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doc tweak

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Adrian Mariano
2022-11-02 22:04:18 -04:00
parent f035df980a
commit cc556dab8e
1 changed files with 6 additions and 1 deletions
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7
transforms.scad
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@@ -1372,6 +1372,11 @@ function is_2d_transform(t) = // z-parameters are zero, except we allow t[2][
// . // .
// Any other combination of matrices will produce an error, including acting with a 2D matrix (3x3) on 3D data. // Any other combination of matrices will produce an error, including acting with a 2D matrix (3x3) on 3D data.
// The output of apply is always the same dimension as the input—projections are not supported. // The output of apply is always the same dimension as the input—projections are not supported.
// .
// Note that a matrix with a negative determinant such as any mirror reflection flips the orientation of faces.
// If the transform matrix is square then apply() checks the determinant and if it is negative, apply() reverses the face order so that
// the transformed VNF has faces with the same winding direction as the original VNF. This adjustment applies
// only to VNFs, not to beziers or point lists.
// Arguments: // Arguments:
// transform = The 2D (3x3 or 2x3) or 3D (4x4 or 3x4) transformation matrix to apply. // transform = The 2D (3x3 or 2x3) or 3D (4x4 or 3x4) transformation matrix to apply.
// points = The point, point list, bezier patch, or VNF to apply the transformation to. // points = The point, point list, bezier patch, or VNF to apply the transformation to.
@@ -1395,7 +1400,7 @@ function is_2d_transform(t) = // z-parameters are zero, except we allow t[2][
// stroke(path2,closed=true); // stroke(path2,closed=true);
function apply(transform,points) = function apply(transform,points) =
points==[] ? [] points==[] ? []
: is_vector(points) ? _apply(transform, [points])[0] // point : is_vector(points) ? _apply(transform, [points])[0] // point
: is_vnf(points) ? // vnf : is_vnf(points) ? // vnf
let( let(
newvnf = [_apply(transform, points[0]), points[1]], newvnf = [_apply(transform, points[0]), points[1]],