[sample_consensus] Circle3D: Changed segmentation collinear check precision from float to double.

[ralphieraccoon]

Fixes #6172.

[mvieth]

@ralphieraccoon Thanks for the pull request! However, I would prefer to only change this for the circle3D model at the moment, because only that model uses double precision to compute the model coefficients, while the other four models use single precision (float). So it makes sense that the other models use Eigen::NumTraits<float>::dummy_precision (), not Eigen::NumTraits<double>::dummy_precision ().

[ralphieraccoon]

OK, I think it might be a good idea to get double precision at least for ellipse3D as well, but that can be done in another PR.

[mvieth]

Thanks again!

OK, I think it might be a good idea to get double precision at least for ellipse3D as well, but that can be done in another PR.

Do you mean converting the whole computeModelCoefficients of elliipse3D to double precision? Yes, I see how that could be useful for very small point clouds.