func (ff frustum) Contains(bb gfx.Boundable) bool {
f := math.Mat4(ff)
b := bb.Bounds()
// Every corner of the 3D rectangle must be in the frustum -- thus we can
// say that if no corner is in the frustum, the rectangle is not contained.
var inside bool
for _, corner := range b.Corners() {
if _, inside = f.Project(corner); !inside {
return false
}
}
return true
}
func (ff frustum) Intersects(bb gfx.Boundable) bool {
f := math.Mat4(ff)
b := bb.Bounds()
// If any single corner of the 3D rectangle is in the frustum, then it is
// intersecting.
var inside bool
for _, corner := range b.Corners() {
if _, inside = f.Project(corner); inside {
return true
}
}
return false
}