I took a look at TerraRay recently, and found it a good, low priced 3D scenery generator. It didn't have the features of the big boys like Vue or Bryce, but it is a fraction of the price. One of my biggest complaints in my review was that the rendering was slow.
Now the app has a free update to version 5 for current users, and a 50% off price of US $9.99 until September 26. You can find TerraRay at the Mac app store.
In my tests, rendering speed has increased about 3x over version 4.5. The app has also added a configurable
