1. Here's how
The following technique demonstrates how to create a camera Keyframe in a second Clip that matches the last camera Keyframe in the previous Clip. This will make a smooth transition between two Clips.
The technique can also be used for copying and pasting different camera Keyframes from one Clip to another.
1.1: In Photo Mode, please make sure that there is an unused Photo Slot in Photo Set 1.
It must be in Photo Set 1 so that the keyboard shortcuts are recognized.
1.2: Make a note of the Photo Slot number. Let's say Photo Slot number 7 in this example.
1.3: In Movie Mode, edit the Clip that you want to use as the source, and select the last camera Keyframe in the Clip.
1.4: Then press CTRL + 7 to store the camera angle/position in Photo Slot number 7 in Photo Mode.
1.5: In Movie Mode, edit the Clip that you want to use as the destination, and select the first camera Keyframe in the Clip.
1.6: Press SHIFT + 7 to restore the saved camera position from Photo Slot number 7.
1.7: Then click on the Take Photo button to overwrite the existing camera Keyframe.
1.8: The Clips now have the same ending and beginning camera Keyframes. Playing the Movie shows no change between the two Clips as wanted.
Knowledge Base: Is there a list of all the keyboard shortcuts in Lumion 9? (Section 3. Save & load camera viewpoints)