Fixed indentation, tidied up the code so the if... statement is flipped around, and added <float.h> to c3d/maths.h.

include/c3d/maths.h

@@ -2,6 +2,7 @@
 #include "types.h"
 #include <string.h>
 #include <math.h>
+#include <float.h>
 
 // See http://tauday.com/tau-manifesto
 //#define M_TAU 6.28318530717958647693

source/maths/mtx_inverse.c

@@ -34,7 +34,8 @@ bool Mtx_Inverse(C3D_Mtx* out)
 	         out->m[12]  * out->m[6]  * out->m[9];
 
 	det = out->m[0] * inv[0] + out->m[1] * inv[4] + out->m[2] * inv[8] + out->m[3] * inv[12];
-	if (det != 0.0f){
+	if (fabsf(det) < FLT_EPSILON)
+		return false;
 	
 	inv[1] = -out->m[1]  * out->m[10] * out->m[15] + 
 	         out->m[1]   * out->m[11] * out->m[14] + 
@@ -121,13 +122,7 @@ bool Mtx_Inverse(C3D_Mtx* out)
 	         out->m[8] * out->m[2] * out->m[5];
 
 	det = 1.0 / det;
-
 	for (i = 0; i < 16; i++)
 		out->m[i] = inv[i] * det;
-
 	return true;
 }
-	
-	return false;
-	
-}