Add VBSP lump 29

SabreTools.Models/BSP/PhysCollideLump.cs

@@ -0,0 +1,11 @@
+namespace SabreTools.Models.BSP
+{
+    /// <see href="https://developer.valvesoftware.com/wiki/BSP_(Source)"/>
+    public sealed class PhysCollideLump : Lump
+    {
+        /// <summary>
+        /// Models
+        /// </summary>
+        public PhysModel[]? Models { get; set; }
+    }
+}

SabreTools.Models/BSP/PhysModel.cs

@@ -0,0 +1,42 @@
+using System.Runtime.InteropServices;
+
+namespace SabreTools.Models.BSP
+{
+    /// <summary>
+    /// The physcollide lump (Lump 29) contains physics data for the world.
+    /// </summary>
+    /// <see href="https://developer.valvesoftware.com/wiki/BSP_(Source)"/>
+    [StructLayout(LayoutKind.Sequential)]
+    public sealed class PhysModel
+    {
+        /// <summary>
+        /// Perhaps the index of the model to which this physics model applies?
+        /// </summary>
+        public int ModelIndex;
+
+        /// <summary>
+        /// Total size of the collision data sections
+        /// </summary>
+        public int DataSize;
+
+        /// <summary>
+        /// Size of the text section
+        /// </summary>
+        public int KeydataSize;
+
+        /// <summary>
+        /// Number of collision data sections
+        /// </summary>
+        public int SolidCount;
+
+        /// <summary>
+        /// Collision data of length <see cref="SolidCount"/> 
+        /// </summary>
+        public PhysSolid[]? Solids;
+
+        /// <summary>
+        /// Key data of size <see cref="KeydataSize"/> 
+        /// </summary>
+        public byte[]? TextData;
+    }
+}

SabreTools.Models/BSP/PhysSolid.cs

@@ -0,0 +1,25 @@
+using System.Runtime.InteropServices;
+
+namespace SabreTools.Models.BSP
+{
+    /// <summary>
+    /// The last two parts appear to be identical to the PHY file format,
+    /// which means their exact contents are unknown. Note that the
+    /// compactsurfaceheader_t structure contains the data size of each
+    /// collision data section (including the rest of the header)
+    /// </summary>
+    /// <see href="https://developer.valvesoftware.com/wiki/BSP_(Source)"/>
+    [StructLayout(LayoutKind.Sequential)]
+    public sealed class PhysSolid
+    {
+        /// <summary>
+        /// Size of the collision data
+        /// </summary>
+        public int Size;
+
+        /// <summary>
+        /// Collision data of length <see cref="Size"/> 
+        /// </summary>
+        public byte[]? CollisionData;
+    }
+}

SabreTools.Models/BSP/VbspFile.cs

@@ -166,8 +166,10 @@ namespace SabreTools.Models.BSP
         /// TODO: Find definition and implement
         // public PhysDispLump? PhysDispLump { get; set; }
 
-        // TODO: Implement Lump 29
-        // https://developer.valvesoftware.com/wiki/BSP_(Source)#Physics
+        /// <summary>
+        /// LUMP_PHYSCOLLIDE [29]
+        /// </summary>
+        public PhysCollideLump? PhysCollideLump { get; set; }
 
         /// <summary>
         /// LUMP_VERTNORMALS [30]