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camera refactoring

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Summary:
Refactor cameras
* CamerasBase was enhanced with `transform_points_screen` that transforms projected points from NDC to screen space
* OpenGLPerspective, OpenGLOrthographic -> FoVPerspective, FoVOrthographic
* SfMPerspective, SfMOrthographic -> Perspective, Orthographic
* PerspectiveCamera can optionally be constructred with screen space parameters
* Note on Cameras and coordinate systems was added

Reviewed By: nikhilaravi

Differential Revision: D23168525

fbshipit-source-id: dd138e2b2cc7e0e0d9f34c45b8251c01266a2063
This commit is contained in:
Georgia Gkioxari
2020-08-20 22:20:41 -07:00
committed by Facebook GitHub Bot
parent 9242e7e65d
commit 57a22e7306
65 changed files with 896 additions and 279 deletions
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12
docs/tutorials/fit_textured_mesh.ipynb
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@@ -129,7 +129,7 @@
"from pytorch3d.structures import Meshes, Textures\n",
"from pytorch3d.renderer import (\n",
" look_at_view_transform,\n",
" OpenGLPerspectiveCameras, \n",
" FoVPerspectiveCameras, \n",
" PointLights, \n",
" DirectionalLights, \n",
" Materials, \n",
@@ -309,16 +309,16 @@
"# the cow is facing the -z direction. \n",
"lights = PointLights(device=device, location=[[0.0, 0.0, -3.0]])\n",
"\n",
"# Initialize an OpenGL perspective camera that represents a batch of different \n",
"# Initialize a camera that represents a batch of different \n",
"# viewing angles. All the cameras helper methods support mixed type inputs and \n",
"# broadcasting. So we can view the camera from the a distance of dist=2.7, and \n",
"# then specify elevation and azimuth angles for each viewpoint as tensors. \n",
"R, T = look_at_view_transform(dist=2.7, elev=elev, azim=azim)\n",
"cameras = OpenGLPerspectiveCameras(device=device, R=R, T=T)\n",
"cameras = FoVPerspectiveCameras(device=device, R=R, T=T)\n",
"\n",
"# We arbitrarily choose one particular view that will be used to visualize \n",
"# results\n",
"camera = OpenGLPerspectiveCameras(device=device, R=R[None, 1, ...], \n",
"camera = FoVPerspectiveCameras(device=device, R=R[None, 1, ...], \n",
" T=T[None, 1, ...]) \n",
"\n",
"# Define the settings for rasterization and shading. Here we set the output \n",
@@ -361,7 +361,7 @@
"# Our multi-view cow dataset will be represented by these 2 lists of tensors,\n",
"# each of length num_views.\n",
"target_rgb = [target_images[i, ..., :3] for i in range(num_views)]\n",
"target_cameras = [OpenGLPerspectiveCameras(device=device, R=R[None, i, ...], \n",
"target_cameras = [FoVPerspectiveCameras(device=device, R=R[None, i, ...], \n",
" T=T[None, i, ...]) for i in range(num_views)]"
],
"execution_count": null,
@@ -925,4 +925,4 @@
]
}
]
}
}