crown-engine/docs/lua_api.txt

.. contents::

Math
====

Vector3
-------

	**Vector3** (x, y, z) : Vector3
		Constructor.

	**x** (v) : float
		Returns the x value of the vector.

	**y** (v) : float
		Returns the y value of the vector.

	**z** (v) : float
		Returns the z value of the vector.

	**.x** : float
		Returns/assigns the x value of the vector.

	**.y** : float
		Returns/assigns the y value of the vector.

	**.z** : float
		Returns/assigns the z value of the vector.

	**set_x** (v, x)
		Sets the value of the x value of the vector.

	**set_y** (v, y)
		Sets the value of the y value of the vector.

	**set_z** (v, z)
		Sets the value of the z value of the vector.

	**values** (v) : float, float, float
		Returns the x, y and z values of the vector.

	**add** (a, b) : Vector3
		Adds the vector *a* to *b* and returns the result.

	**subtract** (a, b) : Vector3
		Subtracts the vector *b* from *a* and returns the result.

	**multiply** (a, k) : Vector3
		Multiplies the vector *a* by the scalar *k* and returns the result.

	**divide** (a, k) : Vector3
		Divides the vector *a* by the scalar *k* and returns the result.

	**dot** (a, b) : float
		Returns the dot product between the vectors *a* and *b*.

	**cross** (a, b) : Vector3
		Returns the cross product between the vectors *a* and *b*.

	**equal** (a, b) : bool
		Returns true whether the vectors *a* and *b* are equal.

	**length** (a) : float
		Returns the lenght of *a*.

	**squared_length** (a) : float
		Returns the squared length of *a*.

	**set_length** (a, len)
		Sets the lenght of *a* to *len*.

	**normalize** (a) : Vector3
		Normalizes *a* and returns the result.

	**distance** (a, b) : float
		Returns the distance between the points *a* and *b*.

	**angle** (a, b) : float
		Returns the angle between the vectors *a* and *b*.

	**forward** () : Vector3

	**backward** () : Vector3

	**left** () : Vector3

	**right** () : Vector3

	**up** () : Vector3

	**down** () : Vector3

		Returns the corresponding semantic axis.

