Add some bodies

engine/src/scene/content/components/bounding_box.rs

@@ -12,6 +12,23 @@ pub struct BoundingBox {
 }
 
 impl BoundingBox {
+    pub fn init() -> Self {
+        Self {
+            min: [f32::INFINITY; 3],
+            max: [-f32::INFINITY; 3],
+        }
+    }
+
+    pub fn check(&mut self, v: Vector3<f32>) {
+        self.min[0] = self.min[0].min(v.x);
+        self.min[1] = self.min[1].min(v.y);
+        self.min[2] = self.min[2].min(v.z);
+
+        self.max[0] = self.max[0].max(v.x);
+        self.max[1] = self.max[1].max(v.y);
+        self.max[2] = self.max[2].max(v.z);
+    }
+
     pub fn is_zero(&self) -> bool {
         self.min[0] == 0.0
             && self.min[1] == 0.0

engine/src/scene/rendering/shaders/raytracing/hardware/default/closesthit.rchit

@@ -111,7 +111,7 @@ void own_implementation() {
         int miss_shader_index = 0;
         int sbt_record_stride = 0;
         float tmin = 0.001;
-        float tmax = 10000.0;
+        float tmax = 1000000000.0;
 
         vec3 direction = reflect(gl_WorldRayDirectionEXT, normal);
 
@@ -145,7 +145,7 @@ void own_implementation() {
         int miss_shader_index = 0;
         int sbt_record_stride = 0;
         float tmin = 0.001;
-        float tmax = 10000.0;
+        float tmax = 1000000000.0;
 
         pay_load.depth++;
 

engine/src/scene/rendering/shaders/raytracing/hardware/default/raygen.rgen

@@ -41,7 +41,7 @@ void main()
     int miss_shader_index = 0;
     int sbt_record_stride = 0;
     float tmin = 0.001;
-    float tmax = 10000.0;
+    float tmax = 1000000000.0;
 
     pay_load.depth = 0;
 

examples/free_space/src/celestial_object.rs

@@ -1,3 +1,4 @@
+use core::f32;
 use std::time::Duration;
 
 use anyhow::Result;
@@ -8,21 +9,57 @@ use engine::prelude::{
 };
 use hexasphere::shapes::IcoSphere;
 
+#[derive(Clone, Copy, Debug)]
+pub enum CelestialClass {
+    Sun,
+    Solid,
+    Gas,
+}
+
+impl CelestialClass {
+    /// in g/cm³
+    pub fn density(&self) -> f32 {
+        match self {
+            // our sun
+            CelestialClass::Sun => 1.41,
+
+            // earth
+            CelestialClass::Solid => 5.51,
+
+            // saturn
+            CelestialClass::Gas => 0.69,
+        }
+    }
+
+    pub fn color(&self) -> [f32; 4] {
+        match self {
+            CelestialClass::Sun => Color::Yellow.into(),
+            CelestialClass::Solid => Color::Green.into(),
+            CelestialClass::Gas => Color::Orange.into(),
+        }
+    }
+}
+
 pub struct CelestialObject;
 
 impl CelestialObject {
     pub fn new(
         world: &mut World,
+        class: CelestialClass,
         subdivisions: usize,
         celestial_reference: impl Into<Option<Entity>>,
     ) -> Result<EntityObject> {
         let mut entity_object = AssetHandler::create(world).empty_entity();
 
-        let celestial_settings = CelestialObjectSettings::default();
-        let draw = Draw::new(vec![Self::create_asset(world, subdivisions)?]);
+        let mut celestial_settings = CelestialObjectSettings::default();
+        celestial_settings.density = class.density();
+
+        let (mesh, bounding_box) = Self::create_asset(world, class, subdivisions)?;
+        let draw = Draw::new(vec![mesh]);
         draw.set_transform(celestial_settings.model_matrix())?;
 
         entity_object.insert_component(draw);
+        entity_object.insert_component(bounding_box);
         entity_object.insert_component(celestial_settings);
 
         if let Some(e) = celestial_reference.into() {
@@ -32,13 +69,19 @@ impl CelestialObject {
         Ok(entity_object)
     }
 
