"""Add non-repeating mineral/weathering patches to the authored granite atlas."""
import bpy,numpy as np
im=bpy.data.images['Summit unique weathered granite'];w,h=im.size
p=np.asarray(im.pixels[:],dtype=np.float32).reshape(h,w,4)
rng=np.random.default_rng(141)
def cloud(n):
    grid=rng.uniform(-1,1,(n,n));xs=np.linspace(0,n-1,w);ys=np.linspace(0,n-1,h)
    rows=np.array([np.interp(xs,np.arange(n),row) for row in grid])
    return np.array([np.interp(ys,np.arange(n),rows[:,i]) for i in range(w)]).T
patch=cloud(12)*.065+cloud(48)*.045+cloud(170)*.025
p[:,:,:3]=np.clip(p[:,:,:3]+patch[:,:,None],0,1)
im.pixels.foreach_set(p.ravel());im.update();im.save()
bpy.ops.wm.save_as_mainfile(filepath=bpy.data.filepath)
print('Saved non-repeating mineral patches and weathering atlas',w,h)