entity *collision_test_weapon_with_any_target (entity *weapon, vec3d *weapon_old_position, vec3d *weapon_new_position)
{
entity
*launcher,
*collision_entity;
vec3d
weapon_intercept_point,
face_normal;
ASSERT (weapon);
ASSERT (weapon_old_position);
ASSERT (weapon_new_position);
ASSERT (get_comms_model () == COMMS_MODEL_SERVER);
launcher = get_local_entity_parent (weapon, LIST_TYPE_LAUNCHED_WEAPON);
collision_entity = get_line_of_sight_collision_entity (launcher, NULL, weapon_old_position, weapon_new_position, &weapon_intercept_point, &face_normal);
if (collision_entity)
{
*weapon_new_position = weapon_intercept_point;
}
return (collision_entity);
}
int check_position_line_of_sight (entity *source, entity *target, vec3d *source_position, vec3d *target_position, mobile_los_check_criteria criteria)
{
entity
*collision_en;
vec3d
increment,
collision_point,
normal,
#if LINE_DEBUG_MODULE
old_position,
#endif
check_position,
direction;
float
target_range,
collision_distance,
number_of_terrain_checks,
terrain_elevation;
terrain_3d_point_data
terrain_info;
ASSERT (source);
ASSERT (target);
ASSERT (source_position);
ASSERT (target_position);
direction.x = target_position->x - source_position->x;
direction.y = target_position->y - source_position->y;
direction.z = target_position->z - source_position->z;
target_range = sqrt ((direction.x * direction.x) + (direction.z * direction.z));
normalise_3d_vector (&direction);
////////////////////////////////////////////////////////////////
// COARSE line of sight check with terrain
////////////////////////////////////////////////////////////////
if (criteria & MOBILE_LOS_CHECK_COURSE_TERRAIN)
{
number_of_terrain_checks = target_range / LOS_COARSE_CHECK_DISTANCE;
increment.x = direction.x * LOS_COARSE_CHECK_DISTANCE;
increment.y = direction.y * LOS_COARSE_CHECK_DISTANCE;
increment.z = direction.z * LOS_COARSE_CHECK_DISTANCE;
check_position = *source_position;
memset (&terrain_info, 0, sizeof (terrain_3d_point_data));
while (number_of_terrain_checks > 1.0)
{
#if LINE_DEBUG_MODULE
old_position = check_position;
#endif
check_position.x += increment.x;
check_position.y += increment.y;
check_position.z += increment.z;
get_3d_terrain_point_data (check_position.x, check_position.z, &terrain_info);
terrain_elevation = get_3d_terrain_point_data_elevation (&terrain_info);
if (terrain_elevation > check_position.y)
{
#if TEXT_DEBUG_MODULE
debug_log ("MB_TGT: (%s -> %s) failed COURSE terrain LOS", get_local_entity_string (source, STRING_TYPE_FULL_NAME), get_local_entity_string (target, STRING_TYPE_FULL_NAME));
#endif
return FALSE;
}
#if LINE_DEBUG_MODULE
create_debug_3d_line (&old_position, &check_position, sys_col_yellow, 10.0);
#endif
number_of_terrain_checks --;
}
}
////////////////////////////////////////////////////////////////
// SOURCE END FINE line of sight check with terrain
////////////////////////////////////////////////////////////////
if (criteria & MOBILE_LOS_CHECK_SOURCE_END_TERRAIN)
{
number_of_terrain_checks = target_range / LOS_FINE_CHECK_DISTANCE_SOURCE_END;
number_of_terrain_checks = min (number_of_terrain_checks, LOS_NUMBER_OF_FINE_CHECKS_SOURCE_END);
increment.x = direction.x * LOS_FINE_CHECK_DISTANCE_SOURCE_END;
increment.y = direction.y * LOS_FINE_CHECK_DISTANCE_SOURCE_END;
increment.z = direction.z * LOS_FINE_CHECK_DISTANCE_SOURCE_END;
check_position = *source_position;
while (number_of_terrain_checks > 1.0)
{
#if LINE_DEBUG_MODULE
old_position = check_position;
#endif
check_position.x += increment.x;
check_position.y += increment.y;
check_position.z += increment.z;
get_3d_terrain_point_data (check_position.x, check_position.z, &terrain_info);
terrain_elevation = get_3d_terrain_point_data_elevation (&terrain_info);
if (terrain_elevation > check_position.y)
{
#if TEXT_DEBUG_MODULE
