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optimize root expansion

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This commit is contained in:
Elias Stepanik 2025-06-15 14:58:50 +02:00
parent 292d0508a1
commit c0e7dc34df
6 changed files with 89 additions and 59 deletions
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6
client/src/plugins/environment/systems/voxels/chunk.rs
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@ -9,9 +9,9 @@ impl SparseVoxelOctree {
let step = self.get_spacing_at_depth(self.max_depth);
let half = self.size * 0.5;
let centre = Vec3::new(
(key.0 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
(key.1 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
(key.2 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
self.center.x - half + (key.0 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
self.center.y - half + (key.1 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
self.center.z - half + (key.2 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
);
// depth of the octree node that exactly matches one chunk

8
client/src/plugins/environment/systems/voxels/debug.rs
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@ -13,7 +13,7 @@ pub fn visualize_octree_system(
// Draw a translucent cuboid for the root
gizmos.cuboid(
Transform::from_translation(octree_tf.translation).with_scale(Vec3::splat(octree.size)),
Transform::from_translation(octree.center).with_scale(Vec3::splat(octree.size)),
Color::srgba(1.0, 1.0, 0.0, 0.15),
);
@ -22,7 +22,7 @@ pub fn visualize_octree_system(
visualize_recursive_center(
&mut gizmos,
&octree.root,
octree_tf.translation, // center of root in world
octree.center, // center of root in world
octree.size,
0,
octree.max_depth,
@ -103,9 +103,9 @@ pub fn draw_grid(
};
let camera_pos = camera_tf.translation;
for (octree, octree_tf) in octree_query.iter() {
for (octree, _octree_tf) in octree_query.iter() {
let half_size = octree.size * 0.5;
let root_center = octree_tf.translation;
let root_center = octree.center;
// Voxel spacing at max depth
let spacing = octree.get_spacing_at_depth(octree.max_depth);

