + ".Collision_Proxy"
collision_proxy["rl_collision_proxy"] = obj.name
if utils.object_mode_to(collision_proxy) and utils.set_only_active_object(collision_proxy):
# remove shape keys
collision_proxy.shape_key_clear()
# remove eye-lashes
eye_lash_mat = materials.get_material_by_type(chr_cache, collision_proxy, "EYELASH")
if eye_lash_mat:
meshutils.remove_material_verts(collision_proxy, eye_lash_mat)
# remove materials
collision_proxy.data.materials.clear()
# delete loose
utils.edit_mode_to(collision_proxy)
bpy.ops.mesh.select_all(action="SELECT")
bpy.ops.mesh.delete_loose(use_verts=True, use_edges=True, use_faces=True)
utils.object_mode_to(collision_proxy)
if obj_cache.collision_proxy_decimate < 1.0:
# add decimate modifier
mod = modifiers.add_decimate_modifier(collision_proxy,
obj_cache.collision_proxy_decimate,
"Decimate_Collision_Body")
modifiers.move_mod_first(collision_proxy, mod)
# apply decimate modifier
bpy.ops.object.modifier_apply(modifier=mod.name)
utils.log_info(f"Storing collision mesh: {collision_proxy.name}")
obj_cache.use_collision_proxy = True
obj_cache.collision_physics = "PROXY"
utils.hide(collision_proxy)
collision_proxy.hide_render = True
utils.set_only_active_object(obj)
return collision_proxy
def get_weight_map_from_modifiers(obj, mat):
mat_name = "_" + utils.strip_name(mat.name) + "_"
if obj.type == "MESH":
for mod in obj.modifiers:
if mod.type == "VERTEX_WEIGHT_EDIT" and vars.NODE_PREFIX in mod.name and mat_name in mod.name:
if mod.mask_texture is not None and mod.mask_texture.image is not None:
image = mod.mask_texture.image
return image
return None
def get_weight_map_image(chr_cache, obj, mat, create = False):
"""Returns the weight map image for the material.
Fetches the Image for the given materials weight map, if it exists.
If not, the image can be created and packed into the blend file and stored
in the material cache as a temporary weight map image.
"""
props = vars.props()
mat_cache = props.get_material_cache(mat)
weight_map = imageutils.find_material_image(mat, "WEIGHTMAP")
if mat_cache:
if weight_map:
if weight_map.size[0] == 0 or weight_map.size[1] == 0:
weight_map = None
else:
mat_cache.temp_weight_map = weight_map
if weight_map is None and create:
name = utils.strip_name(mat.name) + "_WeightMap"
tex_size = int(props.physics_tex_size)
weight_map = bpy.data.images.new(name, tex_size, tex_size, is_data=False)
# make the image 'dirty' so it converts to a file based image which can be saved:
weight_map.pixels[0] = 0.0
weight_map.file_format = "PNG"
weight_map.filepath_raw = os.path.join(mat_cache.get_tex_dir(chr_cache), name + ".png")
weight_map.save()
# keep track of which weight maps we created:
mat_cache.temp_weight_map = weight_map
utils.log_info("Weight-map image: " + weight_map.name + " created and saved.")
return weight_map
def add_material_weight_map(chr_cache, obj, mat, create = False):
"""Adds a weight map 'Vertex Weight Edit' modifier for the object's material.
Gets or creates (if instructed) the material's weight map then creates
or re-creates the modifier to generate the physics 'Pin' vertex group.
"""
if chr_cache and obj and mat:
if cloth_physics_available(chr_cache, obj, mat):
if create:
weight_map = get_weight_map_image(chr_cache, obj, mat, create)
else:
weight_map = imageutils.find_material_image(mat, "WEIGHTMAP")
remove_material_weight_maps(obj, mat)
if weight_map is not None:
attach_material_weight_map(obj, mat, weight_map)
else:
utils.log_info("Cloth Physics has been disabled for: " + obj.name)
def remove_material_weight_maps(obj, mat):
"""Removes the weight map 'Vertex Weight Edit' modifier for the object's material.
This does not remove or delete the weight map image or temporary packed image,
or the texture based on the weight map image, just the modifier.
"""
if obj and mat:
edit_mod, mix_mod = modifiers.get_material_weight_map_mods(obj, mat)
if edit_mod is not None:
utils.log_info("Removing weight map vertex edit modifer: " + edit_mod.name)
obj.modifiers.remove(edit_mod)
if mix_mod is not None:
utils.log_info("Removing weight map vertex mix modifer: " + mix_mod.name)
obj.modifiers.remove(mix_mod)
def enable_material_weight_map(chr_cache, obj, mat):
"""Enables the weight map for the object's material and (re)creates the Vertex Weight Edit modifier.
