Add box struct

box.go

@@ -0,0 +1,98 @@
+package objects
+
+import (
+	"github.com/deadsy/sdfx/sdf"
+	"math"
+)
+
+type BoxParams struct {
+	Size           sdf.V3  // internal box size
+	Wall           float64 // wall thickness
+	BottomTopRatio float64 // ratio between the height of the top and the bottom
+	CornerRadius   float64 // radius of rounded corners
+	Taper          float64 // angle of split
+	ClosingHeight  float64 // height of the closing
+	Margin		   float64 // Margin for closing
+	Text           string
+}
+
+func Box3D(k *BoxParams) (top sdf.SDF3, bottom sdf.SDF3, err error) {
+	top, err = TopBox3D(k)
+	bottom, err = TopBox3D(k)
+	if err != nil {
+		return
+	}
+	return
+}
+
+func baseBox3D(k *BoxParams) (sdf.SDF3, error) {
+	box, err := sdf.Box3D(k.Size.AddScalar(k.Wall*2), k.CornerRadius)
+	if err != nil {
+		return nil, err
+	}
+	return box, nil
+}
+
+func TopBox3D(k *BoxParams) (top sdf.SDF3, err error) {
+	box, err := baseBox3D(k)
+	if err != nil {
+		return
+	}
+	a := sdf.V3{X: 0, Y: 0, Z: 0.5 - k.BottomTopRatio}.Mul(k.Size).Add(sdf.V3{X: 0, Y: 0, Z: k.ClosingHeight / 2})
+	n := sdf.V3{X: 0, Y: 0, Z: 1}
+	top = sdf.Cut3D(box, a, n)
+	closing, err := InnerClosing(k)
+	if err != nil {
+		return
+	}
+	top = sdf.Union3D(top,closing)
+	return
+}
+
+func BottomBox3D(k *BoxParams) (bottom sdf.SDF3, err error) {
+	box, err := baseBox3D(k)
+	if err != nil {
+		return
+	}
+	a := sdf.V3{X: 0, Y: 0, Z: 0.5 - k.BottomTopRatio}.Mul(k.Size).Add(sdf.V3{X: 0, Y: 0, Z: k.ClosingHeight / 2})
+	n := sdf.V3{X: 0, Y: 0, Z: -1}
+	bottom = sdf.Cut3D(box, a, n)
+	closing, err := InnerClosing(k)
+	scale := k.Size.Add(sdf.V3{X: k.Margin, Y: k.Margin, Z: 0}).Div(k.Size)
+	closing = sdf.Transform3D(closing, sdf.Scale3d(scale))
+	if err != nil {
+		return
+	}
+	bottom = sdf.Difference3D(bottom,closing)
+	return
+}
+
+func InnerClosing(k *BoxParams) (closing sdf.SDF3, err error) {
+	offset := math.Tan(k.Taper) * k.ClosingHeight / 2
+	size := sdf.V2{X: k.Size.X, Y: k.Size.Y}
+	s1 := sdf.Box2D(size.AddScalar(k.Wall-offset), k.CornerRadius)
+	s2 := sdf.Box2D(size.AddScalar(k.Wall+offset), k.CornerRadius)
+	closing, err = sdf.Loft3D(s1, s2, k.ClosingHeight, 0)
+	if err != nil {
+		return
+	}
+	closing = sdf.Transform3D(closing, sdf.Translate3d(sdf.V3{0,0,0.5-k.BottomTopRatio}.Mul(k.Size)))
+	return
+}
+
+func OuterClosing(k *BoxParams) (closing sdf.SDF3, err error) {
+	s0, err := InnerClosing(k)
+	if err != nil {
+		return
+	}
+	s1, err := baseBox3D(k)
+	if err != nil {
+		return
+	}
+	a := sdf.V3{0, 0, k.ClosingHeight / 2}
+	n := sdf.V3{0, 0, -1}
+	s1 = sdf.Cut3D(s1, a, n)
+	s1 = sdf.Cut3D(s1, a.Neg(), n.Neg())
+	closing = sdf.Difference3D(s1, s0)
+	return
+}

box_test.go

@@ -0,0 +1,51 @@
+package objects
+
+import (
+	"github.com/deadsy/sdfx/render"
+	"github.com/deadsy/sdfx/sdf"
+	"testing"
+)
+
+var k = BoxParams{
+	Size:           sdf.V3{X: 40, Y: 40, Z: 40},
+	CornerRadius:   6.0,
+	BottomTopRatio: 0.3,
+	Wall:           3,
+	ClosingHeight:  4,
+	Taper:          0.2,
+	Margin:         0.2,
+}
+
+func TestBottomBox3D(t *testing.T) {
+	bottom, err := BottomBox3D(&k)
+	if err != nil {
+		t.Failed()
+		return
+	}
+	render.RenderSTL(bottom, 400, "test_box_bottom.stl")
+}
+
+func TestTopBox3D(t *testing.T) {
+	top, err := TopBox3D(&k)
+	if err != nil {
+		t.Failed()
+		return
+	}
+	render.RenderSTL(top, 100, "test_box_top.stl")
+}
+
+func TestInnerClosing(t *testing.T) {
+	stl, err := InnerClosing(&k)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl, 100, "inner_closing.stl")
+}
+
+func TestOuterClosing(t *testing.T) {
+	stl, err := OuterClosing(&k)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl, 100, "outer_closing.stl")
+}

go.mod

@@ -0,0 +1,5 @@
+module git.wtrh.nl/3D-models/objects
+
+go 1.16
+
+require github.com/deadsy/sdfx v0.0.0-20210428225541-69bac33c47f0

go.sum

@@ -0,0 +1,19 @@
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