43
client/src/plugins/environment/systems/voxels/helper.rs
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@ -28,8 +28,8 @@ impl SparseVoxelOctree {
pub fn normalize_to_voxel_at_depth(&self, position: Vec3, depth: u32) -> Vec3 {
// Convert world coordinate to normalized [0,1] space.
let half_size = self.size * 0.5;
// Shift to [0, self.size]
let shifted = (position + Vec3::splat(half_size)) / self.size;
// Shift to [0, self.size] taking the octree centre into account
let shifted = (position - (self.center - Vec3::splat(half_size))) / self.size;
// Determine the number of voxels along an edge at the given depth.
let voxel_count = 2_u32.pow(depth) as f32;
// Get the voxel index (as a float) and then compute the center in normalized space.
@ -40,7 +40,7 @@ impl SparseVoxelOctree {
pub fn denormalize_voxel_center(&self, voxel_center: Vec3) -> Vec3 {
let half_size = self.size * 0.5;
// Convert the normalized voxel center back to world space.
voxel_center * self.size - Vec3::splat(half_size)
voxel_center * self.size - Vec3::splat(half_size) + self.center
}
@ -109,9 +109,9 @@ impl SparseVoxelOctree {
pub fn contains(&self, x: f32, y: f32, z: f32) -> bool {
let half_size = self.size / 2.0;
let eps = 1e-6;
(x >= -half_size - eps && x < half_size + eps)
&& (y >= -half_size - eps && y < half_size + eps)
&& (z >= -half_size - eps && z < half_size + eps)
(x >= self.center.x - half_size - eps && x < self.center.x + half_size + eps)
&& (y >= self.center.y - half_size - eps && y < self.center.y + half_size + eps)
&& (z >= self.center.z - half_size - eps && z < self.center.z + half_size + eps)
}
/// Retrieve a voxel at world coordinates by normalizing and looking up.
@ -122,12 +122,8 @@ impl SparseVoxelOctree {
pub fn local_to_world(&self, local_pos: Vec3) -> Vec3 {
// Half the total octree size, used to shift the center to the origin.
let half_size = self.size * 0.5;
// Convert local coordinate to world space:
// 1. Subtract 0.5 to center the coordinate at zero (range becomes [-0.5, 0.5])
// 2. Multiply by the total size to scale into world units.
// 3. Add half_size to shift from a center–based system to one starting at zero.
(local_pos - Vec3::splat(0.5)) * self.size + Vec3::splat(half_size)
// Convert normalized coordinate to world space, accounting for the octree centre
(local_pos - Vec3::splat(0.5)) * self.size + self.center
}
@ -248,13 +244,12 @@ pub fn face_orientation(dx: f32, dy: f32, dz: f32, voxel_size_f: f32) -> (Vec3,
pub(crate) fn chunk_key_from_world(tree: &SparseVoxelOctree, pos: Vec3) -> ChunkKey {
let half = tree.size * 0.5;
let step = tree.get_spacing_at_depth(tree.max_depth);
let scale = CHUNK_SIZE as f32 * step; // metres per chunk
ChunkKey(
((pos.x + half) / scale).floor() as i32,
((pos.y + half) / scale).floor() as i32,
((pos.z + half) / scale).floor() as i32,
((pos.x - tree.center.x + half) / scale).floor() as i32,
((pos.y - tree.center.y + half) / scale).floor() as i32,
((pos.z - tree.center.z + half) / scale).floor() as i32,
)
}
@ -263,9 +258,9 @@ pub fn world_to_chunk(tree: &SparseVoxelOctree, p: Vec3) -> ChunkKey {
let half = tree.size * 0.5;
let scale = CHUNK_SIZE as f32 * step;
ChunkKey(
((p.x + half) / scale).floor() as i32,
((p.y + half) / scale).floor() as i32,
((p.z + half) / scale).floor() as i32,
((p.x - tree.center.x + half) / scale).floor() as i32,
((p.y - tree.center.y + half) / scale).floor() as i32,
((p.z - tree.center.z + half) / scale).floor() as i32,
)
}
@ -273,9 +268,9 @@ pub fn chunk_center_world(tree: &SparseVoxelOctree, key: ChunkKey) -> Vec3 {
let half = tree.size * 0.5;
let step = tree.get_spacing_at_depth(tree.max_depth);
Vec3::new(
(key.0 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
(key.1 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
(key.2 as f32 + 0.5) * CHUNK_SIZE as f32 * step - half,
tree.center.x - half + (key.0 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
tree.center.y - half + (key.1 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
tree.center.z - half + (key.2 as f32 + 0.5) * CHUNK_SIZE as f32 * step,
)
}
@ -298,8 +293,8 @@ impl SparseVoxelOctree {
pub fn collect_voxels_in_region(&self, min: Vec3, max: Vec3) -> Vec<(Vec3, Voxel)> {
let half_size = self.size * 0.5;
let root_bounds = AABB {
min: Vec3::new(-half_size, -half_size, -half_size),
max: Vec3::new(half_size, half_size, half_size),
min: self.center - Vec3::splat(half_size),
max: self.center + Vec3::splat(half_size),
};
let mut voxels = Vec::new();
self.collect_voxels_in_region_recursive(&self.root, root_bounds, min, max, &mut voxels);

