by KGD·Motion Graphics
Images © KGD. Used for product review; image policy.
SPEEDZONE earns its place in the Blender extensions library by tying path length directly to real-world speed, frame count, and FPS, so vehicle motion is calculated from your inputs rather than eyeballed by hand.
SPEEDZONE is a Blender add-on that calculates path lengths for realistic vehicle animation with real-world speed. You enter a speed in MPH or Km/h along with a frame count and FPS, and it creates the exact path length needed for physically accurate motion. Two workflows are available: Create Linear Path builds a straight path with evenly spaced points for constant-speed animation, while Rescale Selected Curve takes any curve you draw and rescales it to match your speed and frame settings.
Variable Speed Control lets you set speed changes at specific frames using a frame,multiplier format, with multipliers from 0.1x to 3.0x of the base speed. Colored sphere markers appear at each change point — red for slower, yellow for normal, green for faster — and store the frame number and multiplier. Precision Path Direction Control builds paths along any axis, an eyedropper handles car selection, and a color picker and thickness control adjust how the path looks.
Auto-keyframing applies a Follow Path constraint to the selected car and keyframes the animation across your frame range, supporting both constant and variable speed. SPEEDZONE requires Blender 4.2 or newer and is compatible with 4.3, 4.4, and 5.0, and it is listed here as free.
SPEEDZONE is best for blender artists animating vehicles along paths at real-world speeds with constant or variable pacing.
SPEEDZONE is completely free to download and use.
SPEEDZONE requires Blender 4.2 or newer and is compatible with Blender 4.3, 4.4, and 5.0, with technical specifications listing Blender 4.3.0 and up. The add-on ships with an extension manifest for installation and handles versions accordingly. If you run one of these releases, you can install SPEEDZONE and open it from the 3D Viewport sidebar. For the exact build and any version-specific notes, check the developer's page before installing.
SPEEDZONE handles speed changes through its Variable Speed Control, where you set changes at specific frames using a frame,multiplier format such as 0,1.0;28,0.5;60,1.0. Multipliers range from 0.1x to 3.0x of the base speed, so a vehicle can slow before a corner or speed up on a straight. Colored sphere markers appear at each change point — red for slower, yellow for normal, green for faster — and store the frame number and speed multiplier. A one-click Clear Markers button removes them.
SPEEDZONE keyframes a car with its auto-keyframing feature. You select the vehicle using a dedicated eyedropper field that confirms the chosen car by name, then SPEEDZONE adds a Follow Path constraint and keyframes the animation over your specified frame range. It supports both constant and variable speed modes, so a single action covers steady motion or the speed changes you define at set frames, rather than setting the constraint and keyframes by hand.
SPEEDZONE is listed here as free. The developer describes it as a free Blender add-on and, instead of charging, suggests donating to the Blender Development Fund to help keep Blender open source. It is distributed under the GNU General Public License v3.0 or later. For the current licensing terms and any conditions of use, check the developer's page before downloading so you have the latest details.
SPEEDZONE lives in the 3D Viewport sidebar under View3D > Sidebar > SPEEDZONE, giving it a dedicated panel. From there you enter your speed, frame count, and FPS, choose a path workflow, pick your car with the eyedropper, and adjust the path color and thickness. The add-on is around 32 KB in size and installs through its included extension manifest, and the whole workflow runs from that one panel.
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