I want to hide an object in the Viewport up to a certain frame in the Timeline and then make it visible (e.g. at frame 30). How can i do that?
Make your Object visible at frame 30:
You can keyframe the Viewport Visibility of an Object from within the Outliner:
- In the Timeline select Frame 1
- Then open the Outliner
- Set your Object to Hidden
- While the mouse hovers over the eye icon in the outliner, press I to keyframe the visibility.
- Move on to frame 30
- Click on the Eye icon again to make the object visible
Then press I again to keyframe the visibility change.
Note: If you want to achieve the same for your render, then please check the answer in here: How can I animate the Restrict Visibility property of an object?