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Up vector for plotly

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Summary: We previously did not send an `up` vector in to plotly when visualization_cameras is supplied. This meant the image would have the default orientation instead of the correct one. Now we use the library function `camera_to_eye_at_up` to calculate the plotly position, which includes the `up` vector.

Reviewed By: nikhilaravi

Differential Revision: D25981183

fbshipit-source-id: abec72b349f3a5519209e0e6c0518133c3750807
This commit is contained in:
Jeremy Reizenstein 2021-01-22 07:31:50 -08:00 committed by Facebook GitHub Bot
parent cf9bb7c48c
commit 8eba1684cb
1 changed files with 27 additions and 24 deletions
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51
pytorch3d/vis/plotly_vis.py
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@ -8,6 +8,7 @@ import plotly.graph_objects as go
import torch
from plotly.subplots import make_subplots
from pytorch3d.renderer import TexturesVertex
from pytorch3d.renderer.camera_utils import camera_to_eye_at_up
from pytorch3d.renderer.cameras import CamerasBase
from pytorch3d.structures import Meshes, Pointclouds, join_meshes_as_scene
@ -224,23 +225,14 @@ def plot_scene(
}
viewpoints_eye_at_up_world = None
if viewpoint_cameras:
if len(viewpoint_cameras) == len(subplots) or len(viewpoint_cameras) == 1:
n_viewpoint_cameras = len(viewpoint_cameras)
if n_viewpoint_cameras == len(subplots) or n_viewpoint_cameras == 1:
# Calculate the vectors eye, at, up in world space
# to initialize the position of the camera in
# the plotly figure
# TODO(T77879494): correct the up vector calculation in the world space.
eye_at_up_view = (
torch.tensor([[0, 0, 0], [0, 0, 1], [0, 1, 0]])
.float()
.to(viewpoint_cameras.device)
viewpoints_eye_at_up_world = camera_to_eye_at_up(
viewpoint_cameras.get_world_to_view_transform().cpu()
)
viewpoints_eye_at_up_world = (
viewpoint_cameras.get_world_to_view_transform()
.inverse()
.transform_points(eye_at_up_view)
)
if len(viewpoints_eye_at_up_world.shape) < 3:
viewpoints_eye_at_up_world = viewpoints_eye_at_up_world.unsqueeze(0)
else:
msg = "Invalid number {} of viewpoint cameras were provided. Either 1 \
or {} cameras are required".format(
@ -290,29 +282,33 @@ def plot_scene(
# update camera viewpoint if provided
if viewpoints_eye_at_up_world is not None:
# Use camera params for batch index or the first camera if only one provided.
viewpoint_idx = min(len(viewpoints_eye_at_up_world) - 1, subplot_idx)
eye, at, _up = viewpoints_eye_at_up_world[viewpoint_idx]
viewpoint_idx = min(n_viewpoint_cameras - 1, subplot_idx)
eye, at, up = (i[viewpoint_idx] for i in viewpoints_eye_at_up_world)
eye_x, eye_y, eye_z = eye.tolist()
at_x, at_y, at_z = at.tolist()
up_x, up_y, up_z = up.tolist()
# scale camera eye to plotly [-1, 1] ranges
x_range = xaxis["range"]
y_range = yaxis["range"]
z_range = zaxis["range"]
eye_x = _scale_camera_to_bounds(eye_x, x_range)
eye_y = _scale_camera_to_bounds(eye_y, y_range)
eye_z = _scale_camera_to_bounds(eye_z, z_range)
eye_x = _scale_camera_to_bounds(eye_x, x_range, True)
eye_y = _scale_camera_to_bounds(eye_y, y_range, True)
eye_z = _scale_camera_to_bounds(eye_z, z_range, True)
at_x = _scale_camera_to_bounds(at_x, x_range)
at_y = _scale_camera_to_bounds(at_y, y_range)
at_z = _scale_camera_to_bounds(at_z, z_range)
at_x = _scale_camera_to_bounds(at_x, x_range, True)
at_y = _scale_camera_to_bounds(at_y, y_range, True)
at_z = _scale_camera_to_bounds(at_z, z_range, True)
up_x = _scale_camera_to_bounds(up_x, x_range, False)
up_y = _scale_camera_to_bounds(up_y, y_range, False)
up_z = _scale_camera_to_bounds(up_z, z_range, False)
camera["eye"] = {"x": eye_x, "y": eye_y, "z": eye_z}
camera["center"] = {"x": at_x, "y": at_y, "z": at_z}
camera["up"] = {"x": up_x, "y": up_y, "z": up_z}
current_layout.update(
{
@ -751,7 +747,9 @@ def _update_axes_bounds(
current_layout.update({"xaxis": xaxis, "yaxis": yaxis, "zaxis": zaxis})
def _scale_camera_to_bounds(coordinate: float, axis_bounds: Tuple[float, float]):
def _scale_camera_to_bounds(
coordinate: float, axis_bounds: Tuple[float, float], is_position: bool
):
"""
We set our plotly plot's axes' bounding box to [-1,1]x[-1,1]x[-1,1]. As such,
the plotly camera location has to be scaled accordingly to have its world coordinates
@ -762,7 +760,12 @@ def _scale_camera_to_bounds(coordinate: float, axis_bounds: Tuple[float, float])
coordinate: the float value to be transformed
axis_bounds: the bounds of the plotly plot for the axis which
the coordinate argument refers to
is_position: If true, the float value is the coordinate of a position, and so must
be moved in to [-1,1]. Otherwise it is a component of a direction, and so needs only
to be scaled.
"""
scale = (axis_bounds[1] - axis_bounds[0]) / 2
if not is_position:
return coordinate / scale
offset = (axis_bounds[1] / scale) - 1
return coordinate / scale - offset