tirbofish/dropbear · commit

d18cb60e38502095cea8a533bca61b0f0add9f26

wip: implementing new classes such as SceneMetadata.kt, ResourceReference.kt and AssetEntry.kt wip: attempts to do viewport clicking within the editor. would be good for stuff like interactive UI in billboarding (idk if its implemented yet). fix: changed default ambient strength to 0.1 instead of 1.0 to not make it look like its bad

Thribhu K <4tkbytes@pm.me> · 2026-03-25 13:37

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diff --git a/crates/eucalyptus-core/src/input.rs b/crates/eucalyptus-core/src/input.rs
index 501bbf5..2eca9a2 100644
--- a/crates/eucalyptus-core/src/input.rs
+++ b/crates/eucalyptus-core/src/input.rs
@@ -1,6 +1,7 @@
 //! Input management and input state.
 
 pub mod gamepad;
+pub mod ndc;
 
 use crate::scripting::jni::utils::ToJObject;
 use crate::scripting::native::DropbearNativeError;
diff --git a/crates/eucalyptus-core/src/input/ndc.rs b/crates/eucalyptus-core/src/input/ndc.rs
new file mode 100644
index 0000000..fd1bc89
--- /dev/null
+++ b/crates/eucalyptus-core/src/input/ndc.rs
@@ -0,0 +1,62 @@
+use glam::{Vec3, Mat4, Vec4};
+
+/// Helpers for converting from a 2D display to a 3D object, such as billboard ui and some
+/// other applications.
+// viewport aint even work lmaoooo
+pub struct NormalisedDeviceCoordinates;
+
+impl NormalisedDeviceCoordinates {
+    pub fn screen_to_ray(
+        touch_pos: impl Into<[f32; 2]>,
+        screen_dims: impl Into<[f32; 2]>,
+        inv_proj: Mat4,
+        inv_view: Mat4,
+    ) -> (Vec3, Vec3) {
+        let [touch_x, touch_y] = touch_pos.into();
+        let [screen_width, screen_height] = screen_dims.into();
+
+        let ndc_x =  (touch_x / screen_width)  * 2.0 - 1.0;
+        let ndc_y = -(touch_y / screen_height) * 2.0 + 1.0; // flip Y, screen Y is down
+
+        // unproject to view space
+        let clip_near = Vec4::new(ndc_x, ndc_y, 0.0, 1.0); // z=0 = near plane
+        let mut view_near = inv_proj * clip_near;
+        view_near /= view_near.w;
+
+        // to world space
+        let world_near = inv_view * view_near;
+
+        // ray origin = camera position, direction = toward unprojected point
+        let ray_origin = (inv_view * Vec4::new(0.0, 0.0, 0.0, 1.0)).truncate();
+        let ray_dir    = (world_near.truncate() - ray_origin).normalize();
+

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