--- layout: doc title: "Demo: Lots of Cubes" description: 'fennecs demo walkthrough: simulate masses of cube entities on the CPU and bulk-transfer their transforms into the Godot and Stride renderers.' --- ## Demo: Lots of Cubes This demo demonstrates a simple case how to update the state of a large number of Entities, and how to bring this data into a Game Engine. ### Source Code This demo is available for the following: | MonoGame |[Godot](https://github.com/outfox/fennecs/tree/main/demos/godot) | Flax | Unigine | [Stride](https://github.com/outfox/fennecs/tree/main/demos/stride) | Raylib | NeoAxis | |:--------------:|:------------------:|:--------------:|:--------------:|:--------------:|:--------------:|:--------------:| |![MonoGame](/img/logo-monogame-80.png){.tile64 .nope} | ![Godot](/img/logo-godot-80.png){.tile64} | ![Flax Engine](/img/logo-flax-80.png){.tile64 .nope} | ![UNIGINE](/img/logo-unigine-80-darkmode.png){.dark-only .tile64 .nope} ![UNIGINE](/img/logo-unigine-80-lightmode.png){.light-only .tile64 .nope} | ![Stride](/img/logo-stride-80.png){.tile64} | ![Raylib-cs](/img/logo-raylib-80.png){.tile64 .nope} | ![NeoAxis Engine](/img/logo-neoaxis-80-darkmode.png){.dark-only .tile64 .nope} ![NeoAxis Engine](/img/logo-neoaxis-80-lightmode.png){.light-only .tile64 .nope} | ### Video (Godot Version) ::: info All motion is 100% CPU simulation (no GPU). The point is not that this _could be done faster_ on the GPU, the point is that it _can be done fast_ on the CPU. 🦊 ::: State is stored in Components on the Entities: - 1x `Vector3` (as Position) - 1x `Matrix` (as Transform) - 1x `int` (as a simple identifier) The state is transferred into the Game Engine in bulk each frame using Stream.Raw in order to submit just the `Matrix` structs directly to the Engine's data structures for this task. This static data is then used by the Engine's Renderer and to display the Entities. ### Video (Stride Version)