rtiow: implement EnvMap in parser.

rtiow/tracer/configs/test.toml

@@ -1,12 +1,12 @@
 [scene]
 width = 768
 height = 768
-subsamples = 1000
+#subsamples = 1000
 
 [camera]
-lookfrom = [0.0, 10.0, 0.0]
+lookfrom = [0.0, 10.0, -100.0]
 lookat = [0.0, 0.0, 0.0]
-fov = 45.0
+fov = 45
 aspect = 1
 aperture = 0.0
 focus_dist = 10.0
@@ -22,3 +22,6 @@ radius = 10
 [[spheres]]
 center = [-30.0, 0.0, 0.0]
 radius = 10
+
+[envmap]
+path = "/home/wathiede/src/xinu.tv/raytracers/rtiow/renderer/images/52681723945_e1d94d3df9_6k.jpg"

rtiow/tracer/src/main.rs

@@ -65,7 +65,7 @@ fn main() -> Result<()> {
             let s = std::fs::read_to_string(config)?;
             let cfg: Config = toml::from_str(&s)?;
             println!("{:#?}", cfg);
-            cfg.into()
+            cfg.try_into()?
         }
         _ => unreachable!(),
     };