X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fgeometry%2Fprimitive.hpp;h=cdeae86e5c68b21303b7c27c775d9ff657df8924;hb=f5de855fbd4bf5b0df1cad950cbe9069e41369ca;hp=351a3a432e1c17d3662b9544012e5c997c22328c;hpb=4fbf5a3c1b0e530706023f5fc4be2f68d30ea645;p=blank.git

diff --git a/src/geometry/primitive.hpp b/src/geometry/primitive.hpp
index 351a3a4..cdeae86 100644
--- a/src/geometry/primitive.hpp
+++ b/src/geometry/primitive.hpp
@@ -20,6 +20,12 @@ struct AABB {
 	glm::vec3 Center() const noexcept {
 		return min + (max - min) * 0.5f;
 	}
+
+	/// return distance between origin and farthest vertex
+	float OriginRadius() const noexcept {
+		glm::vec3 high(glm::max(abs(min), abs(max)));
+		return length(high);
+	}
 };
 
 struct Ray {
@@ -34,6 +40,8 @@ bool Intersection(
 	float *dist = nullptr,
 	glm::vec3 *normal = nullptr) noexcept;
 
+/// matrices may translate and rotate, but must not scale/shear/etc
+/// (basically the first three columns must have unit length)
 bool Intersection(
 	const AABB &a_box,
 	const glm::mat4 &a_m,