Issue with new mac compilers result in precision differences with very small numbers This causes failures in the test comparisons between mac runs and reference FIX TEST: change test to avoid square, make vertical length shorter than horiz. FIX TEST: or set user value for epsilon zero volume For "degenerate" cases with 4 vertices on circumscribed circle, you can put the diagonal edge of the rectangle on either diagonal and round off may be the deciding factor. Different connection of degenerate case is still correct/Delaunay. NOTE files written without zero coefs are the same: output_mac/out_hex_3x4.uge output_linux/out_hex_3x4.uge Files with all coefs including zero coefs differ: diff output_mac/out_hex_3x4.stor output_linux/out_hex_3x4.stor 2,3c2,3 < Thu Dec 21 11:21:38 20233-D Linear Diffusion Model (matbld3d_astor) < 7 24 143 1 6 --- > Tue Jan 2 09:50:13 20243-D Linear Diffusion Model (matbld3d_astor) > 8 24 145 1 7 13c13 < 124 129 133 139 143 --- > 124 130 134 141 145 34,37c34,37 < 18 20 21 24 10 < 19 22 23 11 12 < 20 22 23 24 12 < 21 23 24 --- > 18 20 21 23 24 > 10 19 22 23 11 > 12 20 21 22 23 > 24 12 21 23 24 49c49 < 4 7 7 6 6 --- > 4 7 8 6 6 58,61c58,62 < 2 3 7 2 6 < 2 7 4 5 7 < 1 4 7 4 6 < 2 4 7 0 0 --- > 2 3 7 7 2 > 6 2 7 4 5 > 8 1 7 4 7 > 4 6 2 4 7 > 0 0 0 0 0 66d66 < 0 0 0 71c71 < 128 132 138 143 --- > 128 133 140 145 73c73 < -4.166666666667E-02 -1.515940605973E-17 --- > -4.166666666667E-02 -4.618806972100E-17 -1.671098990551E-17