Repository: godotengine/godot
File: scene/resources/animation.cpp (C++)

Code before:
		} else {
			i++;
		}
	}

	if (rt->rotations.size() == 2) {
		if ((rt->rotations[0].value - rt->rotations[1].value).length() < p_allowed_precision_error) {
			rt->rotations.remove_at(1);
		}
	}
}

void Animation::_scale_track_optimize(int p_idx, real_t p_allowed_velocity_err, real_t p_allowed_angular_err, real_t p_allowed_precision_error) {
	ERR_FAIL_INDEX(p_idx, tracks.size());
	ERR_FAIL_COND(tracks[p_idx]->type != TYPE_SCALE_3D);
	ScaleTrack *st = static_cast<ScaleTrack *>(tracks[p_idx]);
	bool p_is_nearest = false;
	int i = 0;
	while (i < st->scales.size() - 2) {
		TKey<Vector3> t0 = st->scales[i];
		TKey<Vector3> t1 = st->scales[i + 1];
		TKey<Vector3> t2 = st->scales[i + 2];
		if (track_get_interpolation_type(i) == Animation::INTERPOLATION_NEAREST) {
			p_is_nearest = true;
		}
		bool erase = _vector3_track_optimize_key(t0, t1, t2, p_allowed_velocity_err, p_allowed_angular_err, p_allowed_precision_error, p_is_nearest);
		if (erase) {
			st->scales.remove_at(i + 1);
		} else {
			i++;
		}
	}

	if (st->scales.size() == 2) {
		if ((st->scales[0].value - st->scales[1].value).length() < p_allowed_precision_error) {
			st->scales.remove_at(1);
		}
	}
}

void Animation::_blend_shape_track_optimize(int p_idx, real_t p_allowed_velocity_err, real_t p_allowed_precision_error) {
	ERR_FAIL_INDEX(p_idx, tracks.size());
	ERR_FAIL_COND(tracks[p_idx]->type != TYPE_BLEND_SHAPE);
	BlendShapeTrack *bst = static_cast<BlendShapeTrack *>(tracks[p_idx]);
	bool p_is_nearest = false;
	int i = 0;
	while (i < bst->blend_shapes.size() - 2) {
		TKey<float> t0 = bst->blend_shapes[i];
		TKey<float> t1 = bst->blend_shapes[i + 1];
		TKey<float> t2 = bst->blend_shapes[i + 2];


Review comment (performance):
```suggestion
		bool erase = _vector3_track_optimize_key(t0, t1, t2, p_allowed_velocity_err, p_allowed_angular_err, p_allowed_precision_error, track_get_interpolation_type(i) == Animation::INTERPOLATION_NEAREST);
```

Code after:
		TKey<Quaternion> t2 = rt->rotations[i + 2];
		bool erase = _quaternion_track_optimize_key(t0, t1, t2, p_allowed_velocity_err, p_allowed_angular_err, p_allowed_precision_error, is_nearest);
		if (erase) {
			rt->rotations.remove_at(i + 1);
		} else {
			i++;
		}
	}

	if (rt->rotations.size() == 2) {
		if ((rt->rotations[0].value - rt->rotations[1].value).length() < p_allowed_precision_error) {
			rt->rotations.remove_at(1);
		}
	}
}

void Animation::_scale_track_optimize(int p_idx, real_t p_allowed_velocity_err, real_t p_allowed_angular_err, real_t p_allowed_precision_error) {
	ERR_FAIL_INDEX(p_idx, tracks.size());
	ERR_FAIL_COND(tracks[p_idx]->type != TYPE_SCALE_3D);
	bool is_nearest = false;
	if (tracks[p_idx]->interpolation == INTERPOLATION_NEAREST) {
		is_nearest = true;
	} else if (tracks[p_idx]->interpolation != INTERPOLATION_LINEAR) {
		return;
	}
	ScaleTrack *st = static_cast<ScaleTrack *>(tracks[p_idx]);
	int i = 0;
	while (i < st->scales.size() - 2) {
		TKey<Vector3> t0 = st->scales[i];
		TKey<Vector3> t1 = st->scales[i + 1];
		TKey<Vector3> t2 = st->scales[i + 2];
		bool erase = _vector3_track_optimize_key(t0, t1, t2, p_allowed_velocity_err, p_allowed_angular_err, p_allowed_precision_error, is_nearest);
		if (erase) {
			st->scales.remove_at(i + 1);
		} else {
			i++;
		}
	}

	if (st->scales.size() == 2) {
		if ((st->scales[0].value - st->scales[1].value).length() < p_allowed_precision_error) {
			st->scales.remove_at(1);
		}
	}
}

void Animation::_blend_shape_track_optimize(int p_idx, real_t p_allowed_velocity_err, real_t p_allowed_precision_error) {
	ERR_FAIL_INDEX(p_idx, tracks.size());
	ERR_FAIL_COND(tracks[p_idx]->type != TYPE_BLEND_SHAPE);
	bool is_nearest = false;
	if (tracks[p_idx]->interpolation == INTERPOLATION_NEAREST) {