puts "========="
puts " OCC498 "
puts "========="
puts ""
######################################
## Wrong 3d point from offset surface by parameters 
######################################

restore [locate_data_file OCC498.draw] su 

set u1 4.71238898038469
set u2 7.85398163397449
 
svalue su 0 $u1 x1 y1 z1
vertex v1 x1 y1 z1

svalue su 0 $u2 x2 y2 z2
vertex v2 x2 y2 z2

set newU1 [expr $u1 - 1e-11]
set newU2 [expr $u2 + 1e-11]

svalue su 0 $newU1 x1 y1 z1
vertex vv1 x1 y1 z1

svalue su 0 $newU2 x2 y2 z2
vertex vv2 x2 y2 z2

distmini d v1 vv1
regexp {([-0-9.+eE]+)} [dump d_val] full err1

distmini d v2 vv2
regexp {([-0-9.+eE]+)} [dump d_val] full err2

if { $err1 > 1.e-7 || $err2 > 1.e-7} {
    puts "Faulty OCC498: Wrong 3d point from offset surface by parameters "
} else {
    puts "OCC498 OK: Correct 3d point from offset surface by parameters"
}