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Fix stack overflow during BVH construction

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The epsilon for float equality was too small which prevented the
function from terminating. Additionally, it has been rewritten in terms
of a loop because tail-call optimization was not happening.
This commit is contained in:
Ryan 2022-07-17 22:07:51 -07:00
parent b604dafe73
commit 044a735729
1 changed files with 79 additions and 79 deletions
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38
src/bvh.rs
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@ -6,7 +6,7 @@
use std::iter::FusedIterator;
use std::mem;
use approx::relative_eq;
use approx::abs_diff_eq;
use rayon::iter::{
IndexedParallelIterator, IntoParallelRefIterator, IntoParallelRefMutIterator, ParallelIterator,
};
@ -180,7 +180,7 @@ impl<'a, T> Internal<'a, T> {
fn build_rec<T: Send>(
idx: NodeIdx,
bounds: Aabb<f64>,
mut bounds: Aabb<f64>,
internal_nodes: &mut [InternalNode],
leaf_nodes: &mut [LeafNode<T>],
total_leaf_count: NodeIdx,
@ -192,6 +192,7 @@ fn build_rec<T: Send>(
return (total_leaf_count - 1 + idx, leaf_nodes[0].bb);
}
loop {
debug_assert!(bounds.is_valid());
let dims = bounds.max - bounds.min;
@ -221,28 +222,26 @@ fn build_rec<T: Send>(
// Check if one of the halves is empty. (We can't have empty nodes)
// Also take care to handle the edge case of overlapping points.
if split == 0 {
if relative_eq!(bounds_right.min, bounds_right.max) {
if abs_diff_eq!(
bounds_right.min,
bounds_right.max,
epsilon = f64::EPSILON * 100.0
) {
split += 1;
} else {
return build_rec(
idx,
bounds_right,
internal_nodes,
leaf_nodes,
total_leaf_count,
);
bounds = bounds_right;
continue;
}
} else if split == leaf_nodes.len() {
if relative_eq!(bounds_left.min, bounds_left.max) {
if abs_diff_eq!(
bounds_left.min,
bounds_left.max,
epsilon = f64::EPSILON * 100.0
) {
split -= 1;
} else {
return build_rec(
idx,
bounds_left,
internal_nodes,
leaf_nodes,
total_leaf_count,
);
bounds = bounds_left;
continue;
}
}
@ -276,7 +275,8 @@ fn build_rec<T: Send>(
internal.left = left;
internal.right = right;
(idx + split as NodeIdx - 1, internal.bb)
break (idx + split as NodeIdx - 1, internal.bb);
}
}
fn partition<T>(s: &mut [T], mut pred: impl FnMut(&T) -> bool) -> usize {