-    fn create_asset(world: &World, subdivisions: usize) -> Result<AssetMesh> {
+    fn create_asset(
+        world: &World,
+        class: CelestialClass,
+        subdivisions: usize,
+    ) -> Result<(AssetMesh, BoundingBox)> {
         let context = world.resources.get::<Context>();
         let scene = world.resources.get::<Scene>();
 
         let command_buffer = CommandBuffer::new_primary()
             .build(context.device().clone(), context.queue().clone())?;
 
+        let (sphere, bounding_box) = Self::create_sphere(subdivisions);
+
         let buffer = {
             let mut recorder = command_buffer.begin(VkCommandBufferBeginInfo::new(
                 VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT,
@@ -48,7 +91,7 @@ impl CelestialObject {
                 .set_memory_usage(MemoryUsage::CpuToGpu)
                 .set_usage(VK_BUFFER_USAGE_TRANSFER_SRC_BIT)
                 .set_data(
-                    &Self::create_sphere(subdivisions)
+                    &sphere
                         .into_iter()
                         .map(|(v, n)| PositionNormal::new(v, n))
                         .collect::<Vec<_>>(),
@@ -83,6 +126,7 @@ impl CelestialObject {
             None,
             None,
             PrimitiveMaterial {
+                color: class.color(),
                 emissive_factor: [0.65, 0.65, 0.65],
                 metallic_factor: 0.5,
                 roughness_factor: 0.7,
@@ -92,35 +136,44 @@ impl CelestialObject {
             false,
         )?;
 
-        Ok(asset_mesh)
+        Ok((asset_mesh, bounding_box))
     }
 
-    fn create_sphere(subdivisions: usize) -> Vec<(Vector3<f32>, Vector3<f32>)> {
+    fn create_sphere(subdivisions: usize) -> (Vec<(Vector3<f32>, Vector3<f32>)>, BoundingBox) {
+        let mut bounding_box = BoundingBox::init();
         let sphere = IcoSphere::new(subdivisions, |_| ());
 
         let points = sphere
             .raw_points()
             .into_iter()
-            .map(|v| Vector3::from(v.to_array()))
+            .map(|v| {
+                let v = Vector3::from(v.to_array());
+                bounding_box.check(v);
+
+                v
+            })
             .collect::<Vec<Vector3<f32>>>();
 
-        sphere
-            .get_all_indices()
-            .chunks(3)
-            .map(|triangle| {
-                let p1 = points[triangle[0] as usize];
-                let p2 = points[triangle[1] as usize];
-                let p3 = points[triangle[2] as usize];
+        (
+            sphere
+                .get_all_indices()
+                .chunks(3)
+                .map(|triangle| {
+                    let p1 = points[triangle[0] as usize];
+                    let p2 = points[triangle[1] as usize];
+                    let p3 = points[triangle[2] as usize];
 
-                let v1 = p1 - p2;
-                let v2 = p1 - p3;
+                    let v1 = p1 - p2;
+                    let v2 = p1 - p3;
 
-                let n = v2.cross(v1);
+                    let n = v2.cross(v1);
 
-                [(p1, n), (p2, n), (p3, n)]
-            })
-            .flatten()
-            .collect()
+                    [(p1, n), (p2, n), (p3, n)]
+                })
+                .flatten()
+                .collect(),
+            bounding_box,
+        )
     }
 }
 
