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
}
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
}