74
client/src/plugins/environment/systems/voxels/octree.rs
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@ -26,6 +26,7 @@ impl SparseVoxelOctree {
root: OctreeNode::new(),
max_depth,
size,
center: Vec3::ZERO,
show_wireframe,
show_world_grid,
dirty: Vec::new(),
@ -125,9 +126,9 @@ impl SparseVoxelOctree {
let step = self.get_spacing_at_depth(self.max_depth);
let half = self.size * 0.5;
let gx = ((position.x + half) / step).floor() as i32;
let gy = ((position.y + half) / step).floor() as i32;
let gz = ((position.z + half) / step).floor() as i32;
let gx = ((position.x - self.center.x + half) / step).floor() as i32;
let gy = ((position.y - self.center.y + half) / step).floor() as i32;
let gz = ((position.z - self.center.z + half) / step).floor() as i32;
let lx = gx - key.0 * CHUNK_SIZE;
let ly = gy - key.1 * CHUNK_SIZE;
@ -272,32 +273,65 @@ impl SparseVoxelOctree {
false
}
fn expand_root(&mut self, _x: f32, _y: f32, _z: f32) {
fn expand_root(&mut self, x: f32, y: f32, z: f32) {
info!("Root expanding ...");
// Save the old root and its size.
let old_root = std::mem::replace(&mut self.root, OctreeNode::new());
let old_size = self.size;
// Update the octree's size and depth.
// Save the old root
let old_root = std::mem::replace(&mut self.root, OctreeNode::new());
let old_center = self.center;
let old_size = self.size;
let half = old_size * 0.5;
// Determine in which direction to expand along each axis
let mut shift = Vec3::ZERO;
if x >= old_center.x {
shift.x = half;
} else {
shift.x = -half;
}
if y >= old_center.y {
shift.y = half;
} else {
shift.y = -half;
}
if z >= old_center.z {
shift.z = half;
} else {
shift.z = -half;
}
// New center after expansion
self.center += shift;
self.size *= 2.0;
self.max_depth += 1;
// Reinsert each voxel from the old tree.
let voxels = Self::collect_voxels_from_node(&old_root, old_size);
for (world_pos, voxel, _depth) in voxels {
self.insert(world_pos, voxel);
// Determine which child the old root should occupy
let mut index = 0usize;
if shift.x < 0.0 {
index |= 1;
}
if shift.y < 0.0 {
index |= 2;
}
if shift.z < 0.0 {
index |= 4;
}
let mut children = Box::new(core::array::from_fn(|_| OctreeNode::new()));
children[index] = old_root;
self.root.children = Some(children);
self.root.is_leaf = false;
}
/// Helper: Collect all voxels from a given octree node recursively.
/// The coordinate system here assumes the node covers [–old_size/2, +old_size/2] in each axis.
fn collect_voxels_from_node(node: &OctreeNode, old_size: f32) -> Vec<(Vec3, Voxel, u32)> {
fn collect_voxels_from_node(node: &OctreeNode, old_size: f32, center: Vec3) -> Vec<(Vec3, Voxel, u32)> {
let mut voxels = Vec::new();
Self::collect_voxels_recursive(
node,
-old_size / 2.0,
-old_size / 2.0,
-old_size / 2.0,
center.x - old_size / 2.0,
center.y - old_size / 2.0,
center.z - old_size / 2.0,
old_size,
0,
&mut voxels,
@ -440,7 +474,7 @@ impl SparseVoxelOctree {
// Convert the normalized neighbor coordinate back to world space
let half_size = self.size * 0.5;
let neighbor_world = neighbor * self.size - Vec3::splat(half_size);
let neighbor_world = neighbor * self.size - Vec3::splat(half_size) + self.center;
if !self.contains(neighbor_world.x, neighbor_world.y, neighbor_world.z) {
return false;
@ -454,8 +488,8 @@ impl SparseVoxelOctree {
// Start from the root node
let half_size = self.size / 2.0;
let root_bounds = AABB {
min: Vec3::new(-half_size as f32, -half_size as f32, -half_size as f32),
max: Vec3::new(half_size as f32, half_size as f32, half_size as f32),
min: self.center - Vec3::splat(half_size),
max: self.center + Vec3::splat(half_size),
};
self.raycast_recursive(&self.root, ray, &root_bounds, 0)
}
@ -537,7 +571,7 @@ impl SparseVoxelOctree {
self.dirty_chunks.clear();
self.occupied_chunks.clear();
let voxels = Self::collect_voxels_from_node(&self.root, self.size);
let voxels = Self::collect_voxels_from_node(&self.root, self.size, self.center);
for (pos, _voxel, _depth) in voxels {
let key = chunk_key_from_world(self, pos);
self.occupied_chunks.insert(key);

6
client/src/plugins/environment/systems/voxels/render_chunks.rs
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@ -55,9 +55,9 @@ pub fn rebuild_dirty_chunks(
let half = tree_ref.size * 0.5;
let step = tree_ref.get_spacing_at_depth(tree_ref.max_depth);
let origin = Vec3::new(
key.0 as f32 * CHUNK_SIZE as f32 * step - half,
key.1 as f32 * CHUNK_SIZE as f32 * step - half,
key.2 as f32 * CHUNK_SIZE as f32 * step - half,
tree_ref.center.x - half + key.0 as f32 * CHUNK_SIZE as f32 * step,
tree_ref.center.y - half + key.1 as f32 * CHUNK_SIZE as f32 * step,
tree_ref.center.z - half + key.2 as f32 * CHUNK_SIZE as f32 * step,
);
let mult = 1 << lod;

1
client/src/plugins/environment/systems/voxels/structure.rs
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@ -38,6 +38,7 @@ pub struct SparseVoxelOctree {
pub root: OctreeNode,
pub max_depth: u32,
pub size: f32,
pub center: Vec3,
pub show_wireframe: bool,
pub show_world_grid: bool,