[WIP] Mesh export UI (#1076)

* starting PR

* export mesh ui functional

* better descriptions

scripts/exporter.py

@@ -58,7 +58,7 @@ class ExportPointCloud(Exporter):
     """Minimum of the bounding box, used if use_bounding_box is True."""
     bounding_box_max: Tuple[float, float, float] = (1, 1, 1)
     """Minimum of the bounding box, used if use_bounding_box is True."""
-    num_rays_per_batch: int = 65536
+    num_rays_per_batch: int = 32768
     """Number of rays to evaluate per batch. Decrease if you run out of memory."""
     std_ratio: float = 10.0
     """Threshold based on STD of the average distances across the point cloud to remove outliers."""
@@ -195,7 +195,7 @@ class ExportPoissonMesh(Exporter):
     """Minimum of the bounding box, used if use_bounding_box is True."""
     bounding_box_max: Tuple[float, float, float] = (1, 1, 1)
     """Minimum of the bounding box, used if use_bounding_box is True."""
-    num_rays_per_batch: int = 65536
+    num_rays_per_batch: int = 32768
     """Number of rays to evaluate per batch. Decrease if you run out of memory."""
     texture_method: Literal["point_cloud", "nerf"] = "nerf"
     """Method to texture the mesh with. Either 'point_cloud' or 'nerf'."""