--- ray/src/common/mat4.h	1990/12/15 14:18:18	1.1
+++ ray/src/common/mat4.h	1993/03/05 15:14:03	2.2
@@ -8,7 +8,7 @@
 
 #include  "fvect.h"
 
-typedef double  MAT4[4][4];
+typedef FLOAT  MAT4[4][4];
 
 #ifdef  BSD
 #define  copymat4(m4a,m4b)	bcopy((char *)m4b,(char *)m4a,sizeof(MAT4))
@@ -16,3 +16,10 @@ typedef double  MAT4[4][4];
 #define  copymat4(m4a,m4b)	(void)memcpy((char *)m4a,(char *)m4b,sizeof(MAT4))
 extern char  *memcpy();
 #endif
+
+#define  MAT4IDENT		{ {1.,0.,0.,0.}, {0.,1.,0.,0.}, \
+				{0.,0.,1.,0.}, {0.,0.,0.,1.} }
+
+extern MAT4  m4ident;
+
+#define  setident4(m4)		copymat4(m4, m4ident)