From f71056b9b42174fbc2668bac5ca362bc459a8e28 Mon Sep 17 00:00:00 2001
From: Silas Bartha <silas@exvacuum.dev>
Date: Wed, 12 Feb 2025 21:21:29 -0500
Subject: server-side message position validation with o3d

---
 api/api.py                |  15 +++++++++++++++
 api/terrain.glb           | Bin 0 -> 40097796 bytes
 src/assets/terrain.glb    | Bin 39846888 -> 40097796 bytes
 src/components/ground.jsx |   9 +++++----
 4 files changed, 20 insertions(+), 4 deletions(-)
 create mode 100644 api/terrain.glb

diff --git a/api/api.py b/api/api.py
index 3b74bfc..eb27f27 100644
--- a/api/api.py
+++ b/api/api.py
@@ -4,8 +4,11 @@ from uuid import uuid4
 import sqlite3
 import numbers
 from flask import g
+import open3d
+import numpy
 
 DATABASE = './forum.db'
+TERRAIN_MODEL = './terrain.glb'
 
 def get_db():
     db = getattr(g, '__database', None)
@@ -15,6 +18,13 @@ def get_db():
 
 app = Flask(__name__)
 
+terrain_mesh = open3d.io.read_triangle_mesh('./terrain.glb')
+terrain_mesh = open3d.t.geometry.TriangleMesh.from_legacy(terrain_mesh)
+print('loaded terrain mesh')
+scene = open3d.t.geometry.RaycastingScene()
+_ = scene.add_triangles(terrain_mesh)
+print('created raycasting scene')
+
 @app.teardown_appcontext
 def close_connection(_):
     db = getattr(g, '__database', None)
@@ -41,6 +51,11 @@ def new_message():
     for elem in position:
         if not isinstance(elem, numbers.Number):
             return Response(status=HTTPStatus.BAD_REQUEST)
+    query_point = open3d.core.Tensor([position], dtype=open3d.core.Dtype.Float32)
+    unsigned_distance = scene.compute_distance(query_point)
+    print(unsigned_distance)
+    if unsigned_distance > 0.25:
+        return Response(status=HTTPStatus.BAD_REQUEST)
     position = json.dumps(position)
     message = str(request.form['message'])
     token = request.form['token']
diff --git a/api/terrain.glb b/api/terrain.glb
new file mode 100644
index 0000000..515ee50
Binary files /dev/null and b/api/terrain.glb differ
diff --git a/src/assets/terrain.glb b/src/assets/terrain.glb
index 4ffde3c..515ee50 100644
Binary files a/src/assets/terrain.glb and b/src/assets/terrain.glb differ
diff --git a/src/components/ground.jsx b/src/components/ground.jsx
index 9aced45..2426f2a 100644
--- a/src/components/ground.jsx
+++ b/src/components/ground.jsx
@@ -5,14 +5,15 @@ import { useGLTF } from '@react-three/drei';
 import terrainModelURL from '../assets/terrain.glb';
 
 export default function Ground() {
-    const meshRef = useRef();
-    const { nodes } = useGLTF(terrainModelURL);
-    
+    const { nodes, materials } = useGLTF(terrainModelURL);
     return (
         <RigidBody type='fixed' colliders="trimesh">
-            <mesh ref={meshRef} position={[0, 0, 0]} rotation={[-Math.PI / 2, 0, 0]} geometry={nodes.Plane.geometry} name='ground'>
+            <mesh position={[0, 0, 0]} geometry={nodes.ground.geometry} name='ground'>
                 <meshStandardMaterial color={everforest.yellow}/>
             </mesh>
+            <mesh geometry={nodes.pyramid.geometry} name='ground'>
+                <meshStandardMaterial color={everforest.bg2}/>
+            </mesh>
         </RigidBody>
     );
 }
-- 
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