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-rw-r--r--src/ray.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ray.cpp b/src/ray.cpp
index 2d479b7..ebf392b 100644
--- a/src/ray.cpp
+++ b/src/ray.cpp
@@ -3,6 +3,6 @@
ray::ray(const point3& origin, const vec3& direction): origin(origin), direction(direction)
{}
-point3 ray::at(double t) {
+point3 ray::at(double t) const {
return origin + direction * t;
}