"""
prefs = vars.prefs()
props = vars.props()
if chr_cache and obj and mat:
mat_cache = chr_cache.get_material_cache(mat)
if mat_cache:
if mat_cache.cloth_physics == "OFF":
mat_cache.cloth_physics = "ON"
add_material_weight_map(chr_cache, obj, mat, True)
if modifiers.has_cloth_weight_map_mods(obj):
attach_cloth_weight_map_remap(obj, prefs.physics_weightmap_curve)
# fix mod order
arrange_physics_modifiers(obj)
def disable_material_weight_map(chr_cache, obj, mat):
"""Disables the weight map for the object's material and removes the Vertex Weight Edit modifier.
"""
if chr_cache and obj and mat:
mat_cache = chr_cache.get_material_cache(mat)
mat_cache.cloth_physics = "OFF"
remove_material_weight_maps(obj, mat)
def collision_physics_available(chr_cache, obj):
"""Is cloth collisions physics allowed on the character object?"""
if chr_cache and obj:
obj_cache = chr_cache.get_object_cache(obj)
collision_mod = modifiers.get_collision_physics_mod(obj)
if collision_mod is None:
if obj_cache.collision_physics == "OFF":
return False
return True
return False
def cloth_physics_available(chr_cache, obj, mat):
"""Is cloth physics allowed on this character object and material?"""
if chr_cache and obj and mat:
obj_cache = chr_cache.get_object_cache(obj)
mat_cache = chr_cache.get_material_cache(mat)
cloth_mod = modifiers.get_cloth_physics_mod(obj)
if cloth_mod is None:
if obj_cache.cloth_physics == "OFF":
return False
if mat_cache is not None and mat_cache.cloth_physics == "OFF":
return False
else:
# if cloth physics was disabled by the add-on,
# but re-enabled in the physics panel,
# correct the object cache setting:
if obj_cache.cloth_physics == "OFF":
obj_cache.cloth_physics == "ON"
return True
return False
def is_cloth_physics_enabled(mat_cache, mat, obj):
"""Is cloth physics enabled on this character object and material?"""
if mat_cache and obj and mat:
cloth_mod = modifiers.get_cloth_physics_mod(obj)
edit_mods, mix_mods = modifiers.get_material_weight_map_mods(obj, mat)
if cloth_mod and edit_mods and mix_mods:
if mat_cache and mat_cache.cloth_physics != "OFF":
return True
return False
return False
def attach_cloth_weight_map_remap(obj, replace = True, curve_power = 5.0):
"""Attach the final remap vertex weight edit to convert the physx weight
map values to something more blender physics friendly."""
prefs = vars.prefs()
remap_mod : bpy.types.VertexWeightEditModifier
if replace:
modifiers.remove_object_modifiers(obj, "VERTEX_WEIGHT_EDIT", "_WeightEditRemap")
else:
remap_mod = modifiers.get_object_modifier(obj, "VERTEX_WEIGHT_EDIT", "_WeightEditRemap")
if remap_mod:
return
pin_group = prefs.physics_group + "_Pin"
obj_name = utils.safe_export_name(obj.name)
remap_mod = obj.modifiers.new(utils.unique_name(obj_name + "_WeightEditRemap"), "VERTEX_WEIGHT_EDIT")
remap_mod.use_add = False
remap_mod.use_remove = False
remap_mod.vertex_group = pin_group
remap_mod.default_weight = 0.0
remap_mod.falloff_type = 'CURVE'
remap_mod.invert_falloff = False
#remap_mod.map_curve.curves[0].points.new(0.25, pow(0.25, curve_power))
#remap_mod.map_curve.curves[0].points.new(0.5, pow(0.5, curve_power))
remap_mod.map_curve.curves[0].points.new(0.75, pow(0.75, curve_power))
remap_mod.map_curve.update()
def remove_cloth_weight_map_remap(obj):
modifiers.remove_object_modifiers(obj, "VERTEX_WEIGHT_EDIT", "_WeightEditRemap")
def attach_material_weight_map(obj, mat, weight_map):
"""Attaches a weight map to the object's material via a 'Vertex Weight Edit' modifier.
This will attach the supplied weight map or will try to find an existing weight map,
but will not create a new weight map if it doesn't already exist.
