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main.go
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main.go
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package main
import (
"log"
"math"
"github.com/unixpickle/model3d/model2d"
"github.com/unixpickle/model3d/model3d"
"github.com/unixpickle/model3d/render3d"
)
const (
// Between a size 7.5 and a size 8.
RingDiameter = 0.7
RingRadius = RingDiameter / 2
RingLength = 0.1
RingThickness = 0.06
// Controls how curved the ring is.
// Lower values mean more curvature.
RingCurveRadius = 0.5
HeartSpacing = 0.01
HeartWidth = 0.3
HeartHeight = HeartWidth * 456.0 / 512.0
EngraveDepth = 0.015
)
func main() {
solid := model3d.JoinedSolid{
RingSolid(),
NewHeartSolid(),
}
log.Println("Creating mesh...")
m := model3d.MarchingCubesSearch(solid, 0.0015, 8).Blur(-1, -1, -1, -1, -1)
log.Println("Eliminating co-planar...")
m = m.EliminateCoplanar(1e-8)
log.Println("Saving mesh...")
m.SaveGroupedSTL("ring.stl")
log.Println("Rendering...")
render3d.SaveRandomGrid("rendering.png", m, 3, 3, 300, nil)
}
func RingSolid() model3d.Solid {
min := model3d.XYZ(-(RingRadius + RingThickness), -(RingRadius + RingThickness), -RingLength/2)
return model3d.CheckedFuncSolid(min, min.Scale(-1), func(c model3d.Coord3D) bool {
rad := c.XY().Norm()
if rad < RingRadius || rad > RingRadius+RingThickness {
return false
}
thicknessDelta := RingCurveRadius * (1 - math.Sqrt(1-math.Pow(c.Z/RingCurveRadius, 2)))
if rad < RingRadius+thicknessDelta || rad > RingRadius+RingThickness-thicknessDelta {
return false
}
return true
})
}
type HeartSolid struct {
Outline model2d.Collider
Engraving model2d.Collider
}
func NewHeartSolid() *HeartSolid {
m := model2d.MustReadBitmap("heart.png", nil).FlipY().Mesh()
m = m.SmoothSq(10)
outline := model2d.MeshToCollider(m)
m = model2d.MustReadBitmap("letters.png", nil).FlipY().FlipX().Mesh()
m = m.SmoothSq(10)
engraving := model2d.MeshToCollider(m)
return &HeartSolid{
Outline: outline,
Engraving: engraving,
}
}
func (h *HeartSolid) Min() model3d.Coord3D {
return model3d.XYZ(-HeartWidth/2, RingRadius+HeartSpacing, -HeartHeight/2)
}
func (h *HeartSolid) Max() model3d.Coord3D {
return model3d.Coord3D{X: HeartWidth / 2, Y: RingRadius + RingThickness + EngraveDepth,
Z: HeartHeight / 2}
}
func (h *HeartSolid) Contains(c model3d.Coord3D) bool {
if !model3d.InBounds(h, c) {
return false
}
localCoord := model3d.Coord2D{
X: h.Outline.Max().X * (c.X - h.Min().X) / (h.Max().X - h.Min().X),
Y: h.Outline.Max().Y * (c.Z - h.Min().Z) / (h.Max().Z - h.Min().Z),
}
if !model2d.ColliderContains(h.Outline, localCoord, 0) {
return false
}
if c.Y < h.Max().Y-EngraveDepth {
return true
}
return !model2d.ColliderContains(h.Engraving, localCoord, 0)
}