From 15dc813fae696f75e7ef5bfb5fd63b273f8b2cec Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Sun, 17 Aug 2025 01:23:44 +0100
Subject: [PATCH] some changes to llWorldPosToHUD. May need more (ofc it is
 opensim)

---
 .../Shared/Api/Implementation/LSL_Api.cs      | 68 ++++++++++---------
 bin/OpenSim.ini.example                       |  2 +-
 2 files changed, 37 insertions(+), 33 deletions(-)

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index aed5289851..d1cda84db8 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -19629,44 +19629,48 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             if(sp is null)
                 return LSL_Vector.Zero;
 
+            int h = sp.ControllingClient.viewHeight;
+            float aspect = h > 0 ?(float)sp.ControllingClient.viewWidth / h : 1f;
+
             Vector3 totarget = (Vector3)wp - sp.CameraPosition;
-            totarget.Normalize();
             float at = totarget.Dot(sp.CameraAtAxis);
             float left = totarget.Dot(sp.CameraLeftAxis);
             float up = totarget.Dot(sp.CameraUpAxis);
 
-            if(atp != (uint)AttachmentPoint.HUDCenter2 && atp != (uint)AttachmentPoint.HUDCenter2)
+            float fov = at * MathF.Tan((float)sp.ControllingClient.FOV * 0.5f);
+            if(fov > 0)
             {
-                int h = sp.ControllingClient.viewHeight;
-                if(h > 0)
-                {
-                    float aspect = 0.5f * (float)sp.ControllingClient.viewWidth / h;
-                    switch(atp)
-                    {
-                        case (uint)AttachmentPoint.HUDTop:
-                            up -= 0.5f;
-                            break;
-                        case (uint)AttachmentPoint.HUDTopLeft:
-                            up -= 0.5f;
-                            left -= aspect;
-                            break;
-                        case (uint)AttachmentPoint.HUDTopRight:
-                            up -= 0.5f;
-                            left += aspect;
-                            break;
-                        case (uint)AttachmentPoint.HUDBottom:
-                            up += 0.5f;
-                            break;
-                        case (uint)AttachmentPoint.HUDBottomLeft:
-                            up += 0.5f;
-                            left -= aspect;
-                            break;
-                        case (uint)AttachmentPoint.HUDBottomRight:
-                            up += 0.5f;
-                            left += aspect;
-                            break;
-                    }
-                }
+                fov = 0.45f / fov;
+                left *= fov;
+                up *= fov;
+            }
+
+            switch(atp)
+            {
+                case (uint)AttachmentPoint.HUDTop:
+                    up -= 0.5f;
+                    break;
+                case (uint)AttachmentPoint.HUDTopLeft:
+                    up -= 0.5f;
+                    left -= 0.5f * aspect;
+                    break;
+                case (uint)AttachmentPoint.HUDTopRight:
+                    up -= 0.5f;
+                    left += 0.5f * aspect;
+                    break;
+                case (uint)AttachmentPoint.HUDBottom:
+                    up += 0.5f;
+                    break;
+                case (uint)AttachmentPoint.HUDBottomLeft:
+                    up += 0.5f;
+                    left -= 0.5f * aspect;
+                    break;
+                case (uint)AttachmentPoint.HUDBottomRight:
+                    up += 0.5f;
+                    left += 0.5f * aspect;
+                    break;
+                default:
+                    break;
             }
             return new(at > 0 ? 1 : -1, left, up);
         }
diff --git a/bin/OpenSim.ini.example b/bin/OpenSim.ini.example
index dbf67c4724..769c163bf7 100644
--- a/bin/OpenSim.ini.example
+++ b/bin/OpenSim.ini.example
@@ -245,7 +245,7 @@
     ;; ZeroMesher is faster but leaves the physics engine to model the mesh
     ;; using the basic shapes that it supports.
     ;; Usually this is only a box or a sphere
-    ;; Default is Meshmerizer
+    ;; Default is ubODEMeshmerizer
     ; meshing = Meshmerizer
     ; meshing = ZeroMesher
     ;; With ubOde physics engine you must select ubODEMeshmerizer