Add scene for presentation title.

ray-tracing-scene/src/examples/mod.rs

@@ -52,12 +52,18 @@ pub fn example_scenes<R: Rng + Debug + 'static>() -> HashMap<&'static str, Box<d
     // let material = Iridescent::new(250.0, 250.0, 1.0, 1.3, 20);
     let material = Iridescent::new(0.9 * 988.0, 0.1 * 988.0, 1.0, 1.5, 20);
     map.insert("sphere", Box::new(sphere::SphereScene::new(material)));
+
+    map.insert(
+        "presentation",
+        Box::new(presentation_title_image::Presentation::new()),
+    );
     map
 }
 
 pub mod basic_cornell;
 pub mod cornell2;
 pub mod mis_test;
+pub mod presentation_title_image;
 pub mod sphere;
 pub mod stanford_dragon;
 pub mod stanford_dragon_as;

ray-tracing-scene/src/examples/presentation_title_image.rs

@@ -0,0 +1,148 @@
+use crate::{
+    parse_obj::ObjData,
+    triangle_bvh::{BVHMaterial, Triangle, TriangleBVH},
+};
+use rand::Rng;
+use ray_tracing_core::{
+    color::Color,
+    light::AreaLight,
+    math::{Dir3, Pos3},
+    prelude::Float,
+};
+use ray_tracing_material::{iridescent::Iridescent, oren_nayar::OrenNayar};
+use std::cell::OnceCell;
+
+use super::ExampleScene;
+
+#[derive(Default)]
+pub struct Presentation<R: Rng> {
+    scene: OnceCell<TriangleBVH<R>>,
+}
+
+impl<R: Rng> Presentation<R> {
+    pub fn new() -> Self {
+        Self {
+            scene: OnceCell::new(),
+        }
+    }
+}
+
+impl<R: Rng + 'static> ExampleScene<R> for Presentation<R> {
+    fn get_scene(&self) -> Box<dyn ray_tracing_core::scene::Scene<R> + Sync> {
+        let s = self.scene.get_or_init(|| {
+            let obj = ObjData::new("ray-tracing-scene/obj/stanford_dragon.obj").unwrap();
+
+            let mut triangles = obj
+                .triangle_faces()
+                .map(|t| Triangle::new(t.v, 4))
+                .collect::<Vec<_>>();
+
+            let materials = vec![
+                BVHMaterial::new_material(OrenNayar::new(0.5, Color::new(0.8, 0.8, 0.8))),
+                BVHMaterial::new_material(OrenNayar::new(0.5, Color::new(0.9, 0.2, 0.2))),
+                BVHMaterial::new_material(OrenNayar::new(0.5, Color::new(0.2, 0.9, 0.2))),
+                BVHMaterial::new_light(AreaLight::new(Color::white() * 30.0)),
+                BVHMaterial::new_material(Iridescent::new(250.0, 250.0, 1.0, 1.5, 20)),
+                BVHMaterial::new_material(Iridescent::new(0.9 * 988.0, 0.1 * 988.0, 1.0, 1.5, 20)),
+                BVHMaterial::new_material(Iridescent::new(0.1 * 500.0, 0.9 * 500.0, 1.0, 1.5, 20)),
+            ];
+
+            let dragon_vertices = obj.vertices.len();
+            let dragon_triangles = triangles.len();
+
+            let mut vertices = obj.vertices;
+            for v in &mut vertices {
+                *v = Pos3::new(v.x() * 0.3, (v.z() + 60.0) * 0.3, -v.y() * 0.3);
+            }
+
+            // second dragon
+            let offset = vertices.len() as u32;
+            for i in 0..dragon_vertices {
+                vertices.push(vertices[i] + Dir3::new(50.0, 0.0, 25.0));
+            }
+
+            for i in 0..dragon_triangles {
+                triangles.push(Triangle::new(
+                    [
+                        triangles[i].vertices[0] + offset,
+                        triangles[i].vertices[1] + offset,
+                        triangles[i].vertices[2] + offset,
+                    ],
+                    5,
+                ));
+            }
+
+            // third dragon
+            let offset = vertices.len() as u32;
+            for i in 0..dragon_vertices {
+                vertices.push(vertices[i] + Dir3::new(-50.0, 0.0, -25.0));
+            }
+
+            for i in 0..dragon_triangles {
+                triangles.push(Triangle::new(
+                    [
+                        triangles[i].vertices[0] + offset,
+                        triangles[i].vertices[1] + offset,
+                        triangles[i].vertices[2] + offset,
+                    ],
+                    6,
+                ));
+            }
+
+            // cornel box
+            let side_length = 400.0;
+            let light_size = 150.0;
+            let light_offset = 0.01;
+            let offset = vertices.len() as u32;
+            vertices.extend_from_slice(&[
+                Pos3::new(side_length, 2.0 * side_length, side_length),
+                Pos3::new(side_length, 2.0 * side_length, -side_length),
+                Pos3::new(side_length, 0.0, side_length),
+                Pos3::new(side_length, 0.0, -side_length),
+                Pos3::new(-side_length, 2.0 * side_length, side_length),
+                Pos3::new(-side_length, 2.0 * side_length, -side_length),
+                Pos3::new(-side_length, 0.0, side_length),
+                Pos3::new(-side_length, 0.0, -side_length),
+                Pos3::new(light_size, 2.0 * side_length - light_offset, light_size),
+                Pos3::new(light_size, 2.0 * side_length - light_offset, -light_size),
+                Pos3::new(-light_size, 2.0 * side_length - light_offset, light_size),
+                Pos3::new(-light_size, 2.0 * side_length - light_offset, -light_size),
+            ]);
+
+            triangles.extend_from_slice(&[
+                Triangle::new([offset, 1 + offset, 2 + offset], 0),
+                Triangle::new([1 + offset, 3 + offset, 2 + offset], 0),
+                Triangle::new([offset, 4 + offset, 1 + offset], 0),
+                Triangle::new([1 + offset, 4 + offset, 5 + offset], 0),
+                Triangle::new([2 + offset, 3 + offset, 6 + offset], 0),
+                Triangle::new([3 + offset, 7 + offset, 6 + offset], 0),
+                Triangle::new([offset, 2 + offset, 4 + offset], 1),
+                Triangle::new([6 + offset, 4 + offset, 2 + offset], 1),
+                Triangle::new([1 + offset, 5 + offset, 3 + offset], 2),
+                Triangle::new([7 + offset, 3 + offset, 5 + offset], 2),
+                Triangle::new([8 + offset, 10 + offset, 9 + offset], 3),
+                Triangle::new([11 + offset, 9 + offset, 10 + offset], 3),
+            ]);
+
+            TriangleBVH::new(vertices, triangles, materials)
+        });
+
+        Box::new(s.clone())
+    }
+
+    fn get_camera_pos(&self) -> Pos3 {
+        Pos3::new(-150.0, 160.0, 250.0)
+    }
+
+    fn get_camera_look_at(&self) -> Pos3 {
+        Pos3::new(0.0, 15.0, 0.0)
+    }
+
+    fn get_camera_up(&self) -> Dir3 {
+        Dir3::up()
+    }
+
+    fn get_horizontal_fov(&self) -> Float {
+        Float::to_radians(90.0)
+    }
+}

ray-tracing-scene/src/triangle_bvh.rs

@@ -84,8 +84,8 @@ enum Node {
 
 #[derive(Debug, Clone, Copy)]
 pub struct Triangle {
-    vertices: [Index; 3],
+    pub vertices: [Index; 3],
-    material: Index,
+    pub material: Index,
 }
 
 impl Triangle {