Vector3Box
----------

	**Vector3Box** ()
		Creates a new Vector3Box.

	**Vector3Box** (v)
		Creates a new Vector3Box from the Vector3 *v*.

	**Vector3Box** (x, y, z)
		Creates a new Vector3Box from components.

	**store** (v)
		Stores the Vector3 *v* in the box.

	**store** (x, y, z)
		Stores Vector3(x, y, z) in the box.

	**unbox** () : Vector3
		Returns the stored vector from the box.

Quaternion
----------

	**Quaternion** (v, w) : Quaternion
		Constructor.

	**negate** (q) : Quaternion
		Negates the quaternion *q* and returns the result.

	**identity** () : Quaternion
		Returns the identity quaternion.

	**multiply** (a, b) : Quaternion
		Multiplies the quaternions *a* and *b*. (i.e. rotates first by *a* then by *b*).

	**multiply_by_scalar** (a, k) : Quaternion
		Multiplies the quaternion *a* by the scalar *k*.

	**length** (q) : float
		Returns the length of *q*.

	**normalize** (q) : Quaternion
		Normalizes the quaternion *q* and returns the result.

	**conjugate** (q) : Quaternion
		Returns the conjugate of quaternion *q*.

	**inverse** (q) : Quaternion
		Returns the inverse of quaternion *q*.

	**power** (q, exp) : Quaternion
		Returns the quaternion *q* raised to the power of *exp*.

	**elements** (q) : x, y, z, w
		Returns the elements of the quaternion.

QuaternionBox
-------------

	**QuaternionBox** ()
		Creates a new QuaternionBox.

	**QuaternionBox** (q)
		Creates a new QuaternionBox from the Quaternion *q*.

	**QuaternionBox** (x, y, z, w)
		Creates a new QuaternionBox from elements.

	**store(q)** ()
		Stores the Quaternion *q* in the box.

	**store** (x, y, z, w)
		Stores Quaternion(x, y, z, w) in the box.

	**unbox** () : Quaternion
		Returns the stored quaternion from the box.

Matrix4x4
---------

	**Matrix4x4** (m0, m1, ..., m15) : Matrix4x4
		Constructor.

	**from_quaternion** (q) : Matrix4x4
		Returns a new matrix from *q*.

	**from_translation** (t) : Matrix4x4
		Returns a new matrix from *t*.

	**from_quaternion_translation** (q, t) : Matrix4x4
		Returns a new matrix from *q* and *t*.

	**from_axes** (x, y, z, t) : Matrix4x4
		Returns a new matrix from *x*, *y*, *z* and *t*.

	**add** (a, b) : Matrix4x4
		Adds the matrix *a* to *b* and returns the result.

	**subtract** (a, b) : Matrix4x4
		Subtracts the matrix *b* from *a* and returns the result.

	**multiply** (a, b) : Matrix4x4
		Multiplies the matrix *a* by *b* and returns the result. (i.e. transforms first by *a* then by *b*)

	**transpose** (m) : Matrix4x4
		Transposes the matrix *m* and returns the result.

	**determinant** (m) : float
		Returns the determinant of the matrix *m*.

	**invert** (m) : Matrix4x4
		Inverts the matrix *m* and returns the result.

	**x** (m) : Vector3
		Returns the x asis of the matrix *m*.

	**y** (m) : Vector3
		Returns the y asis of the matrix *m*.

	**z** (m) : Vector3
		Returns the z asis of the matrix *m*.

	**set_x** (m, x)
		Sets the x axis of the matrix *m*.

	**set_y** (m, y)
		Sets the y axis of the matrix *m*.

	**set_z** (m, z)
		Sets the z axis of the matrix *m*.

	**translation** (m, a) : Vector3
		Returns the translation portion of the matrix *m*.

	**set_translation** (m, t)
		Sets the translation portion of the matrix *m*.

	**identity** ()
		Returns the identity matrix.

	**to_string** (a)
		Returns a string representing the matrix.

Matrix4x4Box
------------

	**Matrix4x4Box** (m)
		Creates a new Matrix4x4Box from the Matrix4x4 *m*.

	**store** (m)
		Stores the Matrix4x4 *m* in the box.

	**unbox** () : Matrix4x4
		Returns the stored matrix from the box.

Math
----

	**ray_obb_intersection** (from, dir, tm, extents) : float
		Returns the distance along ray (from, dir) to intersection point with the oriented
		bounding box (tm, extents) or -1.0 if no intersection.

World
=====

	**spawn_unit** (world, name, [position, rotation]) : Unit
		Spawns a new instance of the unit *name* at the given *position* and *rotation*.

	**destroy_unit** (world, unit)
		Destroys the given *unit*.

	**num_units** (world) : int
		Returns the number of units in the *world*.

	**units** (world) : Table
		Returns all the the units in the world in a table.

	**update_animations** (world, dt)
		Update all animations with *dt*.

	**update_scene** (world, dt)
		Updates the scene with *dt*.

	**update** (world, dt)
		Updates the world with *dt*.

	**play_sound** (world, name, [loop, volume, position, range]) : SoundInstanceId
		Plays the sound with the given *name* at the given *position*, with the given
		*volume* and *range*. *loop* controls whether the sound must loop or not.

	**stop_sound** (world, id)
		Stops the sound with the given *id*.

	**link_sound** (world, id, unit, node)
		Links the sound *id* to the *node* of the given *unit*.
		After this call, the sound *id* will follow the unit *unit*.

	**set_listener_pose** (world, pose)
		Sets the *pose* of the listener.

	**set_sound_position** (world, position)
		Sets the *position* of the sound *id*.

	**set_sound_range** (world, range)
		Sets the *range* of the sound *id*.

	**set_sound_volume** (world, volume)
		Sets the *volume* of the sound *id*.

	**create_window_gui** (world) : Gui
		Creates a new window-space Gui of size *width* and *height*.

	**destroy_gui** (world, id)
		Destroys the gui with the given *id*.

	**create_debug_line** (world, depth_test) : DebugLine
		Creates a new DebugLine. *depth_test* controls whether to
		enable depth test when rendering the lines.

