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Vector multiplication of vectors

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parent
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4b4b31d574
  1. 15
      src/math/vector.c
  2. 8
      src/math/vector.h

15
src/math/vector.c

@ -11,7 +11,6 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
*/
#include "vector.h"
#include <math.h>
// Calculate vector's length
long double vec2_len(vec2 vec) {
@ -99,4 +98,18 @@ long double vec3_angle(vec3 a, vec3 b) {
// Get cosinus of angle between 2 given vectors
long double vec3f_angle(vec3f a, vec3f b) {
return vec3f_multiply_scalar(a, b) / (vec3f_len(a) * vec3f_len(b));
}
// | i j k |
// | a.x a.y a.z |
// | b.x b.y b.z |
// Get resulting vector of vector multiplication of 2 given vectors
vec3 vec3_multiply_vector(vec3 a, vec3 b) {
return (vec3){a.y*b.z-(b.y*a.z), -(a.x*b.z-(b.x*a.z)), a.x*b.y-(b.x*a.y)};
}
// Get resulting vector of vector multiplication of 2 given vectors
vec3f vec3f_multiply_vector(vec3f a, vec3f b) {
return (vec3f){a.y*b.z-(b.y*a.z), -(a.x*b.z-(b.x*a.z)), a.x*b.y-(b.x*a.y)};
}

8
src/math/vector.h

@ -80,4 +80,10 @@ long double vec3f_multiply_scalar(vec3f a, vec3f b);
long double vec3_angle(vec3 a, vec3 b);
// Get cosinus of angle between 2 given vectors
long double vec3f_angle(vec3f a, vec3f b);
long double vec3f_angle(vec3f a, vec3f b);
// Get resulting vector of vector multiplication of 2 given vectors
vec3 vec3_multiply_vector(vec3 a, vec3 b);
// Get resulting vector of vector multiplication of 2 given vectors
vec3f vec3f_multiply_vector(vec3f a, vec3f b);
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