finally something gets rendered

src/EngineSharp.Core/EngineSharp.Core/OpenGLEngine.cs

@@ -114,6 +114,8 @@ internal class OpenGLEngine : Engine
 
     private void OnRender(double deltaTime)
     {
+        _gl.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
+        
         var projectionMatrix = _camera.ProjectionMatrix;
         var viewMatrix = _camera.ViewMatrix;
         

src/EngineSharp.Core/EngineSharp.Core/Rendering/Mesh.cs

@@ -6,6 +6,8 @@ namespace EngineSharp.Core.Rendering;
 public class Mesh
 {
     public required Material Material { get; set; }
+    
+    // Could make these an ImmutableList. Therefore I know the data won't get changed and I only need to regenerate the renderable mesh (in the MeshRenderer) if the mesh has actually changed
     public Vector3D<float>[] Vertices { get; set; } = [];
     public Vector3D<float>[] Normals { get; set; } = [];
     public uint[] Indices { get; set; } = [];
@@ -37,7 +39,7 @@ public class Mesh
             Normals[i1] += normal;
             Normals[i2] += normal;
         }
-
+        
         for (var i = 0; i < Normals.Length; i++)
         {
             Normals[i] = Vector3D.Normalize(Normals[i]); // smoothing for shared vertices

src/EngineSharp/assets/shaders/sphere.frag

@@ -9,5 +9,5 @@ in vec3 Normal;
 void main()
 {
     vec3 col = vec3(1.0, 0.5, 0.2) * FragPos;
-    FragColor = vec4(1);
+    FragColor = vec4(col, 1.0f);
 }