!




mat1 = c
mat2 = d
tsz = e
tm = f
am = g


material mat1

prism_   4, 0.015, 

    0, 0.005, 15,
    -a/2+tsz-0.01, 0.005, 15,
    -a/2+tsz-0.01, am-tsz+0.01, 15,
    0, am-tsz+0.01, 15



