| 423 | |
| 424 | template <typename T> |
| 425 | T Vector3<T>::angle(const Vector3<T> &v2) const |
| 426 | { |
| 427 | const T len = this->length() * v2.length(); |
| 428 | if (len <= 0) { |
| 429 | return 0.0f; |
| 430 | } |
| 431 | const T cosv = ((*this)*v2) / len; |
| 432 | if (cosv >= 1 || cosv <= -1) { |
| 433 | return 0.0f; |
| 434 | } |
| 435 | return acosF(cosv); |
| 436 | } |
| 437 | |
| 438 | // multiplication of transpose by a vector |
| 439 | template <typename T> |