add some base files

mattport/nerf/cameras.py

@@ -0,0 +1,41 @@
+"""
+Camera Models
+"""
+from dataclasses import dataclass
+from torchtyping import TensorType
+
+
+@dataclass
+class Rays:
+    """Camera rays. Can be arbitrary dimension"""
+
+    origin: TensorType[..., 3]
+    direction: TensorType[..., 3]
+
+
+class Camera:
+    """Base Camera. Intended to be subclassed"""
+
+    def __init__(self, height, width, camera_to_world) -> None:
+        self.height = height
+        self.width = width
+        self.camera_to_world = camera_to_world
+
+    def get_rays(self, coords: TensorType[..., 2]) -> Rays:
+        """Encodes an input tensor.
+
+        Args:
+            coords (TensorType[..., 2]): Input tensor to be encoded
+
+        Returns:
+            TensorType[..., "output_dim"]: A encoded input tensor
+        """
+        raise NotImplementedError
+
+    def get_all_rays(self) -> Rays:
+        """Generate rays for entire camera
+
+        Returns:
+            Rays: Camera rays of shape [height, width]
+        """
+        raise NotImplementedError