Method Area

geometry/geometry.go:361–381

Area returns the surface area. NOTE: This only works for triangle-based meshes.

()

// Area returns the surface area.
// NOTE: This only works for triangle-based meshes.
func (g *Geometry) Area() float32 {

	// If valid, return its value
	if g.areaValid {
		return g.area
	}

	// Reset area
	g.area = 0

	// Sum area of all triangles
	g.ReadFaces(func(vA, vB, vC math32.Vector3) bool {
		vA.Sub(&vC)
		vB.Sub(&vC)
		vC.CrossVectors(&vA, &vB)
		g.area += vC.Length() / 2.0
		return false
	})
	g.areaValid = true
	return g.area
}

// Volume returns the volume.
// NOTE: This only works for closed triangle-based meshes.