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blender.py
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blender.py
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# blender experimental
# run with:
# blender myscene.blend --background --python myscript.py
# blender -b -P myscript.py
import bpy
import math
import mathutils
import numpy as np
import subprocess
import json
C = bpy.context
D = bpy.data
def clear_scene():
for o in C.scene.objects:
print(o)
if o.type == 'MESH':
o.select_set(True)
else:
o.select_set(False)
bpy.ops.object.delete()
def render(path, file_format='PNG', color_mode='RGBA'):
"""
:path: the file path of the rendered image
:file_format: {PNG, JPEG}
"""
C.scene.render.image_settings.file_format=file_format
C.scene.render.filepath = path
# C.scene.view_settings.view_transform = 'Standard'
# D.worlds["World"].node_tree.nodes["Background"].inputs[0].default_value = (1, 1, 1, 1)
# bpy.context.scene.world.use_nodes = False
# bpy.context.scene.world.color = (1, 1, 1)
# C.scene.render.alpha_mode = 'SKY'
bpy.ops.render.render(use_viewport=True, write_still=True)
def save_blender_scene(path):
bpy.ops.wm.save_as_mainfile(filepath=f'/Users/francis/Programming/PyViz3D/{path}')
def compute_object_center(object):
local_bbox_center = 0.125 * sum((mathutils.Vector(b) for b in object.bound_box),
mathutils.Vector())
return object.matrix_world @ local_bbox_center
def look_at(camera,
eye=mathutils.Vector((13.0, 13.0, 13.0)),
at=mathutils.Vector((0.0, 0.0, 3.0)),
up=mathutils.Vector((0.0, 0.0, 1.0))):
d = (eye - at).normalized()
r = up.cross(d).normalized()
u = d.cross(r).normalized()
camera.matrix_world = mathutils.Matrix(((r.x, u.x, d.x, eye.x),
(r.y, u.y, d.y, eye.y),
(r.z, u.z, d.z, eye.z),
(0.0, 0.0, 0.0, 1.0)))
def create_video(input_dir, pattern, output_filepath):
trans_to_white = "format=yuva444p,\
geq=\
'if(lte(alpha(X,Y),16),255,p(X,Y))':\
'if(lte(alpha(X,Y),16),128,p(X,Y))':\
'if(lte(alpha(X,Y),16),128,p(X,Y))'"
# f = "color=white,format=rgb24[c];[c][0]scale2ref[c][i];[c][i]overlay=format=auto:shortest=1,setsar=1"
# cmd = ["ffmpeg", "-i", pattern, '-filter_complex', f, '-y', output_filepath]
# subprocess.run(cmd)
import glob
for fi in glob.glob(f'{input_dir}/output_*.png'):
subprocess.run(["convert", "-flatten", fi, fi])
# subprocess.run(["convert", fi, "-background", "white", "-alpha", "remove", "-flatten", "-alpha", "off", fi])
# subprocess.run(["ffmpeg", "-i", pattern, '-y', output_filepath])
subprocess.run(["ffmpeg", "-i", f'{input_dir}/{pattern}', "-vcodec", "libx264", "-vf", "format=yuv420p", "-y", output_filepath])
# subprocess.run(["convert", "-delay", "1", "-loop", "0", "*.png", "myimage.gif"])
def init_scene():
# render stuff
C.scene.render.resolution_x = 16 * 40
C.scene.render.resolution_y = 9 * 40
D.scenes["Scene"].render.film_transparent = True
C.scene.render.image_settings.color_mode = 'RGBA'
C.scene.view_settings.look = 'AgX - Medium High Contrast'
C.scene.render.engine = 'CYCLES'
C.scene.cycles.device = 'GPU'
C.scene.cycles.preview_samples = 100
C.scene.cycles.samples = 150
C.scene.frame_end = 60
# lights
C.scene.objects['Light'].data.shadow_soft_size = 1.0
bpy.ops.object.light_add(type='POINT', radius=1, align='WORLD', location=(1, 1, 0), scale=(1, 1, 1))
C.scene.objects['Point'].data.energy = 100.0
def main(scene_name, layer_name):
clear_scene()
init_scene()
# bpy.ops.import_mesh.ply(filepath='examples/data/scene0106_02_vh_clean_2.ply')
prefix = f'example_scenes/{scene_name}'
bpy.ops.import_mesh.ply(filepath=f'{prefix}/{scene_name}.ply')
obj = bpy.data.objects[scene_name]
# loops = len(obj.data.loops)
# verts = len(obj.data.vertices)
# print(loops, verts, len(obj.data.vertex_colors['Col'].data))
# Read vertex colors
path_json = f'{prefix}/nodes.json'
with open(path_json) as f:
j = json.load(f)
name = layer_name # Color
num_points = j[name]['num_points']
binary_filename = j[name]['binary_filename']
path_pointcloud = f'{prefix}/{binary_filename}'
try:
with open(path_pointcloud, 'rb') as f:
data = f.read()
except:
print(f'Could not read: {path_pointcloud}')
colors = data[24 * num_points:]
print(len(colors))
# try:
for i, d in enumerate(obj.data.vertex_colors['Col'].data):
vertex_index = obj.data.loops[i].vertex_index
for j in [0, 1, 2]:
d.color[j] = float(colors[vertex_index * 3 + j]) / 255.0
