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add show_plane(), bug fix for is_one_line

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Adrian Mariano
2025-03-24 21:16:43 -04:00
parent 373ac0d5d4
commit 5365550b8d
1 changed files with 45 additions and 2 deletions
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47
geometry.scad
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@@ -41,9 +41,10 @@ function _is_point_on_line(point, line, bounded=false, eps=EPSILON) =
v1 = (line[1]-line[0]),
v0 = (point-line[0]),
t = v0*v1/(v1*v1),
bounded = force_list(bounded,2)
bounded = force_list(bounded,2),
norm_crossprod = len(v1)==2 ? abs(cross(v0,v1)) : norm(cross(v0,v1))
)
abs(cross(v0,v1))<=eps*norm(v1)
norm_crossprod <= eps*norm(v1)
&& (!bounded[0] || t>=-eps)
&& (!bounded[1] || t<1+eps) ;
@@ -904,6 +905,48 @@ function _is_point_above_plane(plane, point) =
point_plane_distance(plane, point) > EPSILON;
// Module: show_plane()
// Summary: Display (part of) a plane
// SynTags: Geom
// Topics: Planes
// Usage:
// show_plane(plane, size, [offset]) [ATTACHMENTS];
// Description:
// Display a rectangular portion of the specified plane for debugging or visualization purposes.
// The size parameter specifies the size of the plane when projected along the coordinate axis that is closest to
// the plane's normal vector. The offset parameter will shift the plane location perpendicular to the normal vector.
// This object is a non-manifold VNF (it has edges) so it will not render.
// Arguments:
// plane = Plane to display
// size = scalar or 2-vector size parameter
// offset = scalar of 2-vector offset
// Example(3D):
// sphere(r=15,$fn=48);
// plane = plane_from_normal([2,-3,9],[4,-5,12]);
// %show_plane(plane, [35,25], [4,-7]);
module show_plane(plane, size, offset=0)
{
size = force_list(size,2);
offset = force_list(offset, 2, 0);
checks =
assert(is_vector(size,2), "The size parameter must be a scalar or 2-vector")
assert(is_vector(offset,2), "The offset parameter must be a scalar or 2-vector");
pts = move(offset,rect(size));
axes = [UP, BACK, RIGHT];
n = plane_normal(plane);
ang = [for(v=axes) abs(plane_line_angle(plane, [CTR,v]))];
axis = axes[max_index(ang)];
face = [for(pt=pts)
axis==UP? [pt.x,pt.y,(plane[3]-plane.x*pt.x-plane.y*pt.y)/plane.z]
: axis==BACK? [pt[0],(plane[3]-plane.x*pt[0]-plane.z*pt[1])/plane.y,pt[1]]
: [(plane[3]-plane.y*pt[0]-plane.z*pt[1])/plane.x,pt[0],pt[1]]
];
vnf = [face, [count(face)]];
vnf_polyhedron(vnf) children();
}
// Section: Circle Calculations