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Foot Tracker Placement for Full Body Tracking
Jul
For a SlimeVR Foot role, place each tracker on top of the foot. SlimeVR’s current documentation says tracker “up” should point toward the ankle and tracker “front” should face the ceiling. Set the correct Foot role and mounting orientation, secure the tracker so it does not rotate, and test the movements you actually use before mounting calibration.
This guide stays foot-specific. For the wider hip, waist, and foot map, use the full body tracker location guide. For the whole-kit sequence from assigned roles through standing and sitting checks, use the pre-calibration wear checklist.
Place the Foot role on top of the foot
SlimeVR separates the physical body role from mounting orientation. The role tells the server which body point the device represents. Mounting orientation tells it how the tracker is facing while you wear it. Both must describe the real setup.
For the Foot role, the official recommendation is the top of the foot. “Up” points toward the ankle, while “front” points upward toward the ceiling. These labels describe the tracker’s own configured axes; they do not mean that the top surface of every third-party enclosure has identical markings. Confirm the direction shown for your device in the SlimeVR interface.
The tracker should remain in the same relationship to the foot as you move. A mount can feel attached while standing yet rotate during a pivot or heel lift. If the device turns independently of your foot, correct the physical mount first. Recalibrating around a moving tracker will not make the mount repeatable.
Do not confuse Foot with Lower Leg
“Foot tracker” and “ankle tracker” are often used casually, but SlimeVR documents them as different roles. Its recommended Lower Leg position is at the ankle and may face any direction when mounting orientation is configured correctly. Its recommended Foot position is on top of the foot with the specific direction described above.
Use the role that matches your saved body configuration. Do not move a device from the foot to the ankle while leaving it assigned as Foot and assume the result is equivalent. If your setup uses Lower Leg trackers but not Foot roles, follow that configuration instead of adding a foot point that the server is not expecting.
Choose a repeatable footwear surface
The best surface is the one that lets the tracker keep the same position without creating an uncomfortable pressure point. Test the footwear you will actually use; a stable test in shoes does not prove that the same strap path will work over socks.
| Surface | What to check | Repeatability risk |
|---|---|---|
| Shoes | Place the tracker on a stable upper area, away from a lace knot or flex point that tilts it. | A different shoe shape can change both angle and strap path. |
| Socks | Check whether the strap and sock rotate together during turns and heel raises. | Smooth fabric may shift even when the strap initially feels secure. |
| Bare foot | Check comfort, skin contact, and pressure before adding movement. | Stop and refit if the mount causes pain, numbness, or a concentrated pressure point. |
| Slippers or soft footwear | Check whether the footwear moves independently of the foot. | A secure tracker cannot fix footwear that slides or twists underneath it. |
Change one variable at a time. If the left tracker rotates, adjust the left strap path and repeat the same movement instead of changing footwear, roles, orientation, and calibration together. General tension, fabric contact, and strap-slip questions belong in the VR tracker strap fit guide.
Run a five-move standing check
Look at each tracker before the test so you know its starting angle. Then perform the same short sequence on both sides:
- Stand in a relaxed neutral stance with both feet flat.
- Take two normal steps forward and two steps back.
- Raise one heel, lower it, and repeat on the other side.
- Make a controlled quarter-turn left and then right.
- Return to the original stance and compare both trackers with their starting positions.
Repeat the movement that caused a shift. If the tracker rotates at the same point each time, the failure is physical and reproducible. Refit it before mounting calibration. If the device stays fixed but the represented foot points the wrong way in SlimeVR, recheck the assigned role and mounting orientation.
Test seated use and active movement separately
A standing check is not enough for every session. For seated social VR, sit in the chair you actually use, place both feet where they normally rest, move one foot back, and stand again. Check whether the chair base, trouser cuff, or other foot contacts pushed a tracker out of position.
For dancing or active VR, add a short warm-up, gentle pivots, and the largest step you can safely repeat in your clear play area. Sweat, repeated flexing, and sharper turns can expose a mount that passed a cold standing test. Recheck the physical angle after the warm-up rather than waiting for the avatar to look wrong in a public session.
Do not turn this into an endurance test. The goal is to reproduce the movements that matter and confirm that the tracker still matches the foot. A short, controlled check that repeats the same movements is more useful than changing the routine on every attempt.
Diagnose foot slide from the physical point outward
Avatar feet can slide even when a strap feels secure. Start with the foot tracker, but stop treating placement as the only cause when the evidence points elsewhere.
| What you observe | Check next | Boundary |
|---|---|---|
| One physical tracker moved after a turn | Footwear surface, strap path, and the exact trigger movement | Fix and repeat the movement before calibration. |
| Tracker stayed fixed, but one virtual foot points incorrectly | Foot role, left/right assignment, and mounting orientation | Correct the mismatched point rather than refitting every tracker. |
| Both feet look wrong with an unstable hip or body center | Hip/waist placement and the wider body map | Use the broader location guide; this is no longer foot-only. |
| Feet slide immediately after reset or across several body points | Setup sequence, mounting calibration, and full reset state | Use the setup and calibration workflow. |
| Only one unusual or digitigrade avatar shows the problem | Avatar fit and SlimeVR body proportions | Do not guess Foot Shift values; verify mounting first, then use the official body-proportion guide. |
Use this foot placement checklist
- The device is assigned to the intended Foot role and correct side.
- The tracker sits on top of the foot.
- Tracker “up” points toward the ankle and “front” faces the ceiling.
- The footwear and strap path match the real session.
- Both trackers keep their angle through steps, heel raises, turns, sitting, and standing again.
- Physical rotation is fixed before mounting calibration.
- Non-foot symptoms are handed to the body-map or calibration workflow instead of being hidden by repeated resets.
Check what your Foot-role setup needs
Review the current FBTKit tracker-count options and included parts, then use the movement test above to confirm each Foot-role mount stays aligned. For a setup-specific question, use the contact page and include the assigned role, footwear, trigger movement, and whether the physical tracker rotated.
FAQ
Where should SlimeVR foot trackers be placed?
For the SlimeVR Foot role, place each tracker on top of the foot. Confirm that the physical tracker stays aligned through the movements you use before running mounting calibration.
Which way should a SlimeVR foot tracker face?
SlimeVR’s placement guide says tracker “up” should point toward the ankle and tracker “front” should face the ceiling. Confirm the matching mounting orientation in the SlimeVR interface for your device.
Should foot trackers go on the feet or ankles?
Use the position that matches the assigned role. SlimeVR recommends the Foot role on top of the foot and the Lower Leg role at the ankle, so do not move between them without checking the saved body role and mounting orientation.
Why do avatar feet slide when the trackers feel secure?
Check role, left/right assignment, and mounting orientation first. If both feet slide or the hip and body center also look wrong, move to the wider placement, calibration, or body-proportion workflow instead of repeatedly tightening the foot straps.
Official sources
- SlimeVR Docs: Putting on Your Trackers
- SlimeVR Docs: Quick Setup
- SlimeVR Docs: Body Proportions Configuration
Official SlimeVR sources were checked on August 10, 2026. This guide does not claim a universal mount across every tracker ecosystem or a first-hand FBTKit footwear test.
