In order for you to play Ogre on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Yosemite
Processor (CPU):
2.0 GHz Dual Core Processor
Memory (RAM):
4 GB RAM
Graphics Card:
Intel HD Graphics 4000 or better
Storage:
1 GB available space
In order to play Ogre on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Sierra
Processor (CPU):
3.0 GHz Quad Core Processor
Memory (RAM):
8 GB RAM
Graphics Card:
NVIDIA GeForce GT 650M (1GB GDDR5) / Intel Iris graphics or better
Storage:
1 GB available space