Make object::hit provides hit time t.

Visualize normal vector at hit point.
Add pixel<T>::from_normalized(const vec3d&) for visualizing normal vector.

1 files changed, 6 insertions, 1 deletions

diff --git a/bitmap.h b/bitmap.h
index 31b9053..09f3711 100644
--- a/bitmap.h
+++ b/bitmap.h
@@ -31,10 +31,15 @@ struct pixel {
      * Create a pixel with given depth, from normalized color values.
      * For example: for 8bit pixel, with (1, 0.5, 0.25), we get: (255, 127, 63).
      */
-    static pixel<T> from_normalized(double r, double g, double b) {
+    static inline pixel<T> from_normalized(double r, double g, double b) {
         const auto mod = (1ULL << (sizeof(T) * 8U)) - 1ULL;
         return pixel<T>{.r = (T) (mod * r), .g = (T) (mod * g), .b = (T) (mod * b)};
     }
+
+    // v3d must be a normalized vector
+    static inline pixel<T> from_normalized(const vec3d &v3d) {
+        return from_normalized(v3d.x / 2.0 + 0.5, v3d.y / 2.0 + 0.5, v3d.z / 2.0 + 0.5);
+    }
 };
 
 // Mix two colors a and b. Returns a*u + b*v