// Gets the furthest point from the origin in this geometry
func (geometry *Geometry) MaximalPointFromGeometry() mgl32.Vec3 {
var longestSq float32
var longest *mgl32.Vec3
for i := 0; i < len(geometry.Indicies); i = i + 1 {
index := geometry.Indicies[i]
v := mgl32.Vec3{
geometry.Verticies[index*VertexStride],
geometry.Verticies[index*VertexStride+1],
geometry.Verticies[index*VertexStride+2],
}
if longest == nil || util.Vec3LenSq(v) > longestSq {
longestSq = util.Vec3LenSq(v)
longest = &v
}
}
if longest != nil {
return *longest
}
return mgl32.Vec3{}
}
// Converts a geometry directly into points (does threshold culling optimisation)
func PointsFromGeometry(geometry *renderer.Geometry, cullThreshold float32) *[]mgl32.Vec3 {
verticies := make([]mgl32.Vec3, 0, len(geometry.Indicies))
for i := 0; i < len(geometry.Indicies); i = i + 1 {
index := geometry.Indicies[i]
v := mgl32.Vec3{
geometry.Verticies[index*renderer.VertexStride],
geometry.Verticies[index*renderer.VertexStride+1],
geometry.Verticies[index*renderer.VertexStride+2],
}
//do culling
include := true
for _, vert := range verticies {
if util.Vec3LenSq(vert.Sub(v)) < cullThreshold*cullThreshold {
include = false
break
}
}
if include {
verticies = append(verticies, v)
}
}
return &verticies
}