ccore/src/Plane.c

#include "core/Plane.h"

#include <stdio.h>

#define CV30 (&CORE_VECTOR3)

CorePlane* coreInitPlane(CorePlane* p, const CoreVector3* a,
                         const CoreVector3* b, const CoreVector3* c) {
    coreCross(&p->abc, coreSubV3(CV30, b, a), coreSubV3(CV30, c, a));
    coreNormalizeV3(&p->abc);
    p->d = -coreDotV3(&p->abc, b);
    return p;
}

float coreSignedDistance(const CorePlane* p, const CoreVector3* v) {
    return coreDotV3(&p->abc, v) + p->d;
}

size_t coreToStringPlane(const CorePlane* p, char* buffer, size_t n) {
    int w = snprintf(buffer, n, "(%.3f x + %.3f y + %.3f z + %.3f)",
                     (double)p->abc.data[0], (double)p->abc.data[1],
                     (double)p->abc.data[2], (double)p->d);
    return w < 0 ? 0 : (size_t)w;
}