faster ray/box test for AABBs

[blank.git] / src / world / Chunk.hpp

diff --git a/src/world/Chunk.hpp b/src/world/Chunk.hpp
index 7eceb980cb62d6c66918ae9b3eb7fa587416c2c3..045f58df7d6ac29f1140fea27849cc212aea5e30 100644 (file)
--- a/src/world/Chunk.hpp
+++ b/src/world/Chunk.hpp
@@ -35,6 +35,14 @@ public:
        static glm::vec3 Center() noexcept { return glm::vec3(8.0f); }
        static float Radius() noexcept { return 27.71281292110203669632f; /* 16 * √3 */ }
 
+       /// get bounding box relative to given reference chunk
+       AABB RelativeBounds(const ExactLocation::Coarse &ref) const noexcept {
+               AABB bounds;
+               bounds.min = (position - ref) * ExactLocation::Extent();
+               bounds.max = bounds.min + ExactLocation::FExtent();
+               return bounds;
+       }
+
        static constexpr bool InBounds(const ExactLocation::Fine &pos) noexcept {
                return
                        pos.x >= 0.0f && pos.x < fside &&
@@ -141,7 +149,7 @@ public:
                const ExactLocation::Coarse &reference,
                float &dist
        ) const noexcept {
-               return blank::Intersection(ray, Bounds(), Transform(reference), &dist);
+               return blank::Intersection(ray, RelativeBounds(reference), dist);
        }
 
        /// check if given ray intersects any block of this chunk