organization and buidings db

engine/world_generation/src/generators/chunk_colliders.rs

@@ -0,0 +1,63 @@
+use crate::{hex_utils::*, prelude::*};
+#[cfg(feature = "tracing")]
+use bevy::log::*;
+use bevy::prelude::*;
+
+const CHUNK_TOTAL: usize = Chunk::SIZE * Chunk::SIZE;
+
+pub fn generate_chunk_collider(chunk: &MeshChunkData) -> (Vec<Vec3>, Vec<[u32; 3]>) {
+	#[cfg(feature = "tracing")]
+	let span = info_span!("generate_chunk_collider").entered();
+	let vertex_count: usize = CHUNK_TOTAL * 6;
+	let mut verts = Vec::with_capacity(vertex_count);
+	let mut indices = Vec::with_capacity(vertex_count);
+	for z in 0..Chunk::SIZE {
+		for x in 0..Chunk::SIZE {
+			let height = chunk.heights[x + z * Chunk::SIZE];
+			let coord = HexCoord::from_grid_pos(x, z);
+			let neighbors = chunk.get_neighbors(&coord);
+			let off_pos = Vec3::new(x as f32, height, z as f32);
+			let tile_pos = offset3d_to_world(off_pos);
+			create_tile_collider(tile_pos, &mut verts, &mut indices, &neighbors);
+		}
+	}
+	return (verts, indices);
+}
+
+fn create_tile_collider(pos: Vec3, verts: &mut Vec<Vec3>, indices: &mut Vec<[u32; 3]>, neighbors: &[f32; 6]) {
+	let idx = verts.len() as u32;
+	for i in 0..6 {
+		let p = pos + HEX_CORNERS[i];
+		verts.push(p);
+	}
+
+	//Top Surfave
+	indices.push([idx, idx + 1, idx + 5]);
+	indices.push([idx + 1, idx + 2, idx + 5]);
+	indices.push([idx + 2, idx + 4, idx + 5]);
+	indices.push([idx + 2, idx + 3, idx + 4]);
+
+	for i in 0..neighbors.len() {
+		let n_height = neighbors[i];
+		if n_height < pos.y {
+			create_tile_wall_collider(
+				idx,
+				Vec3::new(pos.x, n_height.min(pos.y - OUTER_RADIUS / 2.), pos.z),
+				i,
+				verts,
+				indices,
+			);
+		}
+	}
+}
+
+fn create_tile_wall_collider(idx: u32, pos: Vec3, dir: usize, verts: &mut Vec<Vec3>, indices: &mut Vec<[u32; 3]>) {
+	let idx2 = verts.len() as u32;
+
+	verts.push(pos + HEX_CORNERS[dir]);
+	verts.push(pos + HEX_CORNERS[(dir + 1) % 6]);
+
+	let off = dir as u32;
+	indices.push([idx + off, idx + ((off + 1) % 6), idx2 + 1]);
+	indices.push([idx + off, idx2 + 1, idx2]);
+}