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camera_utils.py
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# SPDX-FileCopyrightText: Copyright (c) 2021-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: LicenseRef-NvidiaProprietary
#
# NVIDIA CORPORATION, its affiliates and licensors retain all intellectual
# property and proprietary rights in and to this material, related
# documentation and any modifications thereto. Any use, reproduction,
# disclosure or distribution of this material and related documentation
# without an express license agreement from NVIDIA CORPORATION or
# its affiliates is strictly prohibited.
"""
Helper functions for constructing camera parameter matrices. Primarily used in visualization and inference scripts.
"""
import math
import torch
import torch.nn as nn
from training.volumetric_rendering import math_utils
class GaussianCameraPoseSampler:
"""
Samples pitch and yaw from a Gaussian distribution and returns a camera pose.
Camera is specified as looking at the origin.
If horizontal and vertical stddev (specified in radians) are zero, gives a
deterministic camera pose with yaw=horizontal_mean, pitch=vertical_mean.
The coordinate system is specified with y-up, z-forward, x-left.
Horizontal mean is the azimuthal angle (rotation around y axis) in radians,
vertical mean is the polar angle (angle from the y axis) in radians.
A point along the z-axis has azimuthal_angle=0, polar_angle=pi/2.
Example:
For a camera pose looking at the origin with the camera at position [0, 0, 1]:
cam2world = GaussianCameraPoseSampler.sample(math.pi/2, math.pi/2, radius=1)
"""
@staticmethod
def sample(horizontal_mean, vertical_mean, horizontal_stddev=0, vertical_stddev=0, radius=1, batch_size=1, device='cpu'):
h = torch.randn((batch_size, 1), device=device) * horizontal_stddev + horizontal_mean
v = torch.randn((batch_size, 1), device=device) * vertical_stddev + vertical_mean
v = torch.clamp(v, 1e-5, math.pi - 1e-5)
theta = h
v = v / math.pi
phi = torch.arccos(1 - 2*v)
camera_origins = torch.zeros((batch_size, 3), device=device)
camera_origins[:, 0:1] = radius*torch.sin(phi) * torch.cos(math.pi-theta)
camera_origins[:, 2:3] = radius*torch.sin(phi) * torch.sin(math.pi-theta)
camera_origins[:, 1:2] = radius*torch.cos(phi)
forward_vectors = math_utils.normalize_vecs(-camera_origins)
return create_cam2world_matrix(forward_vectors, camera_origins)
class LookAtPoseSampler:
"""
Same as GaussianCameraPoseSampler, except the
camera is specified as looking at 'lookat_position', a 3-vector.
Example:
For a camera pose looking at the origin with the camera at position [0, 0, 1]:
cam2world = LookAtPoseSampler.sample(math.pi/2, math.pi/2, torch.tensor([0, 0, 0]), radius=1)
"""
@staticmethod
def sample(horizontal_mean, vertical_mean, lookat_position, horizontal_stddev=0, vertical_stddev=0, radius=1, batch_size=1, device='cpu'):
h = torch.randn((batch_size, 1), device=device) * horizontal_stddev + horizontal_mean
v = torch.randn((batch_size, 1), device=device) * vertical_stddev + vertical_mean
v = torch.clamp(v, 1e-5, math.pi - 1e-5)
theta = h
v = v / math.pi
phi = torch.arccos(1 - 2*v)
camera_origins = torch.zeros((batch_size, 3), device=device)
camera_origins[:, 0:1] = radius*torch.sin(phi) * torch.cos(math.pi-theta)
camera_origins[:, 2:3] = radius*torch.sin(phi) * torch.sin(math.pi-theta)
camera_origins[:, 1:2] = radius*torch.cos(phi)
# forward_vectors = math_utils.normalize_vecs(-camera_origins)
forward_vectors = math_utils.normalize_vecs(lookat_position - camera_origins)
return create_cam2world_matrix(forward_vectors, camera_origins)
class UniformCameraPoseSampler:
"""
Same as GaussianCameraPoseSampler, except the
pose is sampled from a uniform distribution with range +-[horizontal/vertical]_stddev.
Example:
For a batch of random camera poses looking at the origin with yaw sampled from [-pi/2, +pi/2] radians:
cam2worlds = UniformCameraPoseSampler.sample(math.pi/2, math.pi/2, horizontal_stddev=math.pi/2, radius=1, batch_size=16)
"""
@staticmethod
def sample(horizontal_mean, vertical_mean, horizontal_stddev=0, vertical_stddev=0, radius=1, batch_size=1, device='cpu'):
h = (torch.rand((batch_size, 1), device=device) * 2 - 1) * horizontal_stddev + horizontal_mean
v = (torch.rand((batch_size, 1), device=device) * 2 - 1) * vertical_stddev + vertical_mean
v = torch.clamp(v, 1e-5, math.pi - 1e-5)
theta = h
v = v / math.pi
phi = torch.arccos(1 - 2*v)
camera_origins = torch.zeros((batch_size, 3), device=device)
camera_origins[:, 0:1] = radius*torch.sin(phi) * torch.cos(math.pi-theta)
camera_origins[:, 2:3] = radius*torch.sin(phi) * torch.sin(math.pi-theta)
camera_origins[:, 1:2] = radius*torch.cos(phi)
forward_vectors = math_utils.normalize_vecs(-camera_origins)
return create_cam2world_matrix(forward_vectors, camera_origins)
def create_cam2world_matrix(forward_vector, origin):
"""
Takes in the direction the camera is pointing and the camera origin and returns a cam2world matrix.
Works on batches of forward_vectors, origins. Assumes y-axis is up and that there is no camera roll.
"""
forward_vector = math_utils.normalize_vecs(forward_vector)
up_vector = torch.tensor([0, 1, 0], dtype=torch.float, device=origin.device).expand_as(forward_vector)
right_vector = -math_utils.normalize_vecs(torch.cross(up_vector, forward_vector, dim=-1))
up_vector = math_utils.normalize_vecs(torch.cross(forward_vector, right_vector, dim=-1))
rotation_matrix = torch.eye(4, device=origin.device).unsqueeze(0).repeat(forward_vector.shape[0], 1, 1)
rotation_matrix[:, :3, :3] = torch.stack((right_vector, up_vector, forward_vector), axis=-1)
translation_matrix = torch.eye(4, device=origin.device).unsqueeze(0).repeat(forward_vector.shape[0], 1, 1)
translation_matrix[:, :3, 3] = origin
cam2world = (translation_matrix @ rotation_matrix)[:, :, :]
assert(cam2world.shape[1:] == (4, 4))
return cam2world
def FOV_to_intrinsics(fov_degrees, device='cpu'):
"""
Creates a 3x3 camera intrinsics matrix from the camera field of view, specified in degrees.
Note the intrinsics are returned as normalized by image size, rather than in pixel units.
Assumes principal point is at image center.
"""
focal_length = float(1 / (math.tan(fov_degrees * 3.14159 / 360) * 1.414))
intrinsics = torch.tensor([[focal_length, 0, 0.5], [0, focal_length, 0.5], [0, 0, 1]], device=device)
return intrinsics