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Alembic Controls
Timeline setup. Selector. Selects where the shot is placed on the Alembic timeline. In Match Frames mode, each image frame is placed at its corresponding frame, ie img0225 will be placed at frame 225. In Entire mode, the beginning of the entire shot is placed so that its first frame occurs at the Starting frame#. In Active mode, the Start Frame of the shot (from the Shot Settings) is placed at the Starting frame #. Match Frames mode is the default, but in Match Frames mode, movies are treated as being in Entire mode.
Starting frame#. Numeric. Specifies what frame the beginning of the active or entire shot will be placed on. Not used in Match Frames mode.
Export which shots. Selector. Export only the active shot (ie the shot of the current Active Tracker Host), all shots with the same frame rate as the active shot, all shots with the same frame rate and start/end frame values (typically, a stereo pair), or all shots. When a shot is exported, the camera and all moving objects and their children are exported, as well as meshes parented to them, and unparented meshes.
Output Axis Setting. Selector. Select Y-Up output, which is typical for Alembic, or optionally Z-Up output, which may be useful for 3dsmax.
Include normal. Checkbox. Whether or not they should be placed in the Alembic file, if they are present in the mesh.
Additional scene scaling. Numeric. Use this to scale the entire scene up or down by that factor, for example to make it 10x larger or perhaps apply some units conversion (Alembic doesn't have any idea about "units"). A definitive scene scaling should always be set up in SynthEyes, this is only for adjusting it to accommodate some downstream application.
Fix Anam. distance. Checkbox. When on and a non-zero anamorphic distance value is present, vertex caches will be produced for all meshes so that they are viewed correctly (compensated for anamorphic distance) from the main camera. This is necessarily a viewpoint-specific correction.
Use quads if possible. When set, the export will contain quads, where possible, as well as triangles. When off, only triangles will be exported, which may be necessary for some downstream packages.
Create trackers chisels. Checkbox. When checked, small inverted pyramids (chisels) will be created at each tracker location.
Chisel size override. Numeric. When zero, the size of the chisel is determined automatically based on the SynthEyes world size value. Set a specific value here, if desired. It is a "SynthEyes" value: the Additional scene scaling will be applied to this value.
Create screen. Checkbox. When checked, a projection screen will be created to be the eventual recipient of the shot imagery as a backdrop during effects development.
Based On. Drop-down. Selects whether the distortion applied to the projection screen comes from the image preprocessor or the solver. Normally, you should have run the Lens Workflow script after completing all solving, before exporting to other applications. This will allow you to set up a precise output image. The solver option is primary for legacy workflows, as the export always (& undesirably) exported from solver distortion before 2022.
UV screen mode. Drop-down. Controls when the alternate form of projection screen is use. The normal screen re-positions vertices based on distortion, with a fixed set of texture coordinates. The alternate form uses a fixed set of vertex coordinates, creating a modified set of texture coordinates. The normal version is fine for computed distortions in general. The alternate form is necessary for 1-pass lens workflow setups when the distortion is expressed as a UVMap (STMap), and may also be necessary for some 2-pass setups. The alternate form cannot be used for animated distortions. The settings for this control are Never, If a UVmap is present, and Always. The “If a UVmap is present” setting is the default and is
generally a reasonable approach, though you can use the other settings as the specific scene warrants.
Screen's Distortion Mode. Selector. The screen can be built in such a way that it compensates for the distortion calculated during the solve, ie on the Lens panel. It can also be built to re-apply that distortion, if needed.
Screen distance override. Numeric. The projection screen is normally (ie when this value is zero) located a distance from the camera determined from the Solver panel's world size value. Set a specific value here, if desired. It is a "SynthEyes" value: the Additional scene scaling will be applied to this value
Screen vertical grids. Numeric. The number of grids in the vertical direction for the generated screen. The horizontal number is determined by multiplying this value times the image aspect ratio. A lower number is suitable if there is no distortion, but an increasingly larger value should be if image distortion is present.
Set far and near clips. Checkbox. If set, the Alembic file will contain the clipping values used by SynthEyes, ie on the Perspective View Settings panel. Downstream applications may or may not use these values if they are present.
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