| Name | ID | Description | Type |
|---|---|---|---|
| Surface | S | Base surface | Surface |
| Point | uv | {uv} coordinate to evaluate | Point |
| Name | ID | Description | Type |
|---|---|---|---|
| Point | P | Surface point at {uv} coordinate | Point |
| First circle | C1 | First osculating circle | Curve |
| Second circle | C2 | Second osculating circle | Curve |
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