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/*********************************************************************************************
*
* raylib.vector3
*
* Vector3 Functions Definition
*
* Copyright (c) 2013 Ramon Santamaria (Ray San - raysan@raysanweb.com)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose, including commercial
* applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim that you
* wrote the original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
* as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/
#include "vector3.h"
#include <math.h>
// Add two vectors
Vector3 VectorAdd(Vector3 v1, Vector3 v2)
{
Vector3 out;
out.x = v1.x + v2.x;
out.y = v1.y + v2.y;
out.z = v1.z + v2.z;
return out;
}
// Substract two vectors
Vector3 VectorSubtract(Vector3 v1, Vector3 v2)
{
Vector3 out;
out.x = v1.x - v2.x;
out.y = v1.y - v2.y;
out.z = v1.z - v2.z;
return out;
}
// Calculate two vectors cross product
Vector3 VectorCrossProduct(Vector3 v1, Vector3 v2)
{
Vector3 cross;
cross.x = v1.y*v2.z - v1.z*v2.y;
cross.y = v1.z*v2.x - v1.x*v2.z;
cross.z = v1.x*v2.y - v1.y*v2.x;
return cross;
}
// Calculate one vector perpendicular vector
Vector3 VectorPerpendicular(Vector3 v)
{
Vector3 out;
float min = fabs(v.x);
Vector3 cardinalAxis = {1.0, 0.0, 0.0};
if (fabs(v.y) < min)
{
min = fabs(v.y);
cardinalAxis = (Vector3){0.0, 1.0, 0.0};
}
if(fabs(v.z) < min)
{
cardinalAxis = (Vector3){0.0, 0.0, 1.0};
}
out = VectorCrossProduct(v, cardinalAxis);
return out;
}
// Calculate two vectors dot product
float VectorDotProduct(Vector3 v1, Vector3 v2)
{
float dot;
dot = v1.x*v2.x + v1.y*v2.y + v1.z*v2.z;
return dot;
}
// Calculate vector lenght
float VectorLength(const Vector3 v)
{
float length;
length = sqrt(v.x*v.x + v.y*v.y + v.z*v.z);
return length;
}
// Scale provided vector
void VectorScale(Vector3 *v, float scale)
{
v->x *= scale;
v->y *= scale;
v->z *= scale;
}
// Invert provided vector (direction)
void VectorInverse(Vector3 *v)
{
v->x = -v->x;
v->y = -v->y;
v->z = -v->z;
}
// Normalize provided vector
void VectorNormalize(Vector3 *v)
{
float length, ilength;
length = VectorLength(*v);
if (length == 0) length = 1;
ilength = 1.0/length;
v->x *= ilength;
v->y *= ilength;
v->z *= ilength;
}
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