From efb40cfff1bbbd4f6ff0b0c05788dff6ad45ff02 Mon Sep 17 00:00:00 2001 From: chai Date: Thu, 16 Jul 2020 01:45:33 +0800 Subject: *mesh import --- src/math/vec3.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'src/math/vec3.c') diff --git a/src/math/vec3.c b/src/math/vec3.c index e9c12a4..43154dc 100644 --- a/src/math/vec3.c +++ b/src/math/vec3.c @@ -4,6 +4,8 @@ #include "../util/assert.h" #include "../core/mem.h" +#include "../shaders/common/mathlib.h" + Vec3 vec3forward = {0,0,1}; Vec3 vec3up = {0, 1, 0}; Vec3 vec3left = {1, 0, 0}; @@ -134,4 +136,15 @@ void internal_vec3_minus(Vec3* v1, Vec3* v2, Vec3* out) { out->x = v1->x - v2->x; out->y = v1->y - v2->y; out->z = v1->z - v2->z; +} + +// x tangent +// y bitangent +// z normal +void internal_vec3_orthogonalize(Vec3* x, Vec3* y, Vec3* z, Vec3* out_x, Vec3* out_y, Vec3* out_z) { + *out_z = *z; + *out_x = vec3_minus(*x, vec3_scale(*z, vec3_dot(*z, *x))); + Vec3 v1 = vec3_scale(*z, vec3_dot(*z, *y)); + Vec3 v2 = vec3_scale(*out_x, vec3_dot(*out_x, *y)); + *out_y = vec3_minus(*y, vec3_plus(v1, v2)); } \ No newline at end of file -- cgit v1.1-26-g67d0