From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 17 Apr 2017 19:27:29 +0000 (+0300)
Subject: Fix composite shape ray intersection logic
X-Git-Url: http://git.tdb.fi/?p=libs%2Fmath.git;a=commitdiff_plain;h=7de28b9c89ca4554f5c12746f481f5b385529479

Fix composite shape ray intersection logic

The test for start_nesting coalescence was written the wrong way, causing
intersection shapes to return spurious hits when the ray started inside
some part of the shape.  Presumably union shapes did not return hits in
some cases when they should.
---

diff --git a/source/geometry/compositeshape.h b/source/geometry/compositeshape.h
index 0f1dd43..e9aeadc 100644
--- a/source/geometry/compositeshape.h
+++ b/source/geometry/compositeshape.h
@@ -181,7 +181,7 @@ inline unsigned CompositeShape<T, D, O>::get_intersections(const Ray<T, D> &ray,
 		n = k;
 
 		if(i!=shapes.begin())
-			start_nesting = (start_nesting>!Ops::shortcircuit(false));
+			start_nesting = (start_nesting>!Ops::shortcircuit(true));
 	}
 
 	if(buffer!=points)