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import argparse
import os
import json
from math import radians
import bpy
import numpy as np
COLOR_SPACES = ["display", "linear"]
DEVICES = ["cpu", "cuda", "optix"]
def listify_matrix(matrix):
matrix_list = []
for row in matrix:
matrix_list.append(list(row))
return matrix_list
def parent_obj_to_camera(b_camera, origin):
b_empty = bpy.data.objects.new("Empty", None)
b_empty.location = origin
b_camera.parent = b_empty
scn = bpy.context.scene
scn.collection.objects.link(b_empty)
bpy.context.view_layer.objects.active = b_empty
return b_empty
def main(args):
bpy.ops.wm.open_mainfile(filepath=args.blend_path)
scene = bpy.data.scenes["Scene"]
scene.render.engine = "CYCLES"
scene.render.use_persistent_data = True
scene.cycles.samples = 256
bpy.context.scene.unit_settings.scale_length = 0.01
if args.device == "cpu":
bpy.context.preferences.addons["cycles"].preferences.compute_device_type = "NONE"
bpy.context.scene.cycles.device = "CPU"
elif args.device == "cuda":
bpy.context.preferences.addons["cycles"].preferences.compute_device_type = "CUDA"
bpy.context.scene.cycles.device = "GPU"
elif args.device == "optix":
bpy.context.preferences.addons["cycles"].preferences.compute_device_type = "OPTIX"
bpy.context.scene.cycles.device = "GPU"
bpy.context.preferences.addons["cycles"].preferences.get_devices()
scene.view_layers[0].use_pass_combined = True
scene.use_nodes = True
tree = scene.node_tree
if args.depth:
scene.view_layers[0].use_pass_z = True
combine_color = tree.nodes.new("CompositorNodeCombineColor")
depth_output = tree.nodes.new("CompositorNodeOutputFile")
if args.normal:
scene.view_layers[0].use_pass_normal = True
normal_output = tree.nodes.new("CompositorNodeOutputFile")
if args.depth or args.normal:
render_layers = tree.nodes.new("CompositorNodeRLayers")
scene.render.filepath = args.renders_path
scene.render.use_file_extension = True
scene.render.use_overwrite = True
scene.render.image_settings.color_mode = "RGBA"
if args.color_space == "display":
scene.render.image_settings.file_format = "PNG"
scene.render.image_settings.color_depth = "8"
scene.render.image_settings.color_management = "FOLLOW_SCENE"
elif args.color_space == "linear":
scene.render.image_settings.file_format = "OPEN_EXR"
scene.render.image_settings.color_depth = "32"
if args.depth:
depth_output.base_path = os.path.join(args.renders_path, "depth")
depth_output.file_slots[0].use_node_format = True
scene.frame_set(0)
depth_output.format.file_format = "OPEN_EXR"
depth_output.format.color_mode = "RGB"
depth_output.format.color_depth = "32"
depth_output.format.exr_codec = "NONE"
links = tree.links
combine_color.mode = "RGB"
links.new(render_layers.outputs["Depth"], combine_color.inputs["Red"])
combine_color.inputs["Green"].default_value = 0
combine_color.inputs["Blue"].default_value = 0
combine_color.inputs["Alpha"].default_value = 1
links.new(combine_color.outputs["Image"], depth_output.inputs["Image"])
if args.normal:
normal_output.base_path = os.path.join(args.renders_path, "normal")
normal_output.file_slots[0].use_node_format = True
scene.frame_set(0)
normal_output.format.file_format = "OPEN_EXR"
normal_output.format.color_mode = "RGB"
normal_output.format.color_depth = "32"
normal_output.format.exr_codec = "NONE"
links = tree.links
combine_color.mode = "RGB"
links.new(render_layers.outputs["Normal"], normal_output.inputs["Image"])
scene.render.dither_intensity = 0.0
scene.render.film_transparent = True
scene.render.resolution_percentage = 100
scene.render.resolution_x = args.resolution[0]
scene.render.resolution_y = args.resolution[1]
cam = bpy.data.objects["Camera"]
cam.location = (4.0, -214.736, 120.0)
cam.rotation_mode = "XYZ"
cam_constraint = cam.constraints.new(type="TRACK_TO")
cam_constraint.track_axis = "TRACK_NEGATIVE_Z"
cam_constraint.up_axis = "UP_Y"
b_empty = parent_obj_to_camera(cam, (0, 0, 100.0))
cam_constraint.target = b_empty
args.renders_path = os.path.normpath(args.renders_path)
folder_name = os.path.basename(args.renders_path)
renders_parent_path = os.path.dirname(args.renders_path)
transforms_path = os.path.join(renders_parent_path, f"transforms_{folder_name}.json")
stepsize = 360.0 / args.num_views
out_data = {
"camera_angle_x": cam.data.angle_x,
"frames": []
}
for i in range(args.num_views):
if args.random_views:
if args.upper_views:
# 从上半球随机采样视图
# 限制 x 轴（pitch）的旋转范围以避免向下拍摄
pitch = radians(np.random.uniform(-20.0 , 30.0)) # 限制俯仰角在 0 到 90 度之间
yaw = radians(np.random.uniform(0, 360)) # 随机偏航角
b_empty.rotation_euler = (pitch, 0, yaw)
else:
# 完全随机采样视图
b_empty.rotation_euler = (
radians(np.random.uniform(0, 180)),
0,
radians(np.random.uniform(0, 360))
)
else:
# 等间隔采样视图
b_empty.rotation_euler[2] = radians(i * stepsize)
scene.render.filepath = os.path.join(args.renders_path, f"r_{i}")
if args.depth:
depth_output.file_slots[0].path = f"r_{i}"
if args.normal:
normal_output.file_slots[0].path = f"r_{i}"
bpy.ops.render.render(write_still=True)
if args.depth:
os.rename(os.path.join(depth_output.base_path, f"r_{i}0000.exr"),
os.path.join(depth_output.base_path, f"r_{i}.exr"))
if args.normal:
os.rename(os.path.join(normal_output.base_path, f"r_{i}0000.exr"),
os.path.join(normal_output.base_path, f"r_{i}.exr"))
frame_data = {
"file_path": os.path.join(".", os.path.relpath(scene.render.filepath, start=renders_parent_path)),
"rotation": radians(i * stepsize),
"transform_matrix": listify_matrix(cam.matrix_world)
}
out_data["frames"].append(frame_data)
with open(transforms_path, "w") as out_file:
json.dump(out_data, out_file, indent=4)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Script for rendering novel views of synthetic Blender scenes.")
parser.add_argument("blend_path", type=str, help="Path to the blend-file of the synthetic Blender scene.")
parser.add_argument("renders_path", type=str, help="Desired path to the novel view renders.")
parser.add_argument("num_views", type=int, help="Number of novel view renders.")
parser.add_argument("resolution", type=int, nargs=2, default=[1080, 720], help="Image resolution of the novel view renders.")
parser.add_argument("--color_space", type=str, choices=COLOR_SPACES, default="display", help="Color space of the output novel view images.")
parser.add_argument("--device", type=str, choices=DEVICES, default="cuda", help="Compute device type for rendering.")
parser.add_argument("--random_views", action="store_true", help="Randomly sample novel views.")
parser.add_argument("--upper_views", action="store_true", help="Only sample novel views from the upper hemisphere.")
parser.add_argument("--depth", action="store_true", help="Render depth maps too.")
parser.add_argument("--normal", action="store_true", help="Render normal maps too.")
args = parser.parse_args()
main(args)
# bpy.context.scene.unit_settings.scale_length = 0.01
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