gamma

src/camera.rs

@@ -2,7 +2,7 @@ use std::fs::File;
 use std::io::{BufWriter};
 
 use crate::hittable::HittableList;
-use crate::math_utils::clamp;
+use crate::math_utils::{clamp, linear_to_gamma};
 use crate::ppm_writer::PPMWriter;
 use crate::types_defined::{Camera, Color, Point, Ray, Vec3};
 use rand::rngs::ThreadRng;
@@ -83,12 +83,12 @@ impl<'a> Camera<'a> {
 
                 // clamp color rgb
                 let color_clamped = Color::new(
-                    clamp(color.x, 0.0, 1.0),
-                    clamp(color.y, 0.0, 1.0),
-                    clamp(color.z, 0.0, 1.0),
+                    clamp(linear_to_gamma(color.x), 0.0, 1.0),
+                    clamp(linear_to_gamma(color.y), 0.0, 1.0),
+                    clamp(linear_to_gamma(color.z), 0.0, 1.0),
                 );
 
-                self.ppm_file_writer.write(color.to_color());
+                let _ = self.ppm_file_writer.write(color_clamped.to_color());
 
                 
                 // content

src/math_utils.rs

@@ -7,4 +7,12 @@ pub fn clamp(value: f32, low: f32, high: f32) -> f32 {
         return high;
     }
     return value;
+}
+
+pub fn linear_to_gamma(value: f32) -> f32 {
+    if value > 0.0 {
+        value.sqrt()
+    } else {
+        0.0
+    }
 }