# except:
# print(f'{name} not found: {path_pointcloud}')
# look into each loop's vertex ? (need to filter out double entries)
# visit = verts * [False]
# colors = {}
# for l in range(loops):
# v = obj.data.loops[l].vertex_index
# c = vcol.data[l].color
# if not visit[v]:
# colors[v] = c
# visit[v] = True
# sorted(colors)
# print("Vertex-Colors of Layer:", vcol.name)
# #print(colors)
# for v, c in colors.items():
# print("Vertex {0} has Color {1}".format(v, (c[0], c[1], c[2])))
# bpy.ops.material.new()
# bpy.data.materials["Material.001"].use_backface_culling = True
# bpy.ops.object.mode_set(mode='VERTEX_PAINT')
def create_mat(obj):
mat = bpy.data.materials.new(name="test")
mat.use_backface_culling = True
obj.data.materials.append(mat)
mat.use_nodes = True
mat.node_tree.nodes.new(type="ShaderNodeVertexColor")
mat.node_tree.nodes["Color Attribute"].layer_name = "Col"
mat.node_tree.links.new(
mat.node_tree.nodes["Principled BSDF"].inputs["Base Color"],
mat.node_tree.nodes["Color Attribute"].outputs["Color"])
mat.node_tree.nodes["Principled BSDF"].inputs[7].default_value = 0 # specular
create_mat(obj)
print(f'{prefix}/{name}.blend')
save_blender_scene(path=f'{prefix}/{name}.blend')
exit()
for i in range(0, 2):
a = i * 2 / 180.0 * math.pi
radius = 2.0
camera_position=mathutils.Vector(
(math.cos(a) * radius, math.sin(a) * radius, 1.0 ))
scene_center=compute_object_center(obj)
scene_center.z = -0.3
camera_position += scene_center
look_at(D.objects['Camera'],
eye=camera_position,
at=scene_center)
render(path=f'{prefix}/frames/output_{str(i).zfill(5)}', file_format='PNG')
create_video(f'{prefix}/frames', 'output_%05d.png', f"{prefix}/{scene_name}_{name}.mp4")
if __name__ == "__main__":
main(scene_name="cnb_103",
layer_name="InstancesAll") # Color, InstanceAll
# matg = bpy.data.materials.new("Green")
# matg.diffuse_color = (0,1,0,0.8)
# obj.active_material = matg
# obj.vertex_colors.new(name=vertex_colors_name)
# color_layer = mesh.vertex_colors[vertex_colors_name]
# print(len(obj.data.vertices))
# loops = len(obj.data.loops)
# verts = len(obj.data.vertices)
# print(loops, verts, len(obj.data.vertex_colors['Col'].data))
# Read vertex colors
# name = 'PointClouds;1' # Color
# num_points = j[name]['num_points']
# print(num_points)
# binary_filename = j[name]['binary_filename']
# path_pointcloud = f'{binary_filename}'
# try:
# with open(path_pointcloud, 'rb') as f:
# data = f.read()
# except:
# print(f'Could not read: {path_pointcloud}')
# points = data[:12 * num_points]
# normals = data[12 * num_points:24 * num_points]
# colors = data[24 * num_points:]
# points = np.frombuffer(data[:12 * num_points], np.float32).reshape([-1, 3])
# colors = np.frombuffer(data[24 * num_points:], np.uint8).reshape([-1, 3])
# for i in range(num_points):
# bpy.ops.mesh.primitive_uv_sphere_add(segments=5,
# ring_count=5,
# radius=0.1,
# enter_editmode=False,
# location=points[i])
# try:
# for i, d in enumerate(obj.data.vertex_colors['Col'].data):
# vertex_index = obj.data.loops[i].vertex_index
# for j in [0, 1, 2]:
# d.color[j] = float(colors[vertex_index * 3 + j]) / 255.0
# except:
# print(f'{name} not found: {path_pointcloud}')
# look into each loop's vertex ? (need to filter out double entries)
# visit = verts * [False]
# colors = {}
# for l in range(loops):
# v = obj.data.loops[l].vertex_index
# c = vcol.data[l].color
# if not visit[v]:
# colors[v] = c
# visit[v] = True
# sorted(colors)
# print("Vertex-Colors of Layer:", vcol.name)
# #print(colors)
# for v, c in colors.items():
# print("Vertex {0} has Color {1}".format(v, (c[0], c[1], c[2])))
# bpy.ops.material.new()
# bpy.data.materials["Material.001"].use_backface_culling = True
# bpy.ops.object.mode_set(mode='VERTEX_PAINT')
# create_mat(obj)
# save_blender_scene(path=f'{name}.blend')
# exit()
# for i in range(0, 2):
# a = i * 2 / 180.0 * math.pi
# radius = 2.0
# camera_position=mathutils.Vector(
# (math.cos(a) * radius, math.sin(a) * radius, 1.0 ))
# scene_center=compute_object_center(obj)
# scene_center.z = -0.3
# camera_position += scene_center
# look_at(D.objects['Camera'],
# eye=camera_position,
# at=scene_center)
# render(path=f'{prefix}/frames/output_{str(i).zfill(5)}', file_format='PNG')
# create_video(f'{prefix}/frames', 'output_%05d.png', f"{prefix}/{scene_name}_{name}.mp4")
# if __name__ == "__main__":
# main(scene_name="cnb_103",
# layer_name="InstancesAll") # Color, InstanceAll
# matg = bpy.data.materials.new("Green")
# matg.diffuse_color = (0,1,0,0.8)
# obj.active_material = matg
# obj.vertex_colors.new(name=vertex_colors_name)
# color_layer = mesh.vertex_colors[vertex_colors_name]
# print(len(obj.data.vertices))