stephenseo/3d_collision_helpers
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Tweak to representation of box coordinates

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Previous implementation assumed coords was a corner of the box. This
changes the representation for the coords to denote the center of the
box.
This commit is contained in:
Stephen Seo 2024-04-26 13:13:59 +09:00
parent 4a1c5530a5
commit 3664e1734b
2 changed files with 18 additions and 3 deletions
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19
src/sd_sacd.cpp
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@ -5,9 +5,22 @@
int SC_SACD_AABB_Box_Collision(const SC_SACD_AABB_Box *a,
const SC_SACD_AABB_Box *b) {
return (a->x < (b->x + b->width) && (a->x + a->width) > b->x &&
a->y < (b->y + b->height) && (a->y + a->height) > b->y &&
a->z < (b->z + b->depth) && (a->z + a->depth) > b->z)
float ax_min = a->x - a->width / 2.0F;
float ax_max = a->x + a->width / 2.0F;
float ay_min = a->y - a->height / 2.0F;
float ay_max = a->y + a->height / 2.0F;
float az_min = a->z - a->depth / 2.0F;
float az_max = a->z + a->depth / 2.0F;
float bx_min = b->x - b->width / 2.0F;
float bx_max = b->x + b->width / 2.0F;
float by_min = b->y - b->height / 2.0F;
float by_max = b->y + b->height / 2.0F;
float bz_min = b->z - b->depth / 2.0F;
float bz_max = b->z + b->depth / 2.0F;
return (ax_min < bx_max && ax_max > bx_min && ay_min < by_max &&
ay_max > by_min && az_min < bz_max && az_max > bz_min)
? 1
: 0;
}

2
src/sd_sacd.h
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@ -31,6 +31,7 @@ typedef struct SC_SACD_EXPORT SC_SACD_Mat3 {
} SC_SACD_Mat3;
typedef struct SC_SACD_EXPORT SC_SACD_AABB_Box {
/// Coordinates are to center of box.
float x;
float y;
float z;
@ -43,6 +44,7 @@ typedef struct SC_SACD_EXPORT SC_SACD_AABB_Box {
} SC_SACD_AABB_Box;
typedef struct SC_SACD_EXPORT SC_SACD_Generic_Box {
/// Coordinates are to center of box.
float x;
float y;
float z;