Rendering Sphere - Help

[TakutoShindo]

Hello guys,

I'm new to modding. I'm trying to make a soccer mod and struggling to create the ball entity. I created it in 1.12, but impossible to port it in 1.19+ because Glu Spheres are not usable anymore.

Do you have any idea how to do it ?
Thanks in advance

[warjort]

It's not something I know a lot about. But here's some pointers so you can research around the topic.

 

When minecraft draws stuff, it does so by sending vertices in a buffer to a shader. Each vertex has data like position, color, facing, texture co-ords in the atlas, etc.

Some terminology:

vertex -> structured data

buffer -> contiguous data passed to the graphics card, e.g. an array of vertices

shader -> program that runs on the graphics card: https://github.com/misode/mcmeta/tree/assets/assets/minecraft/shaders/core

 

Each buffer/vertex also has a "primitive", that says how it should be interpreted. https://www.khronos.org/opengl/wiki/Primitive

There is no sphere primitive in opengl. Instead you build it up from other primitives, e.g. https://stackoverflow.com/questions/7687148/drawing-sphere-in-opengl-without-using-glusphere

 

In minecraft which primitive to use is determined by the RenderType. Which has a VertextFormat.Mode (LINES, QUADS, TRIANGLES, etc.) amongst other things.

Most places in minecraft obviously use LINES or QUADS ("squares"). An example of using triangles can be found in MobRenderer.renderLeash().

 

That's the 10,000 foot view. I am not very good the at the details. 🙂