dotSCAD/docs/lib3x-sf_solidifyT.md

# sf_solidifyT

It solidifies two surfaces with triangular mesh. 

**Since:** 3.1

## Parameters

- `points1` : A list of `[x, y, z]`s.
- `points2` : A list of `[x, y, z]`s.
- `triangles` : Determine which points are connected by an edge. All triangles have points in the same direction, counter-clockwise. See examples below.

## Examples

    use <triangle/tri_delaunay.scad>;
    use <surface/sf_solidifyT.scad>;

    points = [for(i = [0:50]) rands(-300, 300, 2)]; 
    triangles = tri_delaunay(points);

    pts = [for(p = points) [p.x, p.y, rands(100, 150, 1)[0]]];
    pts2 = [for(p = pts) [p.x, p.y, p.z - 100]];

    sf_solidifyT(pts, pts2, triangles = triangles);	

![sf_solidifyT](images/lib3x-sf_solidifyT-1.JPG)

    use <triangle/tri_delaunay.scad>;
    use <surface/sf_solidifyT.scad>;

    thickness = .2;
    a_step = 15;
    r_step = 0.2;
    scale = 100;

    function f(x, y) = (y ^ 2 - x ^ 2) / 4;

    pts2d = [
        for(a = [a_step:a_step:360], r = [r_step:r_step:2])
        let(
            x = r * cos(a), 
            y = r * sin(a)
        )
        [x, y] 
    ];

    points1 = [for(p = pts2d) scale * [p.x, p.y, f(p.x, p.y)]];
    points2 = [for(p = points1) [p.x, p.y, p.z - scale * thickness]];
    triangles = tri_delaunay(pts2d);

    sf_solidifyT(points1, points2, triangles);

![sf_solidifyT](images/lib3x-sf_solidifyT-2.JPG)