rtiow: change scene to aid in debugging.

rtiow/renderer/src/scenes/stltest.rs

@@ -16,7 +16,7 @@ use crate::{
 };
 
 pub fn new(opt: &Opt) -> Scene {
-    let lookfrom = Vec3::new(100., 200., 200.);
+    let lookfrom = Vec3::new(-100., 200., 200.);
     let lookat = Vec3::new(0., 1., 0.);
     let dist_to_focus = 10.0;
     let aperture = 0.0;
@@ -26,7 +26,7 @@ pub fn new(opt: &Opt) -> Scene {
         lookfrom,
         lookat,
         Vec3::new(0., 1., 0.),
-        20.,
+        45.,
         opt.width as f32 / opt.height as f32,
         aperture,
         dist_to_focus,
@@ -36,7 +36,7 @@ pub fn new(opt: &Opt) -> Scene {
     let ground_color = if opt.use_accel {
         ConstantTexture::new(Vec3::new(1.0, 0.4, 0.4))
     } else {
-        ConstantTexture::new(Vec3::new(0.4, 1.0, 0.4))
+        ConstantTexture::new(Vec3::new(0.4, 0.4, 0.4))
     };
 
     let stl_cube = STL::parse(
@@ -48,7 +48,7 @@ pub fn new(opt: &Opt) -> Scene {
     let light_height = 200.;
     let tri_mesh = Triangles::new(
         &stl_cube,
-        Lambertian::new(ConstantTexture::new(Vec3::new(1., 0.1, 0.1))),
+        Lambertian::new(ConstantTexture::new(Vec3::new(1., 1., 1.))),
         1.,
     );
     dbg!(tri_mesh.triangles.len(), tri_mesh.bbox);

rtiow/renderer/src/triangles.rs

@@ -83,6 +83,7 @@ where
 {
     // Based on https://www.scratchapixel.com/lessons/3d-basic-rendering/ray-tracing-rendering-a-triangle/ray-triangle-intersection-geometric-solution.html
     fn hit(&self, r: Ray, _t_min: f32, _t_max: f32) -> Option<HitRecord> {
+        // TODO(wathiede): add an acceleration structure to more cheaply skip some triangles.
         for tri in &self.triangles {
             let n = tri.normal;