31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
# Tip Model
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Generate a synthetic AFM tip model DATA_FIELD. The input field sets the pixel size for the tip. The apex (centre pixel) is the maximum value; edges are shifted to zero. Equivalent to gwy_tip_model_preset_create (tip.c / tip_model.c).
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| field | DATA_FIELD | Yes | Reference field that sets the tip pixel size |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| tip | DATA_FIELD | Synthetic tip shape field |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| shape | dropdown | parabola | Tip geometry: parabola (paraboloid with apex radius R), cone (sphere-capped cone), or sphere (ball-on-stick) |
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| radius | FLOAT | 10 nm | Apex radius of curvature in metres (1e-10 to 1e-6) |
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| half_angle | FLOAT | 20.0 | Half-cone angle from the tip axis in degrees for the cone shape (1–89°) |
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| n_pixels | INT | 65 | Side length of the square tip grid in pixels (odd values only, 3–511) |
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## Limitations
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- half_angle is only used for the cone shape.
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- The tip grid must be smaller than or equal to the image size for Tip Deconvolution to work correctly.
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- Large n_pixels values produce large tip grids that make deconvolution slow.
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