gaiku-3d 0.1.0

3d agnostic framework (game engine) terrain engine.
Documentation 
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use std::collections::HashMap;

use gaiku_common::{nalgebra::Point3, Baker, Chunk, Mesh};

pub struct VoxelBaker;

// TODO: Optimize, don't create faces between chunks if there's a non empty voxel
impl Baker for VoxelBaker {
    fn bake(chunk: &Chunk) -> Option<Mesh> {
        let mut indices = vec![];
        let mut vertices_cache = HashMap::new();
        let mut colors = vec![];
        let x_limit = chunk.width() - 1;
        let y_limit = chunk.height() - 1;
        let z_limit = chunk.depth() - 1;

        for x in 0..*chunk.width() {
            let fx = x as f32;
            for y in 0..*chunk.height() {
                let fy = y as f32;
                for z in 0..*chunk.depth() {
                    let fz = z as f32;

                    if chunk.is_air(x, y, z) {
                        continue;
                    }

                    let top_left_back =
                        Self::index(&mut vertices_cache, [fx - 0.5, fy + 0.5, fz - 0.5].into());
                    let top_right_back =
                        Self::index(&mut vertices_cache, [fx + 0.5, fy + 0.5, fz - 0.5].into());
                    let top_right_front =
                        Self::index(&mut vertices_cache, [fx + 0.5, fy + 0.5, fz + 0.5].into());
                    let top_left_front =
                        Self::index(&mut vertices_cache, [fx - 0.5, fy + 0.5, fz + 0.5].into());
                    let bottom_left_back =
                        Self::index(&mut vertices_cache, [fx - 0.5, fy - 0.5, fz - 0.5].into());
                    let bottom_right_back =
                        Self::index(&mut vertices_cache, [fx + 0.5, fy - 0.5, fz - 0.5].into());
                    let bottom_right_front =
                        Self::index(&mut vertices_cache, [fx + 0.5, fy - 0.5, fz + 0.5].into());
                    let bottom_left_front =
                        Self::index(&mut vertices_cache, [fx - 0.5, fy - 0.5, fz + 0.5].into());

                    // Top
                    if y == y_limit || chunk.is_air(x, y + 1, z) {
                        indices.push(top_left_back);
                        indices.push(top_right_back);
                        indices.push(top_left_front);

                        indices.push(top_right_back);
                        indices.push(top_right_front);
                        indices.push(top_left_front);

                        colors.push([0.23, 0.42, 0.12, 1.0].into());
                    }

                    // Bottom
                    if y == 0 || (y > 0 && chunk.is_air(x, y - 1, z)) {
                        indices.push(bottom_left_back);
                        indices.push(bottom_right_back);
                        indices.push(bottom_left_front);

                        indices.push(bottom_right_back);
                        indices.push(bottom_right_front);
                        indices.push(bottom_left_front);

                        colors.push([0.24, 0.16, 0.11, 1.0].into());
                    }

                    // Left
                    if x == 0 || (x > 0 && chunk.is_air(x - 1, y, z)) {
                        indices.push(top_left_back);
                        indices.push(top_left_front);
                        indices.push(bottom_left_back);

                        indices.push(top_left_front);
                        indices.push(bottom_left_front);
                        indices.push(bottom_left_back);

                        colors.push([0.33, 0.23, 0.16, 1.0].into());
                    }

                    // Right
                    if x == x_limit || chunk.is_air(x + 1, y, z) {
                        indices.push(top_right_front);
                        indices.push(top_right_back);
                        indices.push(bottom_right_front);

                        indices.push(top_right_back);
                        indices.push(bottom_right_back);
                        indices.push(bottom_right_front);

                        colors.push([0.33, 0.23, 0.16, 1.0].into());
                    }

                    // Front
                    if z == z_limit || chunk.is_air(x, y, z + 1) {
                        indices.push(top_left_front);
                        indices.push(top_right_front);
                        indices.push(bottom_left_front);

                        indices.push(top_right_front);
                        indices.push(bottom_right_front);
                        indices.push(bottom_left_front);

                        colors.push([0.41, 0.29, 0.20, 1.0].into());
                    }

                    // Back
                    if z == 0 || chunk.is_air(x, y, z - 1) {
                        indices.push(top_right_back);
                        indices.push(top_left_back);
                        indices.push(bottom_right_back);

                        indices.push(top_left_back);
                        indices.push(bottom_left_back);
                        indices.push(bottom_right_back);

                        colors.push([0.41, 0.29, 0.20, 1.0].into());
                    }
                }
            }
        }

        let mut vertices: Vec<Point3<f32>> = vec![Point3::new(0.0, 0.0, 0.0); vertices_cache.len()];
        for (_, (vertex, index)) in vertices_cache {
            vertices[index] = vertex.clone();
        }

        if indices.len() > 0 {
            Some(Mesh {
                indices,
                vertices,
                normals: vec![],
                colors,
                uv: vec![],
                tangents: vec![],
            })
        } else {
            None
        }
    }
}