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You can try this:

float pts[rows*dim] = {
    0.270598,0.254439,0.471311,
    0.270598,0.254439,0.518814,
    0.270598,0.282268,0.518814,
    0.270598,0.282268,0.471311,
    0.396951,0.254439,0.471311,
    0.396951,0.282268,0.471311,
    0.396951,0.282268,0.518814,
    0.396951,0.254439,0.518814
};

Mat points(rows, 1, CV_32FC3, pts);

Also, may be this would be useful: Working with pixels.