The most common causes of Out of Memory errors are not having enough RAM, unneeded complexity in your model, and unnecessarily high render settings. There are several things you can do to avoid getting Out of Memory errors. These steps reduce the model's memory requirements:

1. Simplify your model by converting Subdivision meshes, Boolean objects, Deformation lattices, etc. to simple polygon meshes.

2. Make sure you have made use of Shapes for repeating objects in your model.

3. Make sure the image maps in your textures are not higher resolution than you need.

4. Make sure to use appropriate render settings. You can check the Art and Science of Strata 3D and the User Guide for more information about render settings. In addition, the StrataCafe forums are a good source of information.

5. Do not copy and paste large images or models; this ties up memory in the clipboard. You can clear the clipboard's memory by copying a simple cube or sphere.

Another reason you may get an Out of Memory error is that your rendering requires more memory then your computer has. Memory allocation is handled automatically by the program. It will request as much as it needs from the OS until there is no more to be given, and you get the error message.

If you're not sure if your computer has enough memory to accomplish what you need, you may want to check the Benchmarks page on the StrataCafe: http://www.stratacafe.com/benchmarks.asp

NOTE: Design 3D is a 32-bit program which limits the amount of RAM it can address to 4GB regardless of how much there may be in the computer. Subtracting system overhead gives a useable amount in the neighborhood of 3.5GB that the program can actually make use of.