@@ -135,8 +188,18 @@ pub struct CelestialObjectSettings {
 }
 
 impl CelestialObjectSettings {
-    fn model_matrix(&self) -> Matrix4<f32> {
-        Matrix4::from_translation(self.location) * Matrix4::from_scale(self.radius)
+    const SCALE: f32 = 0.5;
+
+    fn volume(&self) -> f32 {
+        (4.0 / 3.0) * f32::consts::PI * self.radius.powi(3)
+    }
+
+    fn mass(&self) -> f32 {
+        self.volume() * self.density
+    }
+
+    pub fn model_matrix(&self) -> Matrix4<f32> {
+        Matrix4::from_translation(self.location) * Matrix4::from_scale(self.radius * Self::SCALE)
     }
 
     pub fn update(
@@ -145,6 +208,10 @@ impl CelestialObjectSettings {
         draw: &Draw,
         celestial_object_settings_reference: &CelestialObjectSettings,
     ) -> Result<()> {
+        self.last_update = now;
+
+        // TODO: velocity calculation around celestial reference
+
         Ok(())
     }
 }
@@ -153,7 +220,7 @@ impl Default for CelestialObjectSettings {
     fn default() -> Self {
         Self {
             location: Vector3::zero(),
-            radius: 1.0,
+            radius: 2.0,
             density: 1.0,
             velocity: 0.0,
 

examples/free_space/src/game.rs

@@ -8,7 +8,12 @@ use engine::prelude::{
     *,
 };
 
-use crate::{FREE_CAMERA_CONTROL, celestial_object::CelestialObject};
+use crate::{
+    FREE_CAMERA_CONTROL,
+    celestial_object::{
+        CelestialClass, CelestialObject, CelestialObjectSettings, CelestialReference,
+    },
+};
 
 #[derive(Clone, Copy, Debug)]
 struct PlayerEntity(Entity);
@@ -264,6 +269,20 @@ impl Game {
             world_builder.add_update("camera_position", 1_000, Self::camera_update, EmptyFilter)?;
         }
 
+        world_builder.add_update(
+            "celestial velocity update",
+            100,
+            Self::celestial_velocity_update,
+            (EmptyFilter, EmptyFilter),
+        )?;
+
+        world_builder.add_update(
+            "celestial buffer update",
+            110,
+            Self::celestial_buffer_update,
+            EmptyFilter,
+        )?;
+
         Ok(())
     }
 
@@ -278,7 +297,16 @@ impl Game {
         // world.resources.insert(player);
         world.resources.insert(InputSettings::default());
 
-        let example_planet = CelestialObject::new(world, 5, None)?;
+        let mut example_sun = CelestialObject::new(world, CelestialClass::Sun, 5, None)?;
+        let sun_settings = example_sun.get_component_mut::<CelestialObjectSettings>()?;
+        sun_settings.location = vec3(10_000.0, 10_000.0, 0.0);
+        sun_settings.radius = 1_000.0;
+        let sun_entity = world.add_entity(example_sun)?;
+
+        let mut example_planet = CelestialObject::new(world, CelestialClass::Solid, 5, sun_entity)?;
+        let sun_settings = example_planet.get_component_mut::<CelestialObjectSettings>()?;
+        sun_settings.location.x = 1000.0;
+        sun_settings.radius = 250.0;
         world.add_entity(example_planet)?;
 
         let context = world.resources.get::<Context>();
@@ -325,4 +353,32 @@ impl Game {
 
         view.update_buffer()
     }
+
+    fn celestial_buffer_update(
+        _: &mut World,
+        _: Entity,
+        draw: &mut Draw,
+        control: &mut CelestialObjectSettings,
+    ) -> Result<()> {
+        draw.set_transform(control.model_matrix())?;
+
+        Ok(())
+    }
+
+    fn celestial_velocity_update(
+        world: &mut World,
+        (_, draw, lhs_control, reference): (
+            Entity,
+            &mut Draw,
+            &mut CelestialObjectSettings,
+            &mut CelestialReference,
+        ),
+        (rhs_entity, rhs_control): (Entity, &mut CelestialObjectSettings),
+    ) -> Result<()> {
+        if reference.entity == rhs_entity {
+            lhs_control.update(world.now(), draw, rhs_control)?;
+        }
+
+        Ok(())
+    }
 }