	**destroy_debug_line** (world, line)
		Destroys the debug *line*.

	**load_level** (world, name) : Level
		Loads the level *name* into the world.

	**physics_world** (world) : PhysicsWorld
		Returns the physics sub-world.

	**sound_world** (world) : SoundWorld
		Returns the sound sub-world.

Unit
----

	**local_position** (unit) : Vector3
		Returns the local position of the unit.

	**local_rotation** (unit) : Quaternion
		Returns the local rotation of the unit.

	**local_scale** (unit) : Vector3
		Returns the local scale of the unit.

	**local_pose** (unit) : Matrix4x4
		Returns the local pose of the unit.

	**world_position** (unit) : Vector3
		Returns the world position of the unit.

	**world_rotation** (unit) : Quaternion
		Returns the world rotation of the unit.

	**world_pose** (unit) : Matrix4x4
		Returns the world pose of the unit.

	**set_local_position** (unit, position)
		Sets the local position of the unit.

	**set_local_rotation** (unit, rotation)
		Sets the local rotation of the unit.

	**set_local_scale** (unit, scale)
		Sets the local scale of the unit.

	**set_local_pose** (unit, n, pose)
		Sets the local pose of the unit.

	**camera** (unit, name)
		Returns the camera *name*.

	**material** (unit, name)
		Returns the material *name*.

	**mesh** (unit, name)
		Returns the mesh *name*.

	**sprite** (unit, name)
		Returns the sprite *name*.

	**actor** (unit, name)
		Returns the actor *name*.

	**controller** (unit, name)
		Returns the controller *name*.

	**is_a** (unit, type)
		Returns whether the unit is of the given *type*.

	**play_sprite_animation** (unit, name, loop)
		Plays the sprite animation *name*.

	**stop_sprite_animation** (unit)
		Stops the current playing animation.

Camera
------

	**set_projection_type** (camera, type)
		Sets the projection type of the camera.

	**projection_type** (camera) : int
		Returns the projection type of the camera.

	**fov** (camera) : float
		Returns the field-of-view of the camera in degrees.

	**set_fov** (camera, degrees)
		Sets the field-of-view of the camera in degrees.

	**aspect** (camera) : float
		Returns the aspect ratio of the camera. (Perspective projection only.)

	**set_aspect** (camera)
		Sets the aspect ratio of the camera. (Perspective projection only.)

	**near_clip_distance** (camera) : float
		Returns the near clip distance of the camera.

	**set_near_clip_distance** (camera, near)
		Sets the near clip distance of the camera.

	**far_clip_distance** (camera) : float
		Returns the far clip distance of the camera.

	**set_far_clip_distance** (camera, far)
		Sets the far clip distance of the camera.

	**set_orthographic_metrics** (camera, left, right, bottom, top)
		Sets the coordinates for orthographic clipping planes. (Orthographic projection only.)

	**set_viewport_metrics** (camera, x, y, width, height)
		Sets the coordinates for the camera viewport in pixels.

	**screen_to_world** (camera, pos) : Vector3
		Returns *pos* from screen-space to world-space coordinates.

	**world_to_screen** (camera, pos) : Vector3
		Returns *pos* from world-space to screen-space coordinates.

Sprite
------

	**set_frame** (sprite, num)
		Sets the frame of the sprite.

	**set_depth** (sprite, depth)
		Sets the depth of the sprite.
		Sprites with higher depth values are drawn in front of sprites
		whith lower depth values.

