From 597799a979c29e39575b5a06fc3b397fb159fb1a Mon Sep 17 00:00:00 2001
From: Lynn <62256001+solis-lumine-vorago@users.noreply.github.com>
Date: Wed, 10 Apr 2024 19:59:58 +0200
Subject: [PATCH] Add tetrahedron gizmos (#12914)
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# Objective

- Adds tetrahedron gizmos, suggestion of #9400

## Solution

- Implement tetrahedron gizmos as a `gizmos.primitive_3d`

## Additional info

Here is a short video of the default tetrahedron :)


https://github.com/bevyengine/bevy/assets/62256001/a6f31b6f-78bc-4dc2-8f46-2ebd04ed8a0e

---------

Co-authored-by: François Mockers <francois.mockers@vleue.com>
---
 crates/bevy_gizmos/src/primitives/dim3.rs | 31 ++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/crates/bevy_gizmos/src/primitives/dim3.rs b/crates/bevy_gizmos/src/primitives/dim3.rs
index c34d9ba234..9f1f38890a 100644
--- a/crates/bevy_gizmos/src/primitives/dim3.rs
+++ b/crates/bevy_gizmos/src/primitives/dim3.rs
@@ -6,7 +6,7 @@ use std::f32::consts::TAU;
 use bevy_color::Color;
 use bevy_math::primitives::{
     BoxedPolyline3d, Capsule3d, Cone, ConicalFrustum, Cuboid, Cylinder, Line3d, Plane3d,
-    Polyline3d, Primitive3d, Segment3d, Sphere, Torus,
+    Polyline3d, Primitive3d, Segment3d, Sphere, Tetrahedron, Torus,
 };
 use bevy_math::{Dir3, Quat, Vec3};
 
@@ -943,3 +943,32 @@ impl<T: GizmoConfigGroup> Drop for Torus3dBuilder<'_, '_, '_, T> {
             });
     }
 }
+
+// tetrahedron
+
+impl<'w, 's, T: GizmoConfigGroup> GizmoPrimitive3d<Tetrahedron> for Gizmos<'w, 's, T> {
+    type Output<'a> = () where Self: 'a;
+
+    fn primitive_3d(
+        &mut self,
+        primitive: Tetrahedron,
+        position: Vec3,
+        rotation: Quat,
+        color: impl Into<Color>,
+    ) -> Self::Output<'_> {
+        if !self.enabled {
+            return;
+        }
+
+        let [a, b, c, d] = primitive
+            .vertices
+            .map(rotate_then_translate_3d(rotation, position));
+
+        let lines = [(a, b), (a, c), (a, d), (b, c), (b, d), (c, d)];
+
+        let color = color.into();
+        for (a, b) in lines.into_iter() {
+            self.line(a, b, color);
+        }
+    }
+}