示例#1
0
func newSurfaceBoundingBoxTree(surface *verb.NurbsSurface, splitV bool, knotTolU, knotTolV *float64) *surfaceBoundingBoxTree {
	this := new(surfaceBoundingBoxTree)
	this.surface = surface

	knotsU, knotsV := KnotVec(surface.KnotsU()), KnotVec(surface.KnotsV())

	var _knotTolU float64
	if knotTolU == nil {
		_knotTolU = knotsU.Domain() / 16.0
	} else {
		_knotTolU = *knotTolU
	}

	var _knotTolV float64
	if knotTolV == nil {
		_knotTolV = knotsV.Domain() / 16.0
	} else {
		_knotTolV = *knotTolV
	}

	var divisible bool
	if splitV {
		divisible = knotsV.Domain() > _knotTolV
	} else {
		divisible = knotsU.Domain() > _knotTolU
	}

	if !divisible {
		return this
	}

	var min, max float64
	if splitV {
		min = knotsV[0]
		max = knotsV[len(knotsV)-1]
	} else {
		min = knotsU[0]
		max = knotsU[len(knotsU)-1]
	}

	dom := max - min
	pivot := (min+max)/2.0 + dom*0.1*rand.Float64()

	srf0, srf1 := this.surface.Split(pivot, splitV)

	this.children = [2]BoundingBoxTree{
		newSurfaceBoundingBoxTree(srf0, !splitV, &_knotTolU, &_knotTolV),
		newSurfaceBoundingBoxTree(srf1, !splitV, &_knotTolU, &_knotTolV),
	}

	return this
}
示例#2
0
func newLazySurfaceBoundingBoxTree(surface *verb.NurbsSurface, splitV bool, knotTolU, knotTolV *float64) *lazySurfaceBoundingBoxTree {
	this := lazySurfaceBoundingBoxTree{
		surface: surface,
		knotsU:  surface.KnotsU(),
		knotsV:  surface.KnotsV(),
		splitV:  splitV, // default: false
	}

	if knotTolU == nil {
		this.knotTolU = this.knotsU.Domain() / 16
	} else {
		this.knotTolU = *knotTolU
	}
	if knotTolV == nil {
		this.knotTolV = this.knotsV.Domain() / 16
	} else {
		this.knotTolV = *knotTolV
	}

	return &this
}