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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/model3d"
"github.com/unixpickle/model3d/render3d"
)
const Thickness = 0.1
func main() {
polytope := model3d.NewConvexPolytopeRect(model3d.XYZ(-1, -1, -1), model3d.XYZ(1, 1, 1))
for _, x := range []float64{-1, 1} {
for _, y := range []float64{-1, 1} {
for _, z := range []float64{-1, 1} {
vec := model3d.XYZ(x, y, z)
polytope = append(polytope, &model3d.LinearConstraint{
Normal: vec,
Max: 2,
})
}
}
}
mesh := polytope.Mesh()
// Remove top face.
mesh.Iterate(func(t *model3d.Triangle) {
if t.Normal().Z > 0.99 {
mesh.Remove(t)
}
})
// Add inner mesh.
mesh.AddMesh(mesh.Scale(1 - Thickness))
// Connect openings of inner and outer meshes.
mesh.Iterate(func(t *model3d.Triangle) {
for _, seg := range t.Segments() {
if len(mesh.Find(seg[0], seg[1])) == 1 && seg[0].Z > 0.999 {
// This segment needs a connection and is on
// the larger model.
inner0 := seg[0].Scale(1 - Thickness)
inner1 := seg[1].Scale(1 - Thickness)
mesh.AddQuad(seg[0], seg[1], inner1, inner0)
}
}
})
// We didn't pay attention to normals when we connected
// the inner and outer meshes, so we must repair them.
mesh, _ = mesh.RepairNormals(1e-5)
log.Println("Saving mesh...")
mesh.SaveGroupedSTL("cut_cube.stl")
log.Println("Rendering...")
SaveRendering(mesh)
}
func SaveRendering(mesh *model3d.Mesh) {
obj := &render3d.ColliderObject{
Collider: model3d.MeshToCollider(mesh),
Material: &render3d.PhongMaterial{
Alpha: 10.0,
DiffuseColor: render3d.NewColor(0.4),
SpecularColor: render3d.NewColor(0.25),
},
}
light := render3d.JoinAreaLights(
render3d.NewSphereAreaLight(&model3d.Sphere{
Center: model3d.XYZ(-5, -10, 10),
Radius: 1.0,
}, render3d.NewColor(120.0)),
render3d.NewSphereAreaLight(&model3d.Sphere{
Center: model3d.XYZ(5, -10, 10),
Radius: 1.0,
}, render3d.NewColor(120.0)),
)
camera := render3d.NewCameraAt(
model3d.XYZ(2, -4, 4).Scale(0.8),
model3d.Coord3D{},
math.Pi/3.6,
)
renderer := &render3d.BidirPathTracer{
Camera: camera,
Light: light,
MaxDepth: 10,
MinDepth: 2,
NumSamples: 1000,
RouletteDelta: 0.2,
Antialias: 1.0,
PowerHeuristic: 2,
}
img := render3d.NewImage(400, 400)
renderer.Render(img, render3d.JoinedObject{obj, light})
img.Save("rendering.png")
}