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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Use a radial basis function (RBF) solver in Blender when several pose-related inputs need to control several outputs—for example, when a shoulder pose should blend multiple corrective shapes. For a simple one-input-to-one-output relationship, an ordinary Blender driver is usually easier. Brave Rabbit’s RBF Nodes is a separate, node-based add-on for building these setups; it is not included with Blender.
What an RBF solver does in a Blender rig
RBF stands for radial basis function. RBF Nodes records sample poses and interpolates between their values: multiple inputs can jointly drive multiple output properties through one solver. The add-on’s manual says those properties can include objects, armature bones, shape keys, modifiers, shader properties, and Geometry Nodes values. See the RBF Nodes manual.
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Brave Rabbit describes the add-on as a way to “Drive multiple properties with multiple input values.” That makes it useful when the result depends on a combination of pose values rather than a single direct relationship.
When RBF Nodes can help
Corrective shapes for joints
A shoulder or hip can change shape differently as it twists, lifts, or bends. Brave Rabbit lists corrective shapes for shoulders and hips as use cases: sample representative poses, then use their interpolated values to drive corrective outputs. This is a vendor-stated capability, not an independently tested comparison.
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Facial controls that blend several shapes
For a facial rig, a controller’s position or a combination of controls can influence several shape keys. RBF interpolation can map sampled controller poses to those outputs, rather than requiring a separate hand-authored relationship for each combination.
Properties beyond deformation
The vendor also describes driving shader or Geometry Nodes parameters from transforms or custom values. These are possible applications of the same multi-input/multi-output pattern, not reasons to add an RBF solver to every material or node setup.
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Brave Rabbit says RBF Nodes can reduce reliance on helper bones, long expressions, or scripts. Whether it simplifies a particular rig depends on its controls and maintenance needs; the listing is not an independent performance or workflow test.
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Choose between drivers, authoring, and Runtime
| Option | Best fit | What it does | Cost or deployment note |
|---|---|---|---|
| Ordinary Blender drivers | A simple, direct one-input-to-one-output relationship | Drives a property from another value without a multi-pose solver | Blender feature; simplest choice for a basic corrective |
| RBF Nodes full version | Creating or editing multi-input/multi-output pose interpolation | Authors and edits solver setups | Paid add-on; the Superhive listing showed $17.99 and 12 months of support and product updates on 2026-10-07. Verify current price and terms on the Superhive Marketplace listing. |
| RBF Nodes Runtime | Evaluating an existing setup for playback or rendering | Runs setups but has no authoring or editing features | Free evaluation-only version; the vendor says it may be distributed with a rig, subject to current license terms. |
RBF Nodes is not built into Blender. A rig containing its setups needs RBF Nodes or the Runtime add-on installed and enabled to evaluate them. Brave Rabbit describes Runtime as “RBF Nodes without any authoring features” in its RBF Nodes FAQ. If you receive or deliver a rig, establish whether you need to change its solver or only play and render it; check the current license before redistributing Runtime.
RBF Drivers is a separate Blender add-on project with its own interface and claims about scripted setup and runtime behavior. It is not another name for RBF Nodes, and the available information does not establish matching Blender compatibility.
Check Blender compatibility before installing
Brave Rabbit’s current materials state that version 4 requires Blender 4.2 or later; the marketplace listing reviewed on 2026-10-07 reported compatibility from Blender 4.2 through 5.2. Those are the published requirements and listing range at that time, not a guarantee for later Blender releases. Check the current listing and the manual before installing.
- Confirm the Blender version used by your project and by any playback or render machines.
- Choose the full add-on if you need to create or edit solver setups; choose Runtime only if you need to evaluate existing setups.
- Install the selected add-on using its current vendor instructions, then enable it in Blender’s add-on preferences.
- Open the rig and check that its RBF-driven properties evaluate as expected before handing it off or rendering.
Build samples that cover the poses you need
Brave Rabbit’s FAQ recommends at least three poses—rest plus two others—and suggests three to five well-spread poses as a starting point for a simple setup. These are vendor recommendations, not a universal rule for every rig.
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- Identify which inputs jointly affect the output and decide what properties the solver should drive.
- Record the rest pose and representative poses across the motion you need to support.
- Include important extremes in the sample set. Interpolation is most useful within the sampled range, so relying on it outside that range can produce results the samples do not adequately define.
- Use a range-of-motion animation to expose combinations and extremes that might otherwise be missed.
- Test intermediate poses as well as the recorded samples, then adjust the sample set if the blend is not suitable.
Keep solver scope and cost manageable
Brave Rabbit says solving weights happens when a setup is activated and that playback uses lighter interpolation calculations. This is the vendor’s description of operation, not an independent benchmark. The vendor also says cost grows with the number of inputs, outputs, and poses, and recommends separate solvers for parts that do not influence each other.
- Keep unrelated rig regions in separate solvers rather than combining them without a dependency.
- Use ordinary drivers for straightforward relationships; reserve RBF setups for interactions that benefit from sampled multi-value interpolation.
- Check authoring and evaluation requirements for every destination that must run the rig, including render machines.
Decide whether the extra solver is worthwhile
Start with the simplest relationship that represents the rig. If one control should directly alter one property, use a driver. If multiple pose values must blend into several outputs, RBF Nodes offers a way to author that mapping from sampled poses. For an existing RBF rig that only needs playback or rendering, Runtime may be sufficient; editing the setup requires the full authoring version.
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