I must have spends hundreds of hours on enhancing the performance of ScrewBox, but today I learned that I have missed some pretty obvious basics.

For context: I am working on a MacOs machine and when I started graphic programming with Java I learned that there was a pretty unavoidable system property that must be set to avoid software rendering and therefore low fps values: sun.java2d.opengl=true. When I discovered the option this massively enhanced the speed of apps created with ScrewBox.

When JDK 21 added support for the Metal API on MacOs I was quite disappointed that this didn't enhance the performance at all. But I simply missed removing the outdated property.

ScrewBox warns you, when you are not using the opengl setting and my local run configurations already packed these settings so I didn't question this after so many hours getting used to enforce this setting.

Today I discovered that removing the setting allows the JDK on MacOs to default to the Metal API and therefore push the performance from 800 to 1000 fps in one app and from 8000 to 11000 fps in another simpler one.

Version 3.8.0 removed the unnecessary warning on MacOs and automatically defaults to OpenGl on Windows machines. There is no longer a need to specify any JVM start parameters when working on Windows.

Greetings! Version 3.4.0 of ScrewBox added support for generating Perlin Noise and fractal noise. Both algorithms can be used to generate infinite deterministic landscapes and are commonly used in games like Minecraft or whenever 'procedural generation' is mentioned. The next minor version of ScrewBox will also add support for three dimensional Perlin Noise.

ScrewBox is a game engine designed for creating 2D content, so the third dimension used for generating noise will most likely be time. Nonetheless, you can also create some pseudo 3D content using these utilities, as seen in the example screenshots. The second one is a three-dimensional fractal noise which looks quite cool but doesn't add much value to the engine because it's so slow and I cannot imagine any actual use but creating nice looking blog post illustrations.

Generating noise is quite easy. Enjoy!

// 2D noise
PerlinNoise.generatePerlinNoise(seed, x, y); // value in range -1 to 1

// 3D noise
PerlinNoise.generatePerlinNoise3d(seed, x, y, z); // value in range -1 to 1

Update July 26, 2025​

After massively improving the performance of noise generation (10 times faster!) version 3.6.0 will also ship 3d Fractal Noise generation. Because, why not?

Yesterday I reworked the build process to move Maven source to the updated Sonartype Central Repository. I used the opportunity to update the Maven coordinates to the new domain. ScrewBox can now be found at the updated coordinates: dev.screwbox:screwbox-core. The update comes with updated packages for all classes and some improvements for the build process. For further info see full changelog.

Greetings! Version 2.19.0 of the ScrewBox engine has just been released. This version adds support for simple fluid physics.

To make something fluid, just add a FluidComponent to the entity you want it to be. To make the fluid show up, add a FluidRenderComponent and pick your colors to make water, lava, or anything else you want. Physics entities can swim in the fluid by adding a FloatComponent.

Future will tell what features will be added to the fluid physics. In the current state, the fluids are quite rudimentary. Combining the fluids with a reflection is definitely on my to-do list.

A few weeks ago I decided to add some real documentation to ScrewBox, the project I have worked on for nearly four years now. I used this opportunity to register screwbox.dev as new home address for the project. Hopefully anybody will have a few good hours or days working with ScrewBox. Stay tuned for some upcoming content updates.