Houdini | Black hole lensing effect (free hda)

Based on these Blender tutorials by Samuel Krug (parts of his black hole series): I have no idea if this is scientifically accurate or not. My goal was just to recreate in Houdini what Samuel does in Blender. By the way check out his works, it's fantastic! VEX shader: Karma shader: Example hip: Some parts of the video are sped up by 150-200%. CPU: AMD Ryzen 7 5700X 8-core, 3.4 GHz GPU: RTX 3050 Take care! 0:00 Test renders 0:48 Do transformations at object level 1:03 Mantra render 1:51 Karma render 2:52 Kerr Distortion 3:51 Playing with the shape 4:39 Unwanted specular(ish) thing 5:00 Dispersion (just for fun) 5:43 Multiple black holes 7:05 Galaxy background 8:06 Non-spherical black hole 10:04 Take care!