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10_mocap.py
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10_mocap.py
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# blender --background --python 10_mocap.py --render-frame 1 -- </path/to/input/bvh> </path/to/output/directory>/<name> <resolution_percentage> <num_samples>
# ffmpeg -r 24 -i </path/to/output/directory>/<name>%04d.png -pix_fmt yuv420p out.mp4
import bpy
import sys
import math
import os
working_dir_path = os.path.dirname(os.path.abspath(__file__))
sys.path.append(working_dir_path)
import utils
# Define paths for the PBR textures used in this scene
texture_paths = {
"Concrete07": {
"ambient_occlusion": os.path.join(working_dir_path, "assets/cc0textures.com/[2K]Concrete07/Concrete07_AO.jpg"),
"color": os.path.join(working_dir_path, "assets/cc0textures.com/[2K]Concrete07/Concrete07_col.jpg"),
"displacement": os.path.join(working_dir_path, "assets/cc0textures.com/[2K]Concrete07/Concrete07_disp.jpg"),
"metallic": "",
"normal": os.path.join(working_dir_path, "assets/cc0textures.com/[2K]Concrete07/Concrete07_nrm.jpg"),
"roughness": os.path.join(working_dir_path, "assets/cc0textures.com/[2K]Concrete07/Concrete07_rgh.jpg"),
}
}
def add_named_material(name: str, scale=(1.0, 1.0, 1.0), displacement_scale: float = 1.0) -> bpy.types.Material:
mat = utils.add_material(name, use_nodes=True, make_node_tree_empty=True)
utils.build_pbr_textured_nodes(mat.node_tree,
color_texture_path=texture_paths[name]["color"],
roughness_texture_path=texture_paths[name]["roughness"],
normal_texture_path=texture_paths[name]["normal"],
metallic_texture_path=texture_paths[name]["metallic"],
displacement_texture_path=texture_paths[name]["displacement"],
ambient_occlusion_texture_path=texture_paths[name]["ambient_occlusion"],
scale=scale,
displacement_scale=displacement_scale)
return mat
def create_armature_from_bvh(bvh_path: str) -> bpy.types.Object:
global_scale = 0.056444 # This value needs to be changed depending on the motion data
bpy.ops.import_anim.bvh(filepath=bvh_path,
axis_forward='-Z',
axis_up='Y',
target='ARMATURE',
global_scale=global_scale,
frame_start=1,
use_fps_scale=True,
update_scene_fps=False,
update_scene_duration=True)
armature = bpy.context.object
return armature
def build_scene(scene: bpy.types.Scene, input_bvh_path: str) -> bpy.types.Object:
# Build a concrete material for the floor and the wall
add_named_material("Concrete07", scale=(0.25, 0.25, 0.25))
# Build a metal material for the humanoid body
mat = utils.add_material("BlueMetal", use_nodes=True, make_node_tree_empty=True)
output_node = mat.node_tree.nodes.new(type='ShaderNodeOutputMaterial')
principled_node = mat.node_tree.nodes.new(type='ShaderNodeBsdfPrincipled')
principled_node.inputs['Base Color'].default_value = (0.1, 0.2, 0.7, 1.0)
principled_node.inputs['Metallic'].default_value = 0.9
principled_node.inputs['Roughness'].default_value = 0.1
mat.node_tree.links.new(principled_node.outputs['BSDF'], output_node.inputs['Surface'])
utils.arrange_nodes(mat.node_tree)
# Import the motion file and create a humanoid object
armature = create_armature_from_bvh(bvh_path=input_bvh_path)
armature_mesh = utils.create_armature_mesh(scene, armature, 'Mesh')
armature_mesh.data.materials.append(mat)
# Create a floor object
current_object = utils.create_plane(size=16.0, name="Floor")
current_object.data.materials.append(bpy.data.materials["Concrete07"])
# Create a wall object
current_object = utils.create_plane(size=16.0, name="Wall")
current_object.data.materials.append(bpy.data.materials["Concrete07"])
current_object.location = (0.0, 6.0, 0.0)
current_object.rotation_euler = (0.5 * math.pi, 0.0, 0.0)
# Create a target object for camera work
bpy.ops.object.empty_add(location=(0.0, 0.0, 0.8))
focus_target = bpy.context.object
utils.add_copy_location_constraint(copy_to_object=focus_target,
copy_from_object=armature,
use_x=True,
use_y=True,
use_z=False,
bone_name='Hips')
return focus_target
# Args
input_bvh_path = str(sys.argv[sys.argv.index('--') + 1]) # "./assets/motion/102_01.bvh"
output_file_path = bpy.path.relpath(str(sys.argv[sys.argv.index('--') + 2])) # "./out/frame_"
resolution_percentage = int(sys.argv[sys.argv.index('--') + 3]) # 100
num_samples = int(sys.argv[sys.argv.index('--') + 4]) # 128
# Parameters
hdri_path = os.path.join(working_dir_path, "assets/HDRIs/green_point_park_2k.hdr")
# Scene Building
scene = bpy.data.scenes["Scene"]
world = scene.world
## Reset
utils.clean_objects()
# Animation Setting
utils.set_animation(scene, fps=24, frame_start=1, frame_end=40) # frame_end will be overriden later
## Scene
focus_target_object = build_scene(scene, input_bvh_path)
## Camera
camera_object = utils.create_camera(location=(0.0, -10.0, 1.0))
utils.add_copy_location_constraint(copy_to_object=camera_object,
copy_from_object=focus_target_object,
use_x=True,
use_y=False,
use_z=False)
utils.add_track_to_constraint(camera_object, focus_target_object)
utils.set_camera_params(camera_object.data, focus_target_object)
## Lights
utils.build_environment_texture_background(world, hdri_path)
## Composition
utils.build_scene_composition(scene)
# Render Setting
utils.set_output_properties(scene, resolution_percentage, output_file_path)
utils.set_cycles_renderer(scene, camera_object, num_samples, use_motion_blur=True, use_adaptive_sampling=True)