"""
prefs = vars.prefs()
if obj and mat and weight_map:
# Make a texture based on the weight map image
# As we are matching names to find existing textures,
# get a name that keeps the duplication suffix
mat_name = utils.safe_export_name(mat.name)
tex_name = mat_name + "_Weight"
tex = None
for t in bpy.data.textures:
if t.name.startswith(vars.NODE_PREFIX + tex_name):
tex = t
if tex is None:
tex = bpy.data.textures.new(utils.unique_name(tex_name), "IMAGE")
utils.log_info("Texture: " + tex.name + " created for weight map transfer")
else:
utils.log_info("Texture: " + tex.name + " already exists for weight map transfer")
tex.image = weight_map
# Create the physics pin vertex group and the material weightmap group if they don't exist:
pin_group = prefs.physics_group + "_Pin"
material_group = prefs.physics_group + "_" + mat_name
if pin_group not in obj.vertex_groups:
pin_vertex_group = obj.vertex_groups.new(name = pin_group)
else:
pin_vertex_group = obj.vertex_groups[pin_group]
if material_group not in obj.vertex_groups:
weight_vertex_group = obj.vertex_groups.new(name = material_group)
else:
weight_vertex_group = obj.vertex_groups[material_group]
# The material weight map group should contain only those vertices affected by the material, default weight to 1.0
meshutils.clear_vertex_group(obj, weight_vertex_group)
mat_vert_indices = meshutils.get_material_vertex_indices(obj, mat)
weight_vertex_group.add(mat_vert_indices, 1.0, 'ADD')
# The pin group should contain all vertices in the mesh default weighted to 1.0
meshutils.set_vertex_group(obj, pin_vertex_group, 1.0)
# set the pin group in the cloth physics modifier
mod_cloth = modifiers.get_cloth_physics_mod(obj)
if mod_cloth is not None:
mod_cloth.settings.vertex_group_mass = pin_group
# re-create create the Vertex Weight Edit modifier and the Vertex Weight Mix modifer
remove_material_weight_maps(obj, mat)
edit_mod : bpy.types.VertexWeightEditModifier
edit_mod = obj.modifiers.new(utils.unique_name(mat_name + "_WeightEdit"), "VERTEX_WEIGHT_EDIT")
mix_mod = obj.modifiers.new(utils.unique_name(mat_name + "_WeightMix"), "VERTEX_WEIGHT_MIX")
# Use the texture as the modifiers vertex weight source
edit_mod.mask_texture = tex
# Setup the modifier to generate the inverse of the weight map in the vertex group
edit_mod.use_add = False
edit_mod.use_remove = False
edit_mod.add_threshold = 0.01
edit_mod.remove_threshold = 0.01
edit_mod.vertex_group = material_group
edit_mod.default_weight = 1
edit_mod.falloff_type = 'LINEAR'
edit_mod.invert_falloff = True
edit_mod.mask_constant = 1
edit_mod.mask_tex_mapping = 'UV'
edit_mod.mask_tex_use_channel = 'INT'
try:
edit_mod.normalize = False
except:
pass
# The Vertex Weight Mix modifier takes the material weight map group and mixes it into the pin weight group:
# (this allows multiple weight maps from different materials and UV layouts to combine in the same mesh)
mix_mod.vertex_group_a = pin_group
mix_mod.vertex_group_b = material_group
mix_mod.invert_mask_vertex_group = True
mix_mod.default_weight_a = 1
mix_mod.default_weight_b = 1
mix_mod.mix_set = 'B' #'ALL'
mix_mod.mix_mode = 'SET'
mix_mod.invert_mask_vertex_group = False
utils.log_info("Weight map: " + weight_map.name + " applied to: " + obj.name + "/" + mat.name)
def get_physx_weight_range(obj):
"""Get the range (min, max) of weights for physics pin group"""
props = vars.props()
prefs = vars.prefs()
weight_min = 1.0
weight_max = 0.0
if obj:
vertex_group_name = prefs.physics_group + "_Pin"
if obj.type == "MESH" and vertex_group_name in obj.vertex_groups:
if utils.set_active_object(obj):
# normalize pin vertex group range
pin_vg = obj.vertex_groups[vertex_group_name]
pin_vg_index = pin_vg.index
# determine range
for vertex in obj.data.vertices:
for vg in vertex.groups:
if vg.group == pin_vg_index:
w = vg.weight
weight_min = min(w, weight_min)
weight_max = max(w, weight_max)
return weight_min, weight_max
def count_weightmaps(objects):
num_maps = 0
num_dirty = 0
for obj in objects:
if obj.type == "MESH":
for mod in obj.modifiers:
if mod.type == "VERTEX_WEIGHT_EDIT" and vars.NODE_PREFIX in mod.name:
