--- ray/src/common/mat4.c	1990/12/15 15:01:38	1.5
+++ ray/src/common/mat4.c	1991/11/12 16:54:53	2.1
@@ -12,22 +12,11 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  "mat4.h"
 
+MAT4  m4ident = MAT4IDENT;
+
 static MAT4  m4tmp;		/* for efficiency */
 
 
-setident4(m4)
-MAT4  m4;
-{
-	static MAT4  ident = {
-		1.,0.,0.,0.,
-		0.,1.,0.,0.,
-		0.,0.,1.,0.,
-		0.,0.,0.,1.,
-	};
-	copymat4(m4, ident);
-}
-
-
 multmat4(m4a, m4b, m4c)		/* multiply m4b X m4c and put into m4a */
 MAT4  m4a;
 register MAT4  m4b, m4c;
@@ -72,7 +61,6 @@ register MAT4  m4;
 }
 
 
-#ifdef  INVMAT
 /*
  * invmat - computes the inverse of mat into inverse.  Returns 1
  * if there exists an inverse, 0 otherwise.  It uses Gaussian Elimination
@@ -89,7 +77,7 @@ MAT4  mat, inverse;
 	register double temp;
 
 	copymat4(m4tmp, mat);
-	setident(inverse);
+	setident4(inverse);
 
 	for(i = 0; i < 4; i++) {
 		/* Look for row with largest pivot and swap rows */
@@ -127,4 +115,3 @@ MAT4  mat, inverse;
 #undef ABS
 #undef SWAP
 }
-#endif