When comparing Impact vs Tombstone Engine, the Slant community recommends Impact for most people. In the question“What are the best 3D game engines?” Impact is ranked 30th while Tombstone Engine is ranked 33rd. The most important reason people chose Impact is:
Impact provides 2 types of [collision detection](http://impactjs.com/documentation/collision); static and dynamic collisions. Both of which are easily integrated into game development.
Ranked in these QuestionsQuestion Ranking
Pro Excellent collision detection system
Impact provides 2 types of collision detection; static and dynamic collisions. Both of which are easily integrated into game development.
Many plugins are available, including one called Impact++ which adds features like pathfinding and dynamic lighting.
Pro Level editor
Built-in map editor with support for tiling, collision layers, and actors.
Pro Extensive documentation available to support development
ImpactJS has an active user community that busily produces tremendous resources including videos, books, tutorials, walkthroughs and more. There are also comprehensive class documentation available.
Pro Truly cross-platform allowing developers to build for anything
Extending the reach of a game developed with ImpactJS is easy due to the cross-platform nature the framework. There are Considerations around performance, resolution and audio, however all can be appropriately addressed when in development. Works in the browser via Canvas, even on mobile. Easily translatable into a packaged app.
Pro Complete access to high quality C++ source code
Tombstone gives full access to the clean and professional C++ source code allowing editing and upgrading anything in the system.
Pro Reliable, fast and well optimized
Pro No royalties
Pro Lots of learning resources
Including extensive documentation both in code as well as online along with a wiki, tutorials and a demo game.
Pro Extending engine's functionality is straightforward
Due to the well-organized, highly modular design of the engine adding custom functionality is easy.
Pro Full-featured and modern
Comes integrated with support for physics, audio, networking, input devices, resource management as well as modern features such as real-time shadows, horizontal mapping, voxel-based terrain, dynamic lighting, post-processing effects and much, much more.
Pro Lifetime engine updates
Pro Supportive community
Tombstone has a small, tight-knit community that's well educated and professional. Eric Lengyel, the main developer, can often be found giving thorough advice to users on the forums.
Pro Proven to be a capable engine
Con Not being maintained
Impact is not being maintained anymore. Last release is from 2014.