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62 lines
1.7 KiB
Markdown
62 lines
1.7 KiB
Markdown
# sf_splines
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Given a set of control points and spline functions, the `sf_splines` function returns surface points.
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**Since:** 3.1
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## Parameters
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- `ctrl_pts` : A set of control points. See examples below.
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- `row_spline` : The spline function for row points.
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- `column_spline` : The spline function for columns points. Default to `row_spline`.
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## Examples
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If you want to make a bezier surface:
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use <bezier_curve.scad>;
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use <surface/sf_splines.scad>;
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use <surface/sf_thicken.scad>;
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ctrl_pts = [
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[[0, 0, 20], [60, 0, -35], [90, 0, 60], [200, 0, 5]],
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[[0, 50, 30], [100, 60, -25], [120, 50, 120], [200, 50, 5]],
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[[0, 100, 0], [60, 120, 35], [90, 100, 60], [200, 100, 45]],
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[[0, 150, 0], [60, 150, -35], [90, 180, 60], [200, 150, 45]]
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];
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thickness = 2;
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t_step = 0.05;
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bezier = function(points) bezier_curve(t_step, points);
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sf_thicken(sf_splines(ctrl_pts, bezier), thickness);
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The following figure shows controll points and bazier curves around the surface.
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If you want to make a bspline surface:
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use <bspline_curve.scad>;
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use <surface/sf_thicken.scad>;
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use <surface/sf_splines.scad>;
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ctrl_pts = [
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[[0, 0, 20], [60, 0, -35], [90, 0, 60], [200, 0, 5]],
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[[0, 50, 30], [100, 60, -25], [120, 50, 120], [200, 50, 5]],
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[[0, 100, 0], [60, 120, 35], [90, 100, 60], [200, 100, 45]],
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[[0, 150, 0], [60, 150, -35], [90, 180, 60], [200, 150, 45]]
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];
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thickness = 2;
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t_step = 0.05;
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degrees = 2;
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bspline = function(points) bspline_curve(t_step, degrees, points);
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sf_thicken(sf_splines(ctrl_pts, bspline), thickness);
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