Research textures and shaders

https://www.planetminecraft.com/blog/textureresource-pack-creation---an-indepth-tutorial/ «Although using renders or shaders for the images to let the pack look better, it is recommended to use also default Minecraft (thus unmodded) screenshots as images as not everyone uses these modifications.»

It seems that you can download shaders and modify the GLSL included: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/mods-discussion/2465939-how-to-make-a-glsl-shader-pack

So probably, at some point someone shows howto load GLSL code in Minecraft shaders, and then it is just a matter of implementing in GLSL the shaders logic you want.

https://gamedevelopment.tutsplus.com/tutorials/a-beginners-guide-to-coding-graphics-shaders--cms-23313

GLSL Tutorial: http://www.lighthouse3d.com/tutorials/glsl-tutorial/

Howto write shaders in Minecraft: https://www.reddit.com/r/Minecraft/comments/7hwaxk/where_can_i_get_started_coding_shaders_in/dquf582/

It seems that using https://optifine.net/home and writing GLSL shaders is the way to go.

There are shaders in MC for the Spectator Mode: https://minecraft.gamepedia.com/Shaders

And inside the minecraft jar you can find:

[1.16.1]$ jar tvf 1.16.1.jar | grep shader
   701 Wed Jun 24 10:31:12 CEST 2020 assets/minecraft/shaders/program/notch.fsh
  1217 Wed Jun 24 10:31:12 CEST 2020 assets/minecraft/shaders/program/spider.json
   640 Wed Jun 24 10:31:12 CEST 2020 assets/minecraft/shaders/program/blit.json
   614 Wed Jun 24 10:31:12 CEST 2020 assets/minecraft/shaders/program/outline.json
...

and you can see it is using GLSL shaders:

[mc]$ cat assets/minecraft/shaders/program/antialias.fsh
#version 110

uniform sampler2D DiffuseSampler;

varying vec2 texCoord;
varying vec2 oneTexel;

void main(){
    vec4 c  = texture2D (DiffuseSampler, texCoord);
    vec4 u1 = texture2D (DiffuseSampler, texCoord + vec2 (              0.0, -oneTexel.y      ));
...
    vec4 color = mix (v5, v6, 0.5);
    gl_FragColor = vec4(color.rgb, 1.0);
}

acs commented 4 years ago

The renderer in MagicaVoxel it is based on ray tracing: interactive path tracing renderer. https://medium.com/@junyingw/future-of-gaming-rasterization-vs-ray-tracing-vs-path-tracing-32b334510f1f

acs commented 4 years ago

Textures

The idea is simple: in order to increase the resolution of the surface in the polys, a 2D texture is mapped over them. The key is to define which (u,v) of the texture use in each coordinate (x, y, z) of the poly. The pixels in a texture are called texels, and to distinct the coordinates with the polys (x, y) are called (u, v) (for example Blender does that). OpenGL uses (s,t). The values for values for a texel coordinate goes from 0 to 1 (they are normalized).

Mapping: m(x,y,z) -> (u,v)
Sampling/Color: c(u,v) -> (r,g,b,a)

m(x,y,z)->c(u,v)->(r,g,b,a)

acs commented 4 years ago

Let's focus in creating a texturepack for Minecraft:

I have a first experience creating a skin for my player, that it is creating a texture for my player.

acs commented 4 years ago

Creating a Resource Pack in Minecraft

https://minecraft.gamepedia.com/Tutorials/Creating_a_resource_pack Resource packs can modify textures, models, animations, music, sounds, user interfaces, and languages.

Ok, creeper edition completed:

creeper