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This phase "solves" a camera or object on a single frame, by storing the coordinates given as parameters into the Solve path. For example, if you have a solution up to frame 50, and another solution for a region starting at frame 70, you can use a Set Path phase to add a path key on frame 70, then use the Splice Path to smoothly splice the second solution onto the end. Or, you can use several Set Path phases in a row to hand-animate a path.
Important : When using Set Path 1f (with Move whole scene off, see below), you must always have a complete coordinate system set up in the phases prior to Set Path 1f. Otherwise the coordinates in this phase will not make sense when the incoming scene moves around from one solve to the next.
The Set Path phase has many controls, but mainly because it gives you individual values for each X, Y, Z, pan, tilt, roll coordinate value, plus an enable checkbox to say whether you want to change that value or not.
Usually, you will leave all the enables on and set all the channel values by clicking the Set position button, which sets the current camera/object position and orientation values into the Set Path phase's values. Thus, rather than having to figure out the right values, you can simply position the camera or object in 3D in the viewports, then click the Set Position button.
The Frame# parameter says which frame will be changed (by storing the parameter values). You can set this value manually, or click the Set frame button to store the current frame number.
Note that the Set Position button uses the camera/object's current position on the current frame in the main user interface, ie the main timebar's frame number, not the frame number that is stored on the Set Path phase (which would be confusing).
You can select the key type for the position channels to splined or linear using the Pos key type control. Note that this affects X, Y, and Z. There are not separate controls for each axis as this is rarely necessary and would further increase the number of controls. If you really need to do that, use consecutive Set Path 1f phases on the same frame with different key types.
If the "Move whole scene" checkbox is on, then the camera/object is moved to the specified location, but the entire scene is carried along with it, as if the Whole button on the 3-D panel was turned on. This gives another option for setting up coordinate systems, to achieve a specific position/orientation at any point along a path. When doing this, you should always have a size constraint of some kind before the input to Set Path 1f, so that any later change in scale does not affect the positioning you have set up here.
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