Mesh
----

	**local_position** (mesh) : Vector3
		Returns the local position of the mesh.

	**local_rotation** (mesh) : Quaternion
		Returns the local rotation of the mesh.

	**local_pose** (mesh) : Matrix4x4
		Returns the local pose of the mesh.

	**set_local_position** (mesh, unit, position)
		Sets the local position of the mesh.

	**set_local_rotation** (mesh, unit, rotation)
		Sets the local rotation of the mesh.

	**set_local_pose** (mesh, unit, pose)
		Sets the local pose of the mesh.

Material
--------

	**set_float** (material, variable, value)
		Sets the material variable to the given value.

	**set_vector2** (material, variable, value)
		Sets the material variable to the given value.

	**set_vector3** (material, variable, value)
		Sets the material variable to the given value.

Gui
---

	resolution
		TODO

	move
		TODO

	screen_to_gui
		TODO

	draw_rectangle
		TODO

	draw_image
		TODO

	draw_image_uv
		TODO

	draw_text
		TODO

PhysicsWorld
=============

	**gravity** (physics_world) : Vector3
		Returns the gravity.

	**set_gravity** (physics_world, gravity)
		Sets the gravity.

	**make_raycast**
		TODO

	**overlap_test**
		TODO

Controller
----------

	**move** (controller, position)
		Moves the controller to *position*.

	**position** (controller) : Vector3
		Returns the position of the controller.

	**collides_up** (controller) : bool
		Returns whether the contoller collides upwards.

	**collides_down** (controller) : bool
		Returns whether the controller collides downwards.

	**collides_sides** (controller) : bool
		Returns whether the controller collides sidewards.

Actor
-----

	**world_position** (actor) : Vector3
		Returns the world position of the actor.

	**world_rotation** (actor) : Quaternion
		Returns the world rotation of the actor.

	**world_pose** (actor) : Matrix4x4
		Returns the world pose of the actor.

	**teleport_world_position** (actor, position)
		Teleports the actor to the given world position.

	**teleport_world_rotation** (actor, rotation)
		Teleports the actor to the given world rotation.

	**teleport_world_pose** (actor, pose)
		Teleports the actor to the given world pose.

	**center_of_mass** (actor) : Vector3
		Returns the center of mass of the actor.

	**enable_gravity** (actor)
		Enables gravity for the actor.

	**disable_gravity** (actor)
		Disables gravity for the actor.

	**enable_collision** (actor)
		Enables collision detection for the actor.

	**disable_collision** (actor)
		Disables collision detection for the actor.

	**set_collision_filter** (actor, name)
		Sets the collision filter of the actor.

	**set_kinematic** (actor, kinematic)
		Sets whether the actor is kinematic or not.
		Note that this call has no effect on static actors.

	**move** (actor, position)
		Moves the actor to *pos*
		Note that this call only affects nonkinematic actors.

	**is_static** (actor) : bool
		Returns whether the actor is static.

	**is_dynamic** (actor) bool
		Returns whether the actor is dynamic.

	**is_kinematic** (actor) : bool
		Returns whether the actor is kinematic (keyframed).

	**is_nonkinematic** (actor) : bool
		Returns whether the actor is nonkinematic (i.e. dynamic and not kinematic).

	**linear_damping** (actor) : float
		Returns the linear damping of the actor.

	**set_linear_damping** (actor, damping)
		Sets the linear damping of the actor.

	**angular_damping** (actor) : float
		Returns the angular damping of the actor.

	**set_angular_damping** (actor, rate)
		Sets the angular damping of the actor.

	**linear_velocity** (actor) : Vector3
		Returns the linear velocity of the actor.

	**set_linear_velocity** (actor, velocity)
		Sets the linear velocity of the actor.
		Note that this call only affects nonkinematic actors.

	**angular_velocity** (actor) : Vector3
		Returns the angular velocity of the actor.

	**set_angular_velocity** (actor, velocity)
		Sets the angular velocity of the actor.
		Note that this call only affects nonkinematic actors.

	**add_impulse** (actor, impulse)
		Adds a linear impulse (acting along the center of mass) to the actor.
		Note that this call only affects nonkinematic actors.

	**add_impulse_at** (actor, impulse, position)
		Adds a linear impulse (acting along the world position *pos*) to the actor.
		Note that this call only affects nonkinematic actors.

	**add_torque_impulse** (actor, impulse)
		Adds a torque impulse to the actor.

	**push** (actor, velocity, mass)
		Pushes the actor as if it was hit by a point object with the given *mass*
		travelling at the given *velocity*.
		Note that this call only affects nonkinematic actors.

	**push_at** (actor, velocity, mass, position)
		Like push() but applies the force at the world position *pos*.
		Note that this call only affects nonkinematic actors.

	**is_sleeping** (actor) : bool
		Returns whether the actor is sleeping.

	**wake_up** (actor)
		Wakes the actor up.

	**unit** (actor) : Unit
		Returns the unit that owns the actor or nil;

SoundWorld
===========

	**stop_all** (sound_world)
		Stops all the sounds in the world.

	**pause_all** (sound_world)
		Pauses all the sounds in the world

	**resume_all** (sound_world)
		Resumes all previously paused sounds in the world.

	**is_playing** (sound_world, id) : bool
		Returns wheter the sound *id* is playing.

ResourcePackage
================

	**load** (package)
		Loads all the resources in the package.
		Note that the resources are not immediately available after the call is made,
		instead, you have to poll for completion with has_loaded().

	**unload** (package)
		Unloads all the resources in the package.

	**flush** (package)
		Waits until the package has been loaded.

	**has_loaded** (package) : bool
		Returns whether the package has been loaded.

Device
======

	**platform** () : string
		Returns a string identifying what platform the engine is running on.

	**architecture** () : string
		Returns a string identifying what architecture the engine is running on.

	**version** () : string
		Returns a string identifying the engine version.

	**last_delta_time** () : float
		Returns the time in seconds needed to render the last frame

	**quit** ()
		Quits the application.

	**resolution** () : Table
		Returns the main window resolution.

	**create_world** () : World
		Creates a new world.

	**destroy_world** (world)
		Destroys the given *world*.

	**render_world** (world, camera)
		Renders the given *world* from the point of view of the given *camera*.

	**create_resource_package** (name) : ResourcePackage
		Returns the resource package with the given *package_name* name.

	**destroy_resource_package** (package)
		Destroy a previously created resource *package*.
		Note that to unload the resources loaded by the package, you have to call
		ResourcePackage.unload() first.

	**console_send** (table)
		Sends the given lua *table* to clients connected to the engine.
		Note that the current version only supports explicitly escaped strings as key/value pairs.

	**can_get** (type, name) : bool
		Returns whether the resource (type, name) is loaded.
		When resource autoload is enabled it always returns true.

	**enable_resource_autoload** (enable)
		Sets whether resources should be automatically loaded when accessed.

DebugLine
=========

	**add_line** (debug_line, start, end, color)
		Adds a line from *start* to *end* with the given *color*.

	**add_sphere** (debug_line, center, radius, color)
		Adds a sphere at *center* with the given *radius* and *color*.

	**add_obb** (debug_line, tm, extents, color)
		Adds an orientd bounding box. *tm* describes the position and orientation of
		the box. *extents* describes the size of the box along the axis.

	**clear** (debug_line)
		Clears all the lines.

	**commit** (debug_line)
		Sends the lines to renderer for drawing.

Input
=====

Keyboard
--------

	**modifier_pressed** (modifier) : bool
		Returns whether the specified *modifier* is pressed.

	**button_pressed** (button) : bool
		Returns whether the specified *b* button is pressed in the current frame.

	**button_released** (button) : bool
		Returns whether the specified *b* button is released in the current frame.

	**any_pressed** () : bool
		Returns wheter any button is pressed in the current frame.

	**any_released** () : bool
		Returns whether any button is released in the current frame.

Mouse
-----

	**button_pressed** (button) : bool
		Returns whether the *b* button is pressed in the current frame.

	**button_released** (button) : bool
		Returns whether the *b* button is released in the current frame.

	**any_pressed** () : bool
		Returns wheter any button is pressed in the current frame.

	**any_released** () : bool
		DReturns whether any button is released in the current frame.ef

	**cursor_xy** () : Vector2
		Returns the position of the cursor in window space.

	**set_cursor_xy** (position)
		Sets the position of the cursor in window space.

	**cursor_relative_xy** () : Vector2
		Returns the relative position of the cursor in window space.

	**set_cursor_relative_xy** (position)
		Sets the relative position of the cursor in window space.

	**wheel** () : float
		Returns the mouse wheel state in the current frame.
		A positive or negative value is returned when the wheel is up or down
		respectively, 0.0 otherwise.

Touch
-----

	**pointer_down** (pointer) : bool
		Returns whether the *p* pointer is pressed in the current frame.

	**pointer_up** (pointer) : bool
		Returns whether the *p* pointer is released in the current frame.

	**any_down** () : bool
		Returns wheter any pointer is pressed in the current frame.

	**any_up** () : bool
		Returns whether any pointer is released in the current frame.

	**pointer_xy** () : Vector2
		Returns the position of the pointer *p* in window space.

Window
======

	**show** ()
		Shows the window.

	**hide** ()
		Hides the window.

	**resize** (width, height)
		Resizes the window to *width* and *height*.

	**move** (x, y)
		Moves the window to *x* and *y*.

	**minimize** ()
		Minimizes the window.

	**restore** ()
		Restores the window.

	**is_resizable** () : bool
		Returns whether the window is resizable.

	**set_resizable** (resizable)
		Sets whether the window is resizable.

	**title** () : string
		Returns the title of the window.

	**set_title** (title)
		Sets the title of the window.