A camera move can change more than the apparent size of a molecular system. If an animation also shifts the camera’s target point, visual effects such as fog or depth of field may behave differently from one frame to the next. That can make a simple close-up feel less consistent than intended.
In SAMSON, the Zoom camera animation offers a straightforward way to change the framing while keeping the target point fixed. It modifies the camera’s position between the animation’s start and end frames, but leaves its target unchanged. This is useful when you want to bring a region of a system closer in view without moving the center that the camera is looking toward.
When a fixed target helps
Imagine preparing a presentation in which the camera gradually moves closer to a molecular structure. You want the audience to see more detail, but you also want the view’s target to remain stable. A fixed target can help avoid introducing an unintended change in the camera’s point of interest as the framing changes.
This distinction matters when using effects that refer to the camera target. The documentation specifically notes Fog and Depth-of-field as examples: Zoom camera can be useful when you want to zoom in without changing target points for those effects. In other words, it separates two choices that can otherwise get mixed together: how close the camera is, and where it is aimed.
Set up the animation
- Choose the animation’s start frame in the Animator’s Track view.
- Orient the view and camera to establish the starting composition.
- In the Animator’s Animation panel, double-click Zoom camera.
- Set the animation’s end frame. You can move the start and end frames later if the timing needs adjustment.
The starting view is important: it establishes the camera position from which the animation begins. Before adding the effect, take a moment to position the camera as you want it at the start of the move. Then review the result across the animation’s frames to see whether the change in framing suits the scene.
Know when to choose a different camera move
Zoom camera is not the only way to animate a camera. Its defining behavior is that the target point stays unchanged. The Dolly camera animation can use different target points at the start and end frames, so it is a better fit when the intended move includes a change in where the camera is aimed. For a camera movement that is about repositioning the view, see the Move camera animation as well.
Choosing between these effects starts with a useful question: should the camera keep looking at the same target, or should that target change during the move? If it should remain fixed while the camera position changes, Zoom camera matches that intent.
Check the camera settings
By default, camera animations apply to the active camera. If you need to change this, inspect the animation and adjust Apply to active camera. The target point used by the animation is defined by the active camera’s current target position, which is essentially the current center of the view. That makes the camera’s setup before the animation an important part of the result.
Camera positions may also be defined differently depending on whether the grid is on or off. To control how the animation behaves in relation to that setting, inspect Keep camera upwards. When this option is checked, the behavior depends on whether the grid is on or off. If the camera’s movement does not look as expected, checking this setting and the grid state is a useful troubleshooting step.
Finally, the Easing curve controls how camera parameters are interpolated between frames. Adjusting it changes the interpolation, so it is worth reviewing the motion from beginning to end after making a change. You can also use the animation controllers to adjust the camera’s target point and positions.
For the complete instructions and related controls, see the Zoom camera documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.