Add meshrepeat utility

cmd/meshrepeat/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"log"
+	"math"
+
+	. "github.com/fogleman/fauxgl"
+	kingpin "gopkg.in/alecthomas/kingpin.v2"
+)
+
+var (
+	// scale  = kingpin.Flag("scale", "Scale factor.").Short('s').Required().Float64()
+	count  = kingpin.Flag("count", "Number of repeats.").Short('n').Required().Int()
+	axisX  = kingpin.Flag("x", "Use X axis.").Short('x').Bool()
+	axisY  = kingpin.Flag("y", "Use Y axis.").Short('y').Bool()
+	axisZ  = kingpin.Flag("z", "Use Z axis.").Short('z').Bool()
+	rows   = kingpin.Flag("rows", "Number of rows.").Short('r').Int()
+	output = kingpin.Flag("output", "Output STL file.").Short('o').Required().String()
+	file   = kingpin.Arg("file", "Model to repeat.").Required().ExistingFile()
+)
+
+func main() {
+	kingpin.Parse()
+
+	mesh, err := LoadMesh(*file)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	maxSize := mesh.BoundingBox().Size()
+	maxSize = maxSize.MulScalar(2)
+
+	numRows := int(math.Ceil(math.Sqrt(float64(*count))))
+	if *rows > 0 {
+		numRows = *rows
+	}
+
+	combined := NewTriangleMesh(nil)
+	for i := 0; i < *count; i++ {
+		row := i / numRows
+		col := i % numRows
+		var x, y, z float64
+		if *axisX {
+			y = float64(row) * maxSize.Y
+			z = float64(col) * maxSize.Z
+		} else if *axisY {
+			x = float64(row) * maxSize.X
+			z = float64(col) * maxSize.Z
+		} else {
+			x = float64(row) * maxSize.X
+			y = float64(col) * maxSize.Y
+		}
+		m := mesh.Copy()
+		m.MoveTo(V(x, y, z), V(0.5, 0.5, 0.5))
+		combined.Add(m)
+	}
+
+	combined.MoveTo(V(0, 0, 0), V(0.5, 0.5, 0))
+
+	combined.SaveSTL(*output)
+}