I setup a scene with a camera at 1 km from my building, zoomed with a 400mm lenght (to remove perspective like an orthographic view) and I tied up the camera to octane using the nodal trick (I render the grass and plants directly in lightwave and need a match between lightwabve and octane camera for compositing purpose. There are too many instances to render with my dual GTX 780 ti)
I get this very strange circular patterns in my renders...
