/*based on Copyright (C) 1995 Stephen Chenney ([email protected])*/ SFRotation camera_get_orientation(SFVec3f pos, SFVec3f target, SFVec3f up) { SFVec3f dir, tmp, v, axis, new_y; SFVec4f norm, inv_norm, y_quat, ny_quat, rot_y, rot; gf_vec_diff(dir, target, pos); gf_vec_norm(&dir); tmp = gf_vec_scale(dir, gf_vec_dot(up, dir)); gf_vec_diff(v, up, tmp); gf_vec_norm(&v); axis.x = dir.y; axis.y = -dir.x; axis.z = 0; if (gf_vec_dot(axis, axis) < FIX_EPSILON) { if (dir.z> 0) { norm.x = 0; norm.y = FIX_ONE; norm.z = 0; norm.q = 0; } else { norm.x = 0; norm.y = 0; norm.z = 0; norm.q = FIX_ONE; } } else { gf_vec_norm(&axis); norm = gf_quat_from_axis_cos(axis, -dir.z); } /* Find the inverse rotation. */ inv_norm.x = -norm.x; inv_norm.y = -norm.y; inv_norm.z = -norm.z; inv_norm.q = norm.q; /* Rotate the y. */ y_quat.x = y_quat.z = y_quat.q = 0; y_quat.y = FIX_ONE; ny_quat = gf_quat_multiply(&norm, &y_quat); ny_quat = gf_quat_multiply(&ny_quat, &inv_norm); new_y.x = ny_quat.x; new_y.y = ny_quat.y; new_y.z = ny_quat.z; tmp = gf_vec_cross(new_y, v); if (gf_vec_dot(tmp, tmp) < FIX_EPSILON) { /* The old and new may be pointing in the same or opposite. Need ** to generate a vector perpendicular to the old or new y. */ tmp.x = 0; tmp.y = -v.z; tmp.z = v.y; if (gf_vec_dot(tmp, tmp) < FIX_EPSILON) { tmp.x = v.z; tmp.y = 0; tmp.z = -v.x; } } gf_vec_norm(&tmp); rot_y = gf_quat_from_axis_cos(tmp, gf_vec_dot(new_y, v)); /* rot_y holds the rotation about the initial camera direction needed ** to align the up vectors in the final position. */ /* Put the 2 rotations together. */ rot = gf_quat_multiply(&rot_y, &norm); return gf_quat_to_rotation(&rot); }
static Bool OnSphereSensor(GF_SensorHandler *sh, Bool is_over, Bool is_cancel, GF_Event *ev, GF_Compositor *compositor)
{
Bool is_mouse = (ev->type<=GF_EVENT_MOUSEWHEEL) ? 1 : 0;
M_SphereSensor *sphere = (M_SphereSensor *)sh->sensor;
SphereSensorStack *st = (SphereSensorStack *) gf_node_get_private(sh->sensor);
if (sphere->isActive && (!sphere->enabled
|| /*mouse*/((ev->type==GF_EVENT_MOUSEUP) && (ev->mouse.button==GF_MOUSE_LEFT))
|| /*keyboar*/(!is_mouse && (!is_over|| ((ev->type==GF_EVENT_KEYDOWN) && (ev->key.key_code==GF_KEY_ENTER))))
) ) {
if (sphere->autoOffset) {
sphere->offset = sphere->rotation_changed;
if (!is_cancel) gf_node_event_out(sh->sensor, 2/*"offset"*/);
}
sphere->isActive = 0;
if (!is_cancel) gf_node_event_out(sh->sensor, 3/*"isActive"*/);
sh->grabbed = 0;
return is_cancel ? 0 : 1;
}
else if (is_mouse) {
if (!sphere->isActive && (ev->type==GF_EVENT_MOUSEDOWN) && (ev->mouse.button==GF_MOUSE_LEFT)) {
st->center.x = st->center.y = st->center.z = 0;
gf_mx_apply_vec(&compositor->hit_local_to_world, &st->center);
st->radius = gf_vec_len(compositor->hit_local_point);
if (!st->radius) st->radius = FIX_ONE;
st->grab_vec = gf_vec_scale(compositor->hit_local_point, gf_invfix(st->radius));
sphere->isActive = 1;
gf_node_event_out(sh->sensor, 3/*"isActive"*/);
sh->grabbed = 1;
return 1;
}
else if (sphere->isActive) {
SFVec3f vec, axis;
SFVec4f q1, q2;
SFRotation r;
Fixed cl;
if (is_over) {
sphere->trackPoint_changed = compositor->hit_local_point;
gf_node_event_out(sh->sensor, 5/*"trackPoint_changed"*/);
} else {
GF_Ray r;
r = compositor->hit_world_ray;
gf_mx_apply_ray(&compositor->hit_world_to_local, &r);
if (!gf_ray_hit_sphere(&r, NULL, st->radius, &compositor->hit_local_point)) {
vec.x = vec.y = vec.z = 0;
/*doesn't work properly...*/
compositor->hit_local_point = gf_closest_point_to_line(r.orig, r.dir, vec);
}
}
vec = gf_vec_scale(compositor->hit_local_point, gf_invfix(st->radius));
axis = gf_vec_cross(st->grab_vec, vec);
cl = gf_vec_len(axis);
if (cl < -FIX_ONE) cl = -FIX_ONE;
else if (cl > FIX_ONE) cl = FIX_ONE;
