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diff --git a/src/3dengfx/libs/lib3ds/shadow.c b/src/3dengfx/libs/lib3ds/shadow.c
new file mode 100644
index 0000000..a38f13c
--- /dev/null
+++ b/src/3dengfx/libs/lib3ds/shadow.c
@@ -0,0 +1,160 @@
+/*
+ * The 3D Studio File Format Library
+ * Copyright (C) 1996-2001 by J.E. Hoffmann <je-h@gmx.net>
+ * All rights reserved.
+ *
+ * This program is  free  software;  you can redistribute it and/or modify it
+ * under the terms of the  GNU Lesser General Public License  as published by 
+ * the  Free Software Foundation;  either version 2.1 of the License,  or (at 
+ * your option) any later version.
+ *
+ * This  program  is  distributed in  the  hope that it will  be useful,  but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or  FITNESS FOR A  PARTICULAR PURPOSE.  See the  GNU Lesser General Public  
+ * License for more details.
+ *
+ * You should  have received  a copy of the GNU Lesser General Public License
+ * along with  this program;  if not, write to the  Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: shadow.c,v 1.8 2001/07/07 19:05:30 jeh Exp $
+ */
+#define LIB3DS_EXPORT
+#include <lib3ds/shadow.h>
+#include <lib3ds/chunk.h>
+#include <lib3ds/io.h>
+#include <math.h>
+
+
+/*!
+ * \defgroup shadow Shadow Map Settings
+ *
+ * \author J.E. Hoffmann <je-h@gmx.net>
+ */
+
+
+/*!
+ * \ingroup shadow 
+ */
+Lib3dsBool
+lib3ds_shadow_read(Lib3dsShadow *shadow, Lib3dsIo *io)
+{
+  Lib3dsChunk c;
+
+  if (!lib3ds_chunk_read(&c, io)) {
+    return(LIB3DS_FALSE);
+  }
+  
+  switch (c.chunk) {
+    case LIB3DS_SHADOW_MAP_SIZE:
+      {
+        shadow->map_size=lib3ds_io_read_intw(io);
+      }
+      break;
+    case LIB3DS_LO_SHADOW_BIAS:
+      {
+          shadow->lo_bias=lib3ds_io_read_float(io);
+      }
+      break;
+    case LIB3DS_HI_SHADOW_BIAS:
+      {
+        shadow->hi_bias=lib3ds_io_read_float(io);
+      }
+      break;
+    case LIB3DS_SHADOW_SAMPLES:
+      {
+        shadow->samples=lib3ds_io_read_intw(io);
+      }
+      break;
+    case LIB3DS_SHADOW_RANGE:
+      {
+        shadow->range=lib3ds_io_read_intd(io);
+      }
+      break;
+    case LIB3DS_SHADOW_FILTER:
+      {
+        shadow->filter=lib3ds_io_read_float(io);
+      }
+      break;
+    case LIB3DS_RAY_BIAS:
+      {
+        shadow->ray_bias=lib3ds_io_read_float(io);
+      }
+      break;
+  }
+  
+  return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup shadow 
+ */
+Lib3dsBool
+lib3ds_shadow_write(Lib3dsShadow *shadow, Lib3dsIo *io)
+{
+  if (fabs(shadow->lo_bias)>LIB3DS_EPSILON) { /*---- LIB3DS_LO_SHADOW_BIAS ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_LO_SHADOW_BIAS;
+    c.size=10;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_float(io, shadow->lo_bias);
+  }
+
+  if (fabs(shadow->hi_bias)>LIB3DS_EPSILON) { /*---- LIB3DS_HI_SHADOW_BIAS ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_HI_SHADOW_BIAS;
+    c.size=10;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_float(io, shadow->hi_bias);
+  }
+
+  if (shadow->map_size) { /*---- LIB3DS_SHADOW_MAP_SIZE ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_SHADOW_MAP_SIZE;
+    c.size=8;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_intw(io, shadow->map_size);
+  }
+  
+  if (shadow->samples) { /*---- LIB3DS_SHADOW_SAMPLES ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_SHADOW_SAMPLES;
+    c.size=8;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_intw(io, shadow->samples);
+  }
+
+  if (shadow->range) { /*---- LIB3DS_SHADOW_RANGE ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_SHADOW_RANGE;
+    c.size=10;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_intd(io, shadow->range);
+  }
+
+  if (fabs(shadow->filter)>LIB3DS_EPSILON) { /*---- LIB3DS_SHADOW_FILTER ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_SHADOW_FILTER;
+    c.size=10;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_float(io, shadow->filter);
+  }
+  if (fabs(shadow->ray_bias)>LIB3DS_EPSILON) { /*---- LIB3DS_RAY_BIAS ----*/
+    Lib3dsChunk c;
+    c.chunk=LIB3DS_RAY_BIAS;
+    c.size=10;
+    lib3ds_chunk_write(&c,io);
+    lib3ds_io_write_float(io, shadow->ray_bias);
+  }
+  return(LIB3DS_TRUE);
+}
+
+
+/*!
+
+\typedef Lib3dsShadow
+  \ingroup shadow
+  \sa _Lib3dsShadow
+
+*/