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Util = require( "utillib" )
Vec2 = require( "vector2" )
Vec3 = require( "vector3" )
Camera3D = {}
Camera3D.meta = {
__index = Camera3D,
}
Camera3D.MODES = {
CUSTOM = 0,
FREE = 1,
FIRST_PERSON = 2,
ORBITAL = 3,
}
Camera3D.KEYS = {
FORWARD = RL.KEY_W,
BACKWARD = RL.KEY_S,
RIGHT = RL.KEY_D,
LEFT = RL.KEY_A,
PAN = RL.KEY_LEFT_SHIFT,
FAST = RL.KEY_LEFT_SHIFT,
}
Camera3D.MOUSE_MOVE_SPEED = 0.5
Camera3D.KEYBOARD_MOVE_SPEED = 10
Camera3D.KEYBOARD_MOVE_SPEED_MULTI = 3
Camera3D.TURN_SPEED = 0.15
Camera3D.ORBITAL_SPEED = 0.5
Camera3D.ZOOM_AMOUNT = 0.1
function Camera3D:new()
local object = setmetatable( {}, Camera3D.meta )
object.camera = RL.CreateCamera3D()
object.mode = object.MODES.CUSTOM
object:setPosition( { 0, 0, 0 } )
object:setTarget( { 0, 0, 0 } )
object:setUp( { 0, 1, 0 } )
return object
end
function Camera3D:setPosition( pos )
RL.SetCamera3DPosition( self.camera, pos )
end
function Camera3D:setTarget( target )
RL.SetCamera3DTarget( self.camera, target )
end
function Camera3D:setUp( up )
RL.SetCamera3DUp( self.camera, up )
end
function Camera3D:setFoyv( foyv )
RL.SetCamera3DFovy( self.camera, foyv )
end
function Camera3D:setProjection( projection )
RL.SetCamera3DProjection( self.camera, projection )
end
function Camera3D:getPosition()
return Vec3:new( RL.GetCamera3DPosition( self.camera ) )
end
function Camera3D:getTarget()
return Vec3:new( RL.GetCamera3DTarget( self.camera ) )
end
function Camera3D:getUp()
return Vec3:new( RL.GetCamera3DUp( self.camera ) )
end
function Camera3D:getFoyv()
return RL.GetCamera3DFovy( self.camera )
end
function Camera3D:getProjection()
return RL.GetCamera3DProjection( self.camera )
end
--- Returns the cameras forward vector ( normalized )
function Camera3D:getForward()
return Vec3:new( RL.GetCamera3DForward( self.camera ) )
end
--- Returns the cameras up vector ( normalized ) Note: The up vector might not be perpendicular to the forward vector
function Camera3D:getUpward()
return Vec3:new( RL.GetCamera3DUpNormalized( self.camera ) )
end
function Camera3D:process( delta )
if self.mode == self.MODES.FREE then
if RL.IsMouseButtonDown( RL.MOUSE_BUTTON_MIDDLE ) then
local mouseDelta = Vec2:new( RL.GetMouseDelta() )
if RL.IsKeyDown( self.KEYS.PAN ) then
mouseDelta = mouseDelta:scale( self.MOUSE_MOVE_SPEED * delta )
local forward = RL.GetCamera3DForward( self.camera )[2]
RL.Camera3DMoveRight( self.camera, -mouseDelta.x, true )
RL.Camera3DMoveUp( self.camera, mouseDelta.y * -( ( 1 - math.abs( forward ) ) * Util.sign( forward ) ) )
RL.Camera3DMoveForward( self.camera, mouseDelta.y * math.abs( forward ), true )
else
mouseDelta = mouseDelta:scale( self.TURN_SPEED * delta )
RL.Camera3DYaw( self.camera, -mouseDelta.x, true )
RL.Camera3DPitch( self.camera, -mouseDelta.y, false, true, false )
end
end
local mouseScroll = RL.GetMouseWheelMove()
if mouseScroll ~= 0 then
RL.Camera3DMoveToTarget( self.camera, self.ZOOM_AMOUNT * self:getTargetDistance() * -mouseScroll )
end
elseif self.mode == self.MODES.FIRST_PERSON then
local mouseDelta = Vec2:new( RL.GetMouseDelta() )
mouseDelta = mouseDelta:scale( self.TURN_SPEED * delta )
RL.Camera3DYaw( self.camera, -mouseDelta.x, false )
RL.Camera3DPitch( self.camera, -mouseDelta.y, false, false, false )
RL.SetMousePosition( Vec2:new( RL.GetScreenSize() ):scale( 0.5 ) )
local distance = self.KEYBOARD_MOVE_SPEED * delta
if RL.IsKeyDown( self.KEYS.FAST ) then
distance = distance * self.KEYBOARD_MOVE_SPEED_MULTI
end
if RL.IsKeyDown( self.KEYS.FORWARD ) then
RL.Camera3DMoveForward( self.camera, distance, false )
elseif RL.IsKeyDown( self.KEYS.BACKWARD ) then
RL.Camera3DMoveForward( self.camera, -distance, false )
end
if RL.IsