Original Source for 1.13 Mod High Resolution version from 12/06/05

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@21 3b4a5df2-a311-0410-b5c6-a8a6f20db521

TileEngine/phys math.cpp

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+#ifdef PRECOMPILEDHEADERS
+	#include "TileEngine All.h"
+#else
+	#include "phys math.h"
+	#include <memory.h>
+#endif
+
+vector_3	VSetEqual( vector_3 *a )
+{
+	vector_3 c;
+
+//	c.x = a->x;
+//	c.y = a->y;
+//	c.z = a->z;
+	memcpy( &c, a, sizeof( vector_3 ) );
+
+	return( c );
+}
+
+vector_3 VSubtract( vector_3 *a, vector_3 *b )
+{
+	vector_3 c;
+
+	c.x = a->x - b->x;
+	c.y = a->y - b->y;
+	c.z = a->z - b->z;
+		
+	return( c );
+}
+
+vector_3 VAdd( vector_3 *a, vector_3 *b )
+{
+	vector_3 c;
+
+	c.x = a->x + b->x;
+	c.y = a->y + b->y;
+	c.z = a->z + b->z;
+		
+	return( c );
+}
+
+vector_3 VMultScalar( vector_3 *a, real b )
+{
+	vector_3 c;
+
+	c.x = a->x * b;
+	c.y = a->y * b;
+	c.z = a->z * b;
+		
+	return( c );
+}
+
+vector_3 VDivScalar( vector_3 *a, real b )
+{
+	vector_3 c;
+
+	c.x = a->x / b;
+	c.y = a->y / b;
+	c.z = a->z / b;
+		
+	return( c );
+}
+
+real VDotProduct( vector_3 *a, vector_3 *b )
+{
+	return ( ( a->x * b->x ) + ( a->y * b->y ) + ( a->z * b->z ) );
+}
+
+real VPerpDotProduct( vector_3 *a, vector_3 *b )
+{
+	return ( ( a->x * b->x ) - ( a->y * b->y ) - ( a->z * b->z ) );
+}
+
+
+vector_3 VCrossProduct( vector_3 *a, vector_3 *b )
+{
+	vector_3 c;
+
+	c.x = ( a->y * b->z ) - ( a->z *  b->y );
+	c.y = ( a->x * b->z ) - ( a->z *  b->x );
+	c.z = ( a->x * b->y ) - ( a->y *  b->x );
+
+	return( c );
+}
+
+
+vector_3 VGetPerpendicular( vector_3 *a )
+{
+	vector_3 c;
+
+	c.x = -a->y;
+	c.y =  a->x;
+	c.z =  a->z;
+
+	return( c );
+}
+
+real VGetLength( vector_3 *a )
+{
+	return( (real) sqrt( ( a->x * a->x ) + ( a->y * a->y ) + ( a->z * a->z ) ) );
+}
+
+
+vector_3 VGetNormal( vector_3 *a )
+{
+	vector_3	c;
+	real OneOverLength, Length;
+
+	Length = VGetLength( a );
+
+	if ( Length == 0 )	
+	{
+		c.x = 0;
+		c.y = 0;
+		c.z = 0;
+	}
+	else
+	{
+		OneOverLength = 1/Length;
+
+		c.x = OneOverLength * a->x;
+		c.y = OneOverLength * a->y;
+		c.z = OneOverLength * a->z;
+	}
+	return ( c );
+}
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