Merge pull request #1513 from adrianVmariano/master

ghosting, etc

attachments.scad

@@ -39,7 +39,9 @@ $edge_length = undef;
 $tags_shown = "ALL";
 $tags_hidden = [];
 
-
+$ghost_this=false;
+$ghost=false;
+$ghosting=false;    // Ghosting is in effect, so don't apply it again
 
 _ANCHOR_TYPES = ["intersect","hull"];
 
@@ -3104,31 +3106,32 @@ module attachable(
         $attach_alignment=undef;
         if (expose_tags || _is_shown()){
             if (!keep_color)
-                _color($color) children(0);
-            else {
-                $save_color=undef; // Force color_this() color in effect to persist for the entire object
+                _color($color)
+                    if (($ghost || $ghost_this) && !$ghosting)
+                        %union(){
+                           $ghosting=true;
                            children(0);
                         }
+                    else children(0);
+            else {
+                $save_color=undef; // Force color_this() color in effect to persist for the entire object
+                    if (($ghost || $ghost_this) && !$ghosting)
+                        %union(){
+                           $ghosting=true;
+                           children(0);
                         }
-        if (is_def($save_tag) && is_def($save_color)){
-            $tag=$save_tag;
-            $save_tag=undef;
-            $color=$save_color;    // Revert to the color before color_this() call
-            $save_color=undef;
+                    else children(0);
+            }
+        }
+        let(
+            $ghost_this=false,
+            $tag=default($save_tag,$tag),
+            $save_tag=undef,
+            $color=default($save_color,$color),
+            $save_color=undef
+        )
         children(1);
    }
-        else if (is_def($save_color)) {
-            $color=$save_color;    // Revert to the color before color_this() call
-            $save_color=undef;
-            children(1);
-        }
-        else if (is_def($save_tag)) {
-            $tag=$save_tag;
-            $save_tag=undef;
-            children(1);
-        }
-        else children(1);
-    }
 }
 
 // Function: reorient()
@@ -3726,7 +3729,7 @@ function _attach_transform(anchor, spin, orient, geom, p) =
         spin=default(spin,0),
         orient=default(orient,UP),
         two_d = _attach_geom_2d(geom),
-        m = ($attach_to != undef) ?   // $attach_to is the attachment point on this object
+        m = is_def($attach_to) ?   // $attach_to is the attachment point on this object
               (                       // which will attach to the parent
                    let(                           
                         anch = _find_anchor($attach_to, geom),
@@ -3736,7 +3739,6 @@ function _attach_transform(anchor, spin, orient, geom, p) =
                             : _find_anchor(_make_anchor_legal($anchor_override,geom),geom)[1]
                    )
                    two_d?
-                 assert(is_num(spin))
                      affine3d_zrot(spin)  
                         * rot(to=FWD, from=point3d(anch[2])) 
                         * affine3d_translate(point3d(-pos))
@@ -3753,17 +3755,14 @@ function _attach_transform(anchor, spin, orient, geom, p) =
                        : _make_anchor_legal(rot(spin, from=UP,to=orient,reverse=true,p=$attach_alignment),geom),
                 pos = _find_anchor(anchor, geom)[1]
             )
-            two_d? 
-                assert(is_num(spin))
-                affine3d_zrot(spin) * affine3d_translate(point3d(-pos))
+            two_d? affine3d_zrot(spin) * affine3d_translate(point3d(-pos))
             :
                 let(
                     axis = vector_axis(UP,orient),    // Returns BACK if orient is UP
                     ang = vector_angle(UP,orient)
                 )
                 affine3d_rot_by_axis(axis,ang) 
-                    * ( is_num(spin)? affine3d_zrot(spin)  
-                                    : affine3d_zrot(spin.z) * affine3d_yrot(spin.y) * affine3d_xrot(spin.x))
+                    * affine3d_zrot(spin)  
                     * affine3d_translate(point3d(-pos))
     )
     is_undef(p)? m
@@ -3926,7 +3925,7 @@ function _find_anchor(anchor, geom)=
                  : oang        // face anchors point UP/BACK
         ) [anchor, final_pos, final_dir, default(override[2],spin),
            if (is_def(edgeang)) [["edge_angle",edgeang],["edge_length",edgelen], ["vec", endvecs]]]
-    ) : type == "conoid"? ( //r1, r2, l, shift
+    ) : type == "conoid"? ( //r1, r2, l, shift, axis
         let(
             rr1=geom[1],
             rr2=geom[2],

