experiments with ai states and steering

[blank.git] / src / model / geometry.hpp

diff --git a/src/model/geometry.hpp b/src/model/geometry.hpp
index f9f87c4f9d14462f31af92b16247e5a6aad584e9..0bc17c162b73afb2e457866ca5c0d98617f59865 100644 (file)
--- a/src/model/geometry.hpp
+++ b/src/model/geometry.hpp
@@ -2,6 +2,7 @@
 #define BLANK_MODEL_GEOMETRY_H_
 
 #include <algorithm>
+#include <limits>
 #include <glm/glm.hpp>
 
 
@@ -13,6 +14,9 @@ constexpr float PI_0p5 = PI * 0.5f;
 constexpr float PI_1p5 = PI * 1.5f;
 constexpr float PI_2p0 = PI * 2.0f;
 
+constexpr float PI_inv = 1.0f / PI;
+constexpr float PI_0p5_inv = 1.0f / PI_0p5;
+
 constexpr float DEG_RAD_FACTOR = PI / 180.0f;
 constexpr float RAD_DEG_FACTOR = 180.0f / PI;
 
@@ -25,6 +29,12 @@ constexpr float rad2deg(float r) {
 }
 
 
+template <class T>
+inline bool iszero(const T &v) {
+       return dot(v, v) < std::numeric_limits<typename T::value_type>::epsilon();
+}
+
+
 template<class T>
 T manhattan_distance(const glm::tvec3<T> &a, const glm::tvec3<T> &b) {
        glm::tvec3<T> diff(abs(a - b));