feat(rendering): distance fog and config-derived far plane

Rendering/Camera.cs

@@ -10,6 +10,7 @@ public sealed class Camera
     public float Yaw { get; private set; } = -90f;   // degrees; -90 looks down -Z
     public float Pitch { get; private set; }         // degrees
     public float Fov { get; set; } = 60f;            // degrees
+    public float FarPlane { get; set; } = 100f;      // world units
     public float AspectRatio { get; set; }
 
     public Vector3 Front { get; private set; } = -Vector3.UnitZ;
@@ -36,7 +37,7 @@ public sealed class Camera
 
     public Matrix4 GetProjectionMatrix() =>
         Matrix4.CreatePerspectiveFieldOfView(
-            MathHelper.DegreesToRadians(this.Fov), this.AspectRatio, 0.1f, 100f);
+            MathHelper.DegreesToRadians(this.Fov), this.AspectRatio, 0.1f, this.FarPlane);
 
     private void UpdateVectors()
     {

Rendering/Shader.cs

@@ -39,6 +39,9 @@ public sealed class Shader : IDisposable
     public void SetFloat(string name, float value) =>
         GL.Uniform1(this.Location(name), value);
 
+    public void SetVector3(string name, Vector3 value) =>
+        GL.Uniform3(this.Location(name), value.X, value.Y, value.Z);
+
     private int Location(string name)
     {
         if (this._uniforms.TryGetValue(name, out int location)) return location;