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fix(brush): reject NaN/non-positive brush settings before sculpt apply

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Same NaN-comparison short-circuit bug as the texture painter — a
brush with a NaN cursor position would mark every vertex in every
'affected' chunk as full influence and silently rewrite huge
swaths of terrain. Reject upfront in applyBrush.
This commit is contained in:
Kelsi 2026-05-06 07:37:54 -07:00
parent 9207d54f20
commit bd6e5fe3de
1 changed files with 10 additions and 1 deletions
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11
tools/editor/terrain_editor.cpp
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@ -289,8 +289,17 @@ void TerrainEditor::commitGeneratorUndo() {
void TerrainEditor::applyBrush(float deltaTime) {
if (!terrain_ || !brush_.isActive()) return;
// Reject NaN brush position / non-positive radius / NaN strength.
// dist = length(pos - center) goes NaN if center has NaN, and
// brush_.getInfluence(NaN) returns full strength on every vertex
// because NaN comparisons always return false.
const auto& bs = brush_.settings();
auto bp = brush_.getPosition();
if (!std::isfinite(bp.x) || !std::isfinite(bp.y) || !std::isfinite(bp.z) ||
!std::isfinite(bs.radius) || bs.radius <= 0.0f ||
!std::isfinite(bs.strength)) return;
switch (brush_.settings().mode) {
switch (bs.mode) {
case BrushMode::Raise: applyRaise(deltaTime); break;
case BrushMode::Lower: applyRaise(deltaTime); break;
case BrushMode::Smooth: applySmooth(deltaTime); break;