{"id":408,"date":"2022-05-22T19:22:00","date_gmt":"2022-05-22T18:22:00","guid":{"rendered":"https:\/\/starshipsimulator.co.uk\/?p=408"},"modified":"2022-08-17T19:27:10","modified_gmt":"2022-08-17T18:27:10","slug":"back-to-galaxy-oop-there-goes-rapidity","status":"publish","type":"post","link":"https:\/\/starshipsimulator.co.uk\/?p=408","title":{"rendered":"Back To Galaxy, Oop There Goes Rapidity"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.9.1″ _module_preset=”default” background_color=”RGBA(0,0,0,0)” custom_margin=”0px|0px|0px|0px|true|true” custom_padding=”0px|0px|0px|0px|true|true” border_color_all=”#000000″][et_pb_row _builder_version=”4.9.1″ _module_preset=”default” background_color=”RGBA(0,0,0,0)” width=”100%” custom_margin=”0px|0px|0px|0px|true|true” custom_padding=”0px|0px|0px|0px|true|true” border_color_all=”#FFFFFF”][et_pb_column type=”4_4″ _builder_version=”4.9.1″ _module_preset=”default”][et_pb_text _builder_version=”4.9.1″ _module_preset=”default” text_font=”||||||||” text_text_color=”#FFFFFF” text_font_size=”16px” text_letter_spacing=”1px” hover_enabled=”0″ sticky_enabled=”0″]Having gotten the new player character working reasonably well on the UE5 build, I’ve gone back to getting the new 1:1 scale Galaxy System working smoothly as well. The first step in the process was generating the complete starfield around the ship using the new scale, but with a greater number of sectors than before so that we can use the same data to render a real-time, dynamic skybox (ie, the stars move outside while at warp).<\/p>\n

Instead of the 8 sectors, we were generating before (a 2×2 cube), we now need to generate a whopping 27 (3×3 cube) to form a full sphere with a radius of 150ly. Given an average of 4000 stars per sector, that’s over 100,000 star systems to manage. Efficiency is the name of the game here, so I’ve been carefully juggling just how much data to generate at set points in the process so as not to overload everything. For example, do I convert each star’s Kelvin temperature to RGB colour at the time of generation, or do I perform that task after the data has been filtered? The jury is still out on that one, but that’s an example of how carefully this needs to be managed.<\/p>\n

Generating a full 3×3 cube of sectors means I only have to regenerate that data afresh when the ship moves into a whole new sector, and given that each sector is 100ly wide, it’s not something that will be happening very often at all. As such, I can generate the data fairly slowly over a period of say 20 seconds so as not to cause any performance impact. All the real-time systems then simply reference the stored data and filter it as needed.<\/p>\n

In case you were wondering (because surely you were), this is what 300x300x300 lightyears looks like when trimmed to a sphere:<\/p>\n

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The next step was harder though because the galaxy is now represented at a literal cm scale and we need to translate the location of the ship within a given cubic lightyear from centimetres to more reasonable galactic coordinates. As you can see here, the local coordinates are massive:<\/p>\n

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With the power of math however I was eventually able to get my head around it, and I’m happy to say we now have a fully working system for traversing the entire 1:1 scale galaxy per centimetre. Don’t just take my word for it though, here’s a video of the ship moving at a very real 200,000,000 times the speed of light:<\/p>\n