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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/colors.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/colors.json
new file mode 100644
index 0000000000000000000000000000000000000000..ba66887ac7b3953adfdfddc2c404e10eaa3a30fc
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/colors.json
@@ -0,0 +1,67 @@
+{
+  "status": "ok",
+  "settings": {
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json
new file mode 100644
index 0000000000000000000000000000000000000000..252b5d67ab29f903edfb8f9230688f0433b7e121
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json
@@ -0,0 +1,110 @@
+{
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+  "settings": {
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/fit.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/fit.json
new file mode 100644
index 0000000000000000000000000000000000000000..12733142baea7ba6923c4ac3e4139911bc5d045e
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/fit.json
@@ -0,0 +1,202 @@
+{
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+  "settings": {
+    "object": {
+      "name": "orange_round_belt",
+      "representation": "tube",
+      "fitter_source": "spline_estimation.round_belt_backend (accepted A/B priors)",
+      "dimension_source": "owner 2.95 mm cord radius (RP S-E, 2026-09-26)",
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+      "u_resolution": null,
+      "overlap_rule": "ring_separation",
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+    "reprojection": {
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+      "direction": "visible mask pixels to projected centerline",
+      "ribbon_twist_stage": null,
+      "mask": "accepted object outside hand/occluder union",
+      "view_aggregation": "equal view means",
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
new file mode 100644
index 0000000000000000000000000000000000000000..77a758f92c36f3790c19101a718711716d4bd603
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
@@ -0,0 +1,24 @@
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/inputs.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
new file mode 100644
index 0000000000000000000000000000000000000000..545879092701db42beb370a31f27a795f5a5fe64
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
@@ -0,0 +1,216 @@
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\ No newline at end of file
diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/review.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/review.json
new file mode 100644
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\ No newline at end of file
diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/tube.json b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/tube.json
new file mode 100644
index 0000000000000000000000000000000000000000..2b286ac35835ee85a33459bb88df9d19be46f8c0
--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/steps/tube.json
@@ -0,0 +1,60 @@
+{
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+      "winding_consistent": true,
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+  "code": {
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+}
\ No newline at end of file
diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz
new file mode 100644
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--- /dev/null
+++ b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz
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diff --git a/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz b/sessions/session_20260921_230550_636767/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz
new file mode 100644
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