release silica model

release silica nerf model and reconstructed mesh (spheric poses)
link to the data
image size is 504x378 (original size 4032x3024)

Usage: place the poses_bounds.npy under a folder $DIR (anywhere you want), then you can run

python eval.py \
   --root_dir $DIR \
   --dataset_name llff --scene_name silica \
   --img_wh 504 378 --N_importance 64 --spheric_poses --ckpt_path $CKPT_PATH

as usual. To extract the mesh, follow README_mesh.