by trisnox·Motion Graphics
Images © trisnox. Used for product review; image policy.
Trajectory Anim earns its place in the blender_extensions library for turning a drawn line into position or rotation animation, with the trajectory represented as an Annotation, Grease Pencil, or Curve object.
Trajectory Anim is a Blender add-on for animating an object or bone by drawing a trajectory line. It works similarly to Follow Path constraints, which the developer describes as more convenient and faster than using the constraints themselves. Beyond following and rotating along the path, you can draw a trajectory line to represent rotation.
You can also draw an intersection line within the trajectory line to represent a timing chart, giving better control over timing and easing. The trajectory line can be represented using an Annotation, a Grease Pencil object, or a Curve object. The panel is available in the 3D viewport under TrajectAnim: select an object or bone, pick the annotation tool, draw the line, then press Animate Position or Rotation in the main panel.
Version 1.3.0 adds an Annotation Strokes update for Blender 5.2 or higher, with functions to convert a curve to annotation, remove excess stroke, and self intersect. It is compatible with Blender 4.3 and newer and released under the GNU General Public License v3.0 or later.
Trajectory Anim is best for animating objects or bones in Blender by drawing trajectory lines instead of setting up Follow Path constraints.
Trajectory Anim is completely free to download and use.
Trajectory Anim is compatible with Blender 4.3 and newer. Its core workflow, drawing a trajectory line and pressing Animate Position or Rotation, runs on those versions. Some functionality is tied to later releases: the Annotation Strokes update in version 1.3.0, which adds converting a curve to annotation, removing excess stroke, and self intersect, is available on Blender 5.2 or higher only, and earlier versions will not show those buttons. For the current version and full details, check the developer's page.
Trajectory Anim version 1.3.0 introduces an Annotation Strokes update for Blender 5.2 or higher. Because annotation strokes can now be modified, it adds functions to convert a curve to annotation, remove excess stroke, and self intersect; on earlier versions those buttons stay hidden. The release also fixes an active_object error that could arise when animate position ran on an empty, resolves a grease pencil self intersect error caused by a typo, and updates the annotation panel to iterate through data so renaming a data block no longer makes the panel disappear.
Trajectory Anim is used from the TrajectAnim panel in the 3D viewport. Select an object or bone, choose the annotation tool, draw a trajectory line, then press Animate Position or Rotation in the main panel. Beyond following or rotating along the path, you can draw a trajectory line to represent rotation, and draw an intersection line within it to represent a timing chart for control over timing and easing. The trajectory line can be represented using an Annotation, a Grease Pencil object, or a Curve object. See the developer's documentation for more information.
Trajectory Anim is listed as free here and released under the GNU General Public License v3.0 or later. The extension does not require special permissions. For current licensing terms and any conditions, check the developer's page. The add-on is a small download at 44.8 KB and, at the time of listing, had been downloaded 6863 times with a rating of 5 across its reviews. Compatibility is Blender 4.3 and newer.
Trajectory Anim lets the trajectory line be represented using an Annotation, a Grease Pencil object, or a Curve object. After drawing the line, you press Animate Position or Rotation from the main panel to animate a selected object or bone. As of version 1.3.0 on Blender 5.2 or higher, the Annotation Strokes update adds functions to convert a curve to annotation, remove excess stroke, and self intersect, giving more ways to work with the drawn line. The panel lives in the 3D viewport under TrajectAnim.
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