/usr/share/k3d/scripts/MeshSourceScript/ is in k3d-data 0.8.0.3-3build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/k3d/scripts/MeshSourceScript/bezier_triangle_patches.py
/usr/share/k3d/scripts/MeshSourceScript/bicubic_patches.py
/usr/share/k3d/scripts/MeshSourceScript/bilinear_patches.py
/usr/share/k3d/scripts/MeshSourceScript/blobby.py
/usr/share/k3d/scripts/MeshSourceScript/cones.py
/usr/share/k3d/scripts/MeshSourceScript/cubes.py
/usr/share/k3d/scripts/MeshSourceScript/cubic_curves.py
/usr/share/k3d/scripts/MeshSourceScript/cylinders.py
/usr/share/k3d/scripts/MeshSourceScript/disks.py
/usr/share/k3d/scripts/MeshSourceScript/hyperboloids.py
/usr/share/k3d/scripts/MeshSourceScript/linear_curves.py
/usr/share/k3d/scripts/MeshSourceScript/nurbs_curves.py
/usr/share/k3d/scripts/MeshSourceScript/nurbs_patches.py
/usr/share/k3d/scripts/MeshSourceScript/paraboloids.py
/usr/share/k3d/scripts/MeshSourceScript/particles.py
/usr/share/k3d/scripts/MeshSourceScript/polyhedra.py
/usr/share/k3d/scripts/MeshSourceScript/simple_polyhedron.py
/usr/share/k3d/scripts/MeshSourceScript/snow_source.py
/usr/share/k3d/scripts/MeshSourceScript/spheres.py
/usr/share/k3d/scripts/MeshSourceScript/teapots.py
/usr/share/k3d/scripts/MeshSourceScript/tori.py