From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 21 May 2013 13:19:56 +0000 (+0300)
Subject: Transform normals correctly
X-Git-Url: http://git.tdb.fi/?p=libs%2Fmath.git;a=commitdiff_plain;h=fe9d42c7cb18bc1db6d278bdc2f8372822d025bf

Transform normals correctly
---

diff --git a/source/geometry/transformedshape.h b/source/geometry/transformedshape.h
index 90c37b0..bf508f9 100644
--- a/source/geometry/transformedshape.h
+++ b/source/geometry/transformedshape.h
@@ -115,7 +115,7 @@ inline unsigned TransformedShape<T, D>::get_intersections(const Ray<T, D> &ray,
 			points[i].position = transformation.transform(points[i].position);
 			/* XXX This is not correct for nonuniform scaling.  Inverse of the
 			transpose of the upper DxD part of the matrix should be used. */
-			points[i].normal = transformation.transform(points[i].normal);
+			points[i].normal = transformation.transform_linear(points[i].normal);
 			points[i].distance = inner_product(points[i].position-ray.get_start(), ray.get_direction());
 		}
 	}