if mod.mask_texture is not None and mod.mask_texture.image is not None:
num_maps += 1
image = mod.mask_texture.image
if image.is_dirty:
num_dirty += 1
return num_maps, num_dirty
def get_dirty_weightmaps(objects):
maps = []
for obj in objects:
if obj.type == "MESH":
for mod in obj.modifiers:
if mod.type == "VERTEX_WEIGHT_EDIT" and vars.NODE_PREFIX in mod.name:
if mod.mask_texture is not None and mod.mask_texture.image is not None:
image = mod.mask_texture.image
abs_image_path = bpy.path.abspath(image.filepath)
if image.filepath != "" and (image.is_dirty or not os.path.exists(abs_image_path)):
maps.append(image)
return maps
def physics_paint_strength_update(self, context):
props = vars.props()
if context.mode == "PAINT_TEXTURE":
ups = context.tool_settings.unified_paint_settings
prop_owner = ups if ups.use_unified_color else context.tool_settings.image_paint.brush
s = props.physics_paint_strength
prop_owner.color = (s, s, s)
def weight_strength_update(self, context):
props = vars.props()
strength = props.weight_map_strength
influence = 1 - math.pow(1 - strength, 3)
edit_mod, mix_mod = modifiers.get_material_weight_map_mods(context.object, utils.get_context_material(context))
mix_mod.mask_constant = influence
def browse_weight_map(chr_cache, context):
obj = context.object
mat = utils.get_context_material(context)
if obj and mat:
weight_map = get_weight_map_image(chr_cache, obj, mat)
if weight_map:
path = bpy.path.abspath(weight_map.filepath)
utils.show_system_file_browser(path)
def begin_paint_weight_map(context, chr_cache):
obj = context.object
mat = utils.get_context_material(context)
props = vars.props()
shading = utils.get_view_3d_shading(context)
if obj is not None and mat is not None:
if shading:
props.paint_store_render = shading.type
else:
props.paint_store_render = "MATERIAL"
if context.mode != "PAINT_TEXTURE":
bpy.ops.object.mode_set(mode="TEXTURE_PAINT")
if context.mode == "PAINT_TEXTURE":
physics_paint_strength_update(None, context)
weight_map = get_weight_map_image(chr_cache, obj, mat)
weight_map.update()
props.paint_object = obj
props.paint_material = mat
props.paint_image = weight_map
shading = utils.get_view_3d_shading(context)
if weight_map is not None:
bpy.context.scene.tool_settings.image_paint.mode = 'IMAGE'
bpy.context.scene.tool_settings.image_paint.canvas = weight_map
if shading:
shading.type = 'SOLID'
def resize_weight_map(chr_cache, context, op):
props = vars.props()
if context.mode == "PAINT_TEXTURE":
return
obj = context.object
mat = utils.get_context_material(context)
props = vars.props()
if obj is not None and mat is not None:
weight_map : bpy.types.Image = get_weight_map_image(chr_cache, obj, mat)
size = int(props.physics_tex_size)
if weight_map and (weight_map.size[0] != size or weight_map.size[1] != size):
weight_map.scale(size, size)
# force Blender to update the image by changing a pixel value
# otherwise it doesn't recognise the size change.
value = weight_map.pixels[0]
weight_map.pixels[0] = 0.0
weight_map.pixels[0] = value
weight_map.update()
op.report({'INFO'}, f"Weightmap Resized to: {size} x {size}")
def end_paint_weight_map(op, context, chr_cache):
try:
props = vars.props()
shading = utils.get_view_3d_shading(context)
if context.mode != "OBJECT":
bpy.ops.object.mode_set(mode="OBJECT")
if shading:
shading.type = props.paint_store_render
#props.paint_image.save()
op.report({'INFO'}, f"Weightmap painting done, Save the weightmap to preserve changes.")
except Exception as e:
utils.log_error("Something went wrong restoring object mode from paint mode!", e)
def save_dirty_weight_maps(chr_cache, objects):
"""Saves all altered active weight map images to their respective material folders.
Also saves any missing weight maps.
"""
maps = get_dirty_weightmaps(objects)
for weight_map in maps:
if weight_map.is_dirty:
utils.log_info("Dirty weight map: " + weight_map.name + " : " + weight_map.filepath)
weight_map.save()
utils.log_info("Weight Map: " + weight_map.name + " saved to: " + weight_map.filepath)
if not os.path.exists(weight_map.filepath):
utils.log_info("Missing weight map: " + weight_map.name + " : " + weight_map.filepath)
weight_map.save()