a few days ago I started to learn Blender. I only have experience with Affinity Designer and Illustrator Layers and Masks and stuff like that. I have this little scene:
Link to the file: Blender File
What I want is for the red frame object to also be a sort of cut mask for the green object. So, in the rendering view, I want to see only the parts of the green object that show through inside the opening of the red frame. I hope I have described it in an understandable way.
What is the name of the technique or tool in Blender to do this?
Sorry if this question has been asked before.