debug_log ("MB_TGT: (%s -> %s) failed FINE terrain LOS (source end)", get_local_entity_string (source, STRING_TYPE_FULL_NAME), get_local_entity_string (target, STRING_TYPE_FULL_NAME));
#endif
return FALSE;
}
#if LINE_DEBUG_MODULE
create_debug_3d_line (&old_position, &check_position, sys_col_yellow, 10.0);
#endif
number_of_terrain_checks --;
}
}
////////////////////////////////////////////////////////////////
// TARGET END FINE line of sight check with terrain
////////////////////////////////////////////////////////////////
if (criteria & MOBILE_LOS_CHECK_TARGET_END_TERRAIN)
{
number_of_terrain_checks = target_range / LOS_FINE_CHECK_DISTANCE_TARGET_END;
number_of_terrain_checks = min (number_of_terrain_checks, LOS_NUMBER_OF_FINE_CHECKS_TARGET_END);
increment.x = direction.x * LOS_FINE_CHECK_DISTANCE_TARGET_END;
increment.y = direction.y * LOS_FINE_CHECK_DISTANCE_TARGET_END;
increment.z = direction.z * LOS_FINE_CHECK_DISTANCE_TARGET_END;
check_position = *target_position;
while (number_of_terrain_checks > 1.0)
{
#if LINE_DEBUG_MODULE
old_position = check_position;
#endif
check_position.x -= increment.x;
check_position.y -= increment.y;
check_position.z -= increment.z;
get_3d_terrain_point_data (check_position.x, check_position.z, &terrain_info);
terrain_elevation = get_3d_terrain_point_data_elevation (&terrain_info);
if (terrain_elevation > check_position.y)
{
#if TEXT_DEBUG_MODULE
debug_log ("MB_TGT: (%s -> %s) failed FINE terrain LOS (target end)", get_local_entity_string (source, STRING_TYPE_FULL_NAME), get_local_entity_string (target, STRING_TYPE_FULL_NAME));
#endif
return FALSE;
}
#if LINE_DEBUG_MODULE
create_debug_3d_line (&old_position, &check_position, sys_col_yellow, 10.0);
#endif
number_of_terrain_checks --;
}
}
////////////////////////////////////////////////////////////////
// SOURCE END line of sight check with objects
////////////////////////////////////////////////////////////////
if (criteria & MOBILE_LOS_CHECK_SOURCE_END_OBJECTS)
{
check_position.x = source_position->x + (direction.x * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
check_position.y = source_position->y + (direction.y * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
check_position.z = source_position->z + (direction.z * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
collision_en = get_line_of_sight_collision_entity
(
source,
target,
source_position,
&check_position,
&collision_point,
&normal
);
if (collision_en)
{
#if TEXT_DEBUG_MODULE
debug_log ("MB_TGT: (%s -> %s) failed OBJECT LOS with %s (source end)", get_local_entity_string (source, STRING_TYPE_FULL_NAME), get_local_entity_string (target, STRING_TYPE_FULL_NAME), get_local_entity_type_name (collision_en));
#endif
return FALSE;
}
}
////////////////////////////////////////////////////////////////
// TARGET END line of sight check with objects
////////////////////////////////////////////////////////////////
if (criteria & MOBILE_LOS_CHECK_TARGET_END_OBJECTS)
{
check_position.x = target_position->x - (direction.x * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
check_position.y = target_position->y - (direction.y * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
check_position.z = target_position->z - (direction.z * LOS_OBJECT_CHECK_DISTANCE_TARGET_END);
collision_en = get_line_of_sight_collision_entity
(
source,
target,
target_position,
&check_position,
&collision_point,
&normal
);
if (collision_en)
{
collision_distance = get_sqr_3d_range (&collision_point, target_position);
if (collision_distance > (LOS_OBJECT_EXCLUDE_DISTANCE_TARGET_END * LOS_OBJECT_EXCLUDE_DISTANCE_TARGET_END))
{
#if TEXT_DEBUG_MODULE
debug_log ("MB_TGT: (%s -> %s) failed OBJECT LOS with %s (target end)", get_local_entity_string (source, STRING_TYPE_FULL_NAME), get_local_entity_string (target, STRING_TYPE_FULL_NAME), get_local_entity_type_name (collision_en));
#endif
return FALSE;
}
}
}
return TRUE;
}
