openscad/BOSL2
1
0
Fork 0
mirror of https://github.com/revarbat/BOSL2.git synced 2025-09-01 14:32:36 +02:00
Code Issues Projects Releases Wiki Activity

add region centroid capability and consolidate into one centroid

Browse Source 
function for polygons, regions and VNFs.
Fix bug with anchors for linear_sweep (due to centerpoint issues)
Fix intersection anchors for vnfs when anchor vector intersects
in a path instead of a single point.
This commit is contained in:
Adrian Mariano
2021-10-20 22:44:55 -04:00
parent a7ca1b1b64
commit 76272d9d9a
10 changed files with 158 additions and 101 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
regions.scad
View File

@@ -390,7 +390,9 @@ function region_parts(region) =
// If called as a module, creates a polyhedron that is the linear extrusion of the given 2D region or path.
// If called as a function, returns a VNF that can be used to generate a polyhedron of the linear extrusion
// of the given 2D region or path. The benefit of using this, over using `linear_extrude region(rgn)` is
// that you can use `anchor`, `spin`, `orient` and attachments with it. Also, you can make more refined
// that you can use `anchor`, `spin`, `orient` and attachments with it. You can set `cp` to "mean", "centroid"
// or "box" to get different centerpoint computations, or you can give a custom vector centerpoint.
// Also, you can make more refined
// twisted extrusions by using `maxseg` to subsample flat faces.
// Arguments:
// region = The 2D [Region](regions.scad) or path that is to be extruded.
@@ -402,8 +404,9 @@ function region_parts(region) =
// scale = The amount to scale the shape, from bottom to top. Default: 1
// style = The style to use when triangulating the surface of the object. Valid values are `"default"`, `"alt"`, or `"quincunx"`.
// convexity = Max number of surfaces any single ray could pass through. Module use only.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `"origin"`
// anchor_isect = If true, anchoring it performed by finding where the anchor vector intersects the swept shape. Default: false
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// cp = Centerpoint for determining intersection anchors or centering the shape. Determintes the base of the anchor vector. Default: "centroid"
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Example: Extruding a Compound Region.
@@ -427,10 +430,9 @@ function region_parts(region) =
// mrgn = union(rgn1,rgn2);
// orgn = difference(mrgn,rgn3);
// linear_sweep(orgn,height=20,convexity=16) show_anchors();
module linear_sweep(region, height=1, center, twist=0, scale=1, slices, maxseg, style="default", convexity, anchor_isect=false, anchor, spin=0, orient=UP) {
module linear_sweep(region, height=1, center, twist=0, scale=1, slices, maxseg, style="default", convexity, anchor_isect=false, anchor, spin=0, orient=UP, cp="centroid") {
region = force_region(region);
dummy=assert(is_region(region),"Input is not a region");
cp = mean(pointlist_bounds(flatten(region)));
anchor = get_anchor(anchor, center, "origin", "origin");
vnf = linear_sweep(
region, height=height,
@@ -446,15 +448,15 @@ module linear_sweep(region, height=1, center, twist=0, scale=1, slices, maxseg,
function linear_sweep(region, height=1, center, twist=0, scale=1, slices,
maxseg, style="default", anchor_isect=false, anchor, spin=0, orient=UP) =
maxseg, style="default", cp="centroid", anchor_isect=false, anchor, spin=0, orient=UP) =
let(
region = force_region(region)
)
assert(is_region(region), "Input is not a region")
let(
anchor = get_anchor(anchor,center,BOT,BOT),
anchor = get_anchor(anchor,center,"origin","origin"),
regions = region_parts(region),
cp = mean(pointlist_bounds(flatten(region))),
// cp = mean(pointlist_bounds(flatten(region))),
slices = default(slices, floor(twist/5+1)),
step = twist/slices,
hstep = height/slices,