/******************************************************************************\
Computes tile vectors for the parameter array.
\******************************************************************************/
static void compute_tile_vectors(int i)
{
c_vec3_t ab, ac;
/* Set tile normal vector */
ab = C_vec3_sub(r_globe_verts[3 * i].v.co,
r_globe_verts[3 * i + 1].v.co);
ac = C_vec3_sub(r_globe_verts[3 * i].v.co,
r_globe_verts[3 * i + 2].v.co);
r_tiles[i].normal = C_vec3_norm(C_vec3_cross(ab, ac));
r_globe_verts[3 * i].v.no = r_tiles[i].normal;
r_globe_verts[3 * i + 1].v.no = r_tiles[i].normal;
r_globe_verts[3 * i + 2].v.no = r_tiles[i].normal;
/* Centroid */
r_tiles[i].origin = C_vec3_add(r_globe_verts[3 * i].v.co,
r_globe_verts[3 * i + 1].v.co);
r_tiles[i].origin = C_vec3_add(r_tiles[i].origin,
r_globe_verts[3 * i + 2].v.co);
r_tiles[i].origin = C_vec3_divf(r_tiles[i].origin, 3.f);
/* Forward vector */
r_tiles[i].forward = C_vec3_sub(r_globe_verts[3 * i].v.co,
r_tiles[i].origin);
r_tiles[i].forward = C_vec3_norm(r_tiles[i].forward);
}
/******************************************************************************\
Begin a gradual rotation to the target normal.
\******************************************************************************/
void R_rotate_cam_to(c_vec3_t pos)
{
c_vec3_t norm_origin;
if (!pos.x && !pos.y && !pos.z)
return;
norm_origin = C_vec3_norm(r_cam_origin);
pos = C_vec3_norm(pos);
gradual_axis = C_vec3_norm(C_vec3_cross(pos, norm_origin));
gradual_angle = acosf(C_vec3_dot(pos, norm_origin));
if (gradual_angle < 0.f) {
gradual_angle = -gradual_angle;
gradual_axis = C_vec3_scalef(gradual_axis, -1.f);
}
R_grab_cam();
cam_gradual = TRUE;
}