diff --git a/include/ak/core-types.h b/include/ak/core-types.h
index 199509cd..25d14c1f 100644
--- a/include/ak/core-types.h
+++ b/include/ak/core-types.h
@@ -20,6 +20,8 @@
 typedef const char           *AkString;
 typedef char                 *AkMutString;
 typedef bool                  AkBool;
+typedef int16_t               AkInt16;
+typedef uint16_t              AkUInt16;
 typedef int32_t               AkInt;
 typedef uint32_t              AkUInt;
 typedef int64_t               AkInt64;
diff --git a/include/ak/type.h b/include/ak/type.h
index 6c64a928..e7154f69 100644
--- a/include/ak/type.h
+++ b/include/ak/type.h
@@ -61,6 +61,7 @@ typedef enum AkTypeId {
   AKT_UBYTE         = 30,
   AKT_SHORT         = 31,
   AKT_USHORT        = 32,
+  AKT_DOUBLE        = 33,
 
   AKT_EFFECT,
   AKT_PROFILE,
diff --git a/src/default/type.c b/src/default/type.c
index 719b086f..dcae17eb 100644
--- a/src/default/type.c
+++ b/src/default/type.c
@@ -47,7 +47,21 @@ AkTypeDesc ak_def_type_descs[] = {
 
   {"sampler2D", AKT_SAMPLER2D, sizeof(AkSampler),          0},
 
-  {NULL,       0,            0,                            0}
+  /* for PLY  */
+  {"char",      AKT_BYTE,      sizeof(char),               0},
+  {"uchar",     AKT_UBYTE,     sizeof(char),               0},
+  {"double",    AKT_DOUBLE,    sizeof(AkDouble),           0},
+  
+  {"int8",      AKT_INT,       sizeof(char),               0},
+  {"uint8",     AKT_UINT,      sizeof(char),               0},
+  {"int16",     AKT_SHORT,     sizeof(AkInt16),            0},
+  {"uint16",    AKT_USHORT,    sizeof(AkUInt16),           0},
+  {"int32",     AKT_UINT,      sizeof(AkInt),              0},
+  {"uint32",    AKT_UINT,      sizeof(AkUInt),             0},
+  {"float32",   AKT_FLOAT,     sizeof(AkFloat),            0},
+  {"float64",   AKT_DOUBLE,    sizeof(AkDouble),           0},
+
+  {NULL,        0,             0,                          0}
 };
 
 const AkTypeDesc*