size of spheres displayed on paraview wrong

Hello,

I am a researcher in material science and I have a problem with the display of my output graphics ( a sphere packing) in paraview:
The radii of the spheres in paraview are not represented at the size they should be: there are only points instead of visible colored spheres at the output.
Here is a copy of a *.vtu file of the packing below (packingspheres.0.vtu generated from yade).

Thank you very much for your help,

Best wishes

Fr.

<?xml version="1.0"?> 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l6Naz6NToFnKrU7Aj6ayY2GPHxWfITxnmPDIqASXDZWnf709RJZNA/WgJU5zyZ4FXufjHLAUFujr8ogzmKN223Wo5Xli46iAGsTxY9sS2Zq024w0+wL9ckeG7xyPu7E70Np5C85etSF/qwlw/f3rdjOWKr/aM05hEmx2ZqLR240mzA+JG8TlUR4ZhTchQcVPNjE1mUhy4aB8uuw7Hy8BiVB/wZp/cPbiXqkWsNEZKoRPH/5IR09ocqdMzH7Kav8Vj5yFU+aTMdVskbGMvz8QqBVrX6nN3rQW/Wn2A/fGpXNReitjCXbj6S4PTkgZw+ogpzExexraybYgpzReGFwI45puCuNY8hZdDfiIqXJ6jm8O54W00G7KuiK7jMXT5FchrZlq8/fUTFp5dKdL35IiLE8151NURSn3tGXvAkLK3Bc901gjHNTP54rsKX/25HVtjrDlwIXhRxUZkuGeIJxvLsPOqHBNmXxLfbmbhW0g8d+ZqsPSkFJMqq8WkJyYcqD6Ax9NWI1N3MlSkzbj1pCnFvTphh09Q3DCbd+HORdoCR64bsLBiNHRnWjE1WZnTKs/h4AczfNPQ5OLHyzFcxo1/5Wnj1LlfiOmwQrrVJPTftx7z9taJXw/7s73BBum6ylh+2RDrF0oh8bgnDc6HQs9rDAOHmVJqeAN8Opx5wSFLDBuqgZb2pWzOTEO24XDme90Vc9VnsKEzihDLeGSVM2RN2iBf8QVrBt8VP2qycPqPXXB4oMcLf5Qg7OlcJlXEUuvVGSxxi+Ytt/OwnjqH61fW2frudmSrWIvrJvJ0TJ/P3hsHw3vYSDaqdtlqKPpzwXtXlvcLp7HLRMYdvI+hyzTp5TKV6vnKnCklz93BnzDz0jZxtW8fLvWLZGj+Yt5aLM0ppUfg7RLAY1U2TMj1wKbcUaxMXAkPWTmRtXINXHK1uFcriNbCFR0H7iAjaZ3ospvFQQMixYIxy5iv5IqLlQ22OlJGDB55EoddbVj++zoGzi/B6ok6HCOsUPW+F0zVDWmt4YlNnkn0UylG545KWM2zYx/78QzSs6OpXxJzquZwzehZtI0JYOuhF6j/IccnOUk8Vn1IqP4OED3ZS+n6Kp4WBW14nPzQNvvJE2SH/xC3rjwVNzMOY8FrVV7YHcgQ1d58mJMpLqQHoF1Lhi/1ZNFbeiI3Ffkz/2OmyG/tQtHXIRixIJzra/bgcc89YaQXQEdNda4O68M3RYt5U/SladwMHg11Ytiw/bBIb7Z18leX6Mpe+P2QaE01BV/7+7ElOJQ2lbL8de4xvi5w5MD4m/jqIDh9sz7adwayyqEXp0fHMdXwL0zzVOLGCVIc7bYV4TnrMG2SCj2masNfZzKzZII5a0QU5DR2oqLiHe5IPPp4aW+a3Ipi+4VYdt5RgtFnG3j+WsCmtiJbnUcqVLHyRLihEpIDlXjAuQCLckyYtvwdwo1m0HVjJLf4W9JOku2W42OYd7A/G8smsPJUNgbmQXiIWfyzTVuo7bPjcF97XDNej2Mha7BXwjFte97ifbsHNvu74GhyIoeuN+CLTDlonfKGUZhEc5LMmmifyH2HXJl/35A++yW90DqY31/L0Ci5GKlLniH032Z8mKHIFf66zNRxo7O8hEU+Lkb99CDhYvQMC9OShWL9auCHLxJvXxe0c+LeziCWNt6xbbBJ4h9Z4zn5ixYdCt/Cb99sXjucxDN5WlQx+Sxu7q3DjylqzO+lil0nk2GZ/At1/S5i+cjHULkxmO4Onkyo7Mfiqe3Ql3jVupQTyBjSLaaVRzEv5Jfw7SzFusdn4WI0mXKpbux5ZsKu894sM1NihliD8QaBjEufywG+VuKvdns2hvXi2qJoJjTlYo9PL47QEXg/qBF7IhtsjX5kQGi48NP+M7j7U4rjat7CYpMiYzZb42a3j6TbdYqnxXLsk3ofOyqlMcktBxUnHLhFLKCHnCM9MtyFTXYcK4smIXL6ck6+XoDGUmnINdSJ458vwqlnEjZL5l73eTFHRMhz5fWrCJpgwYCt+6GQcA9Z5wcwr9wCP9sboV42jk9mZCG34aTgdhfuzZCm4SN5ER4Zx6BP9Sh66ML61e0YP7sF1adtGaOxBkkpUuJZTz96xduz85Ual32fwt0HbflN7MKyssHc1iuQdWZZ4kL9aFZ1GDBiWwRS63148+c8pOiNpE75FlRm78PBbvKeSSOW3dgCg96SXj4njnF/yuF3shlrn/7Ay3Zn0ZwzlMNeC9Zke8E1NITeb924qGWTeJHjQZ+a+dziMwLO+uqUqg4Sz/XI6e7ufKAwlecLl7OPkwxVS08hc4AHF1vWYkVvwaUjR/LUXgfeH1uO5F2BLJsfxtWLgqgY2ovDY5yZeVmGVUlLOaTAAy7vQiUIqcyxd9WpeCaOMnWPkFh7FG66vSW7DKNUZX/Ku3RhVM80if+ux+6ikSj9IYdBxa/hvieJ3893iMtvAzmnPY7dzk9to7T3iZUh4+g00A4u80dzvqsiHgwdyLoHWgwIL8Aa3WtYPkGLd81LRGpROJ/IW2BomMTDVxmJAfEv0RK0iAUXXPl/+li9DA==AQAAAACAAACADAAAkgIAAA==eJw11WODEAYAgOF8l23b7rJ1GdddtnHZtnHVvNpqy21hy7Ztt4Whtmz3oaf3y/MT3kiRPhWZURiV0RidMRjAQMZkLMZmHMZlPMZnAiZkIiZmEiZlMiZnCqZkKqZmGqZlOqZnBmZkJmZmFmZlNmZnDuZkLuZmHuZlPuZnARZkIRZmEQaxKIuxOEuwJEuxNMuwLMuxPCuwIiuxMquwKoNZjdVZgzVZi7VZh3VZj/UZwgYMZRgbshEbswmbshmbswVbshVbsw3bsh3bswM7shM7swu7shvD2Z092JO92Jt92Jf92J8DOJCDOJhDOJTDOJwjOJKjOJpjOJbjOJ4TOJGTOJlTOJXTOJ0zGMGZnMXZ/IJf8it+zW/4Lb/j95zDufyBP3Ie5/Mn/swFXMhFXMwlXMplXM5f+CtXcCVXcTV/4+9cw7Vcx/XcwI3cxM3cwq3cxu3cwZ3cxd3cw73cx/08wIM8xMM8wqM8xuM8wZM8xdM8w7M8x/O8wIu8xMu8wqu8xuv8g3/yBm/yFm/zL/7Nf/gv7/Au/+P/vMf7fMCHfMTHfMKnfMbnfMGXfMXXfMO3fMf3/MDP44/MKIzKaIzOGAxgIGMyFmMzDuMyHuMzARMyERMzCZMyGZMzBVMyFVMzDdMyHdMzAzMyEzMzC7MyG7MzB3MyF3MzD/MyH/OzAAuyEAuzCINYlMVYnCVYkqVYmmVYluVYnhVYkZVYmVVYlcGsxuqswZqsxdqsw7qsx/oMYQOGMowN2YiN2YRN2YzN2YIt2Yqt2YZt2Y7t2YEd2Ymd2YVd2Y3h7M4e7Mle7M0+7Mt+7M8BHMhBHMwhHMphHM4RHMlRHM0xHMtxHM8JnMhJnMwpnMppnM4ZjOBHXq+oSQ==AQAAAACAAACADAAAkQIAAA==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eJxjZBwFgwkAADrnAZE=

Sorry for the long file !
here is the beginning of the .vtu file below…

thanks for your help,

Fr.

<?xml version="1.0"?>

see:
https://yade-dem.org/doc/user.html#rendering-spherical-particles-glyphs