Simplifying nested ifs with multiple exit points in Scala?

There has to be a better way to do this.. I'm testing for a ray-triangle intersection and my code looks something like this

if(some condition) fail
else {
   ...
   if(some other condition) fail
   else {
      ...
      intersection
   }
}

with many nested ifs. It's disgusting. I'm doing this not to use any return statements. Is there an alternate control structure I could use here to manage the various method exit points?