color.scad

@@ -161,6 +161,50 @@ module color_overlaps(color="red") {
     %children();
 }
 
+// Module: ghost()
+// Synopsis: Sets transparency for attachable children and their descendents.
+// SynTags: Trans
+// Topics: Attachments
+// See Also: ghost_this(), recolor(), color_this()
+// Usage:
+//   ghost([ghost]) CHILDREN;
+// Description:
+//   Sets the transparency for the attachable children and their descendents until another {{ghost()}} or {{ghost_this()}}.
+//   By default, turns transparency on.  Give the `false` parameter to disable transparency.
+//   Do not mix this with user supplied `%` operators anywhere in the geometry tree.  
+// Arguments:
+//   ghost = If true set the descendents to be transparent; if false, disable transparency.  Default: true
+// Example(3D):
+//   ghost() cuboid(10)
+//     ghost(false) cuboid(5);
+function ghost(ghost) = no_function("ghost");
+module ghost(ghost=true)
+{
+   $ghost=ghost;
+   children();
+}
+
+
+// Module: ghost_this()
+// Synopsis: Makes the children at a single level transparent. 
+// SynTags: Trans
+// Topics: Attachments
+// See Also: ghost(), recolor(), color_this()
+// Usage:
+//   ghost_this() CHILDREN;
+// Description:
+//   Makes the children transparent for one level, reverting to the previous transparency state for further descendents.  
+//   This works only with attachables and you cannot give the `%` operator anywhere in the geometry tree.  
+// Example(3D):
+//   ghost_this() cuboid(10)
+//      cuboid(5);
+function ghost_this() = no_function("ghost_this");
+module ghost_this()
+{
+   $ghost_this=true;
+   children();
+}
+
 
 // Section: Colorspace Conversion
 

distributors.scad

@@ -654,6 +654,7 @@ module grid_copies(spacing, n, size, stagger=false, inside=undef, nonzero)
         is_vector(n)? assert(len(n)==2) n :
         size!=undef && spacing!=undef? v_floor(v_div(size,spacing))+[1,1] :
         [2,2];
+    dummy2 = assert(is_int(n[0]) && is_int(n[1]), "The number of rows/columns must be an integer");
     offset = v_mul(spacing, n-[1,1])/2;
 
     poslist = 

lists.scad

@@ -304,7 +304,7 @@ function last(list) =
 // Example:
 //   hlist1 = list_head(["foo", "bar", "baz"]);  // Returns: ["foo", "bar"]
 //   hlist2 = list_head(["foo", "bar", "baz"], -3); // Returns: ["foo"]
-//   hlist3 = list_head(["foo", "bar", "baz"], 2);  // Returns: ["foo","bar"]
+//   hlist3 = list_head(["foo", "bar", "baz"], 1);  // Returns: ["foo","bar"]
 //   hlist4 = list_head(["foo", "bar", "baz"], -5); // Returns: []
 //   hlist5 = list_head(["foo", "bar", "baz"], 5);  // Returns: ["foo","bar","baz"]
 function list_head(list, to=-2) =

tutorials/Transforms.md

@@ -219,8 +219,9 @@ color("blue",0.25) down(20) cube([40,40,0.1], center=true);
 ```
 
 
-## Skewing
-One transform that OpenSCAD does not perform natively is skewing.
+## Skewing / Shearing
+One transform that OpenSCAD does not perform natively is skewing, also
+known as shearing.  
 BOSL2 provides the `skew()` command for that.  You give it multipliers
 for the skews you want to perform.  The arguments used all start with `s`,
 followed by the axis you want to skew along, followed by the axis that