r.q = gf_asin(cl);
if (gf_vec_dot(st->grab_vec, vec) < 0) r.q += GF_PI / 2;
gf_vec_norm(&axis);
r.x = axis.x;
r.y = axis.y;
r.z = axis.z;
q1 = gf_quat_from_rotation(r);
if (sphere->autoOffset) {
q2 = gf_quat_from_rotation(sphere->offset);
q1 = gf_quat_multiply(&q1, &q2);
}
sphere->rotation_changed = gf_quat_to_rotation(&q1);
gf_node_event_out(sh->sensor, 4/*"rotation_changed"*/);
return 1;
}
} else {
if (!sphere->isActive && is_over && (ev->type==GF_EVENT_KEYDOWN) && (ev->key.key_code==GF_KEY_ENTER)) {
sphere->isActive = 1;
sphere->rotation_changed = sphere->offset;
gf_node_event_out(sh->sensor, 3/*"isActive"*/);
return 1;
}
else if (sphere->isActive && (ev->type==GF_EVENT_KEYDOWN)) {
SFVec4f res, rot;
Fixed diff = GF_PI/64;
res = sphere->rotation_changed;
switch (ev->key.key_code) {
case GF_KEY_LEFT:
diff = -diff;
case GF_KEY_RIGHT:
rot.x = 0;
rot.y = FIX_ONE;
rot.z = 0;
rot.q = diff;
res = gf_quat_from_rotation(res);
rot = gf_quat_from_rotation(rot);
rot = gf_quat_multiply(&rot, &res);
res = gf_quat_to_rotation(&rot);
break;
case GF_KEY_DOWN:
diff = -diff;
case GF_KEY_UP:
if (ev->key.flags & GF_KEY_MOD_SHIFT) {
rot.x = 0;
rot.z = FIX_ONE;
} else {
rot.x = FIX_ONE;
rot.z = 0;
}
rot.y = 0;
rot.q = diff;
res = gf_quat_from_rotation(res);
rot = gf_quat_from_rotation(rot);
rot = gf_quat_multiply(&rot, &res);
res = gf_quat_to_rotation(&rot);
break;
case GF_KEY_HOME:
res = sphere->offset;
break;
default:
return 0;
}
sphere->rotation_changed = res;
gf_node_event_out(sh->sensor, 4/*"rotation_changed"*/);
return 1;
}
}
return 0;
}
static void OnSphereSensor(SensorHandler *sh, Bool is_over, GF_Event *ev, RayHitInfo *hit_info)
{
M_SphereSensor *sphere = (M_SphereSensor *)sh->owner;
SphereSensorStack *st = (SphereSensorStack *) gf_node_get_private(sh->owner);
if (sphere->isActive && (!sphere->enabled || ((ev->type==GF_EVENT_MOUSEUP) && (ev->mouse.button==GF_MOUSE_LEFT)) ) ) {
if (sphere->autoOffset) {
sphere->offset = sphere->rotation_changed;
gf_node_event_out_str(sh->owner, "offset");
}
sphere->isActive = 0;
gf_node_event_out_str(sh->owner, "isActive");
R3D_SetGrabbed(st->compositor, 0);
}
else if (!sphere->isActive && (ev->type==GF_EVENT_MOUSEDOWN) && (ev->mouse.button==GF_MOUSE_LEFT)) {
st->center.x = st->center.y = st->center.z = 0;
gf_mx_apply_vec(&hit_info->local_to_world, &st->center);
st->radius = gf_vec_len(hit_info->local_point);
if (!st->radius) st->radius = FIX_ONE;
st->grab_vec = gf_vec_scale(hit_info->local_point, gf_invfix(st->radius));
sphere->isActive = 1;
gf_node_event_out_str(sh->owner, "isActive");
R3D_SetGrabbed(st->compositor, 1);
}
else if (sphere->isActive) {
SFVec3f vec, axis;
SFVec4f q1, q2;
SFRotation r;
Fixed cl;
if (is_over) {
sphere->trackPoint_changed = hit_info->local_point;
gf_node_event_out_str(sh->owner, "trackPoint_changed");
} else {
GF_Ray r;
r = hit_info->world_ray;
gf_mx_apply_ray(&hit_info->world_to_local, &r);
if (!gf_ray_hit_sphere(&r, NULL, st->radius, &hit_info->local_point)) {
vec.x = vec.y = vec.z = 0;
/*doesn't work properly...*/
hit_info->local_point = gf_closest_point_to_line(r.orig, r.dir, vec);
}
}
vec = gf_vec_scale(hit_info->local_point, gf_invfix(st->radius));
axis = gf_vec_cross(st->grab_vec, vec);
cl = gf_vec_len(axis);
if (cl < -FIX_ONE) cl = -FIX_ONE;
else if (cl > FIX_ONE) cl = FIX_ONE;
r.q = gf_asin(cl);
if (gf_vec_dot(st->grab_vec, vec) < 0) r.q += GF_PI / 2;
gf_vec_norm(&axis);
r.x = axis.x; r.y = axis.y; r.z = axis.z;
q1 = gf_quat_from_rotation(r);
if (sphere->autoOffset) {
q2 = gf_quat_from_rotation(sphere->offset);
q1 = gf_quat_multiply(&q1, &q2);
}
sphere->rotation_changed = gf_quat_to_rotation(&q1);
gf_node_event_out_str(sh->owner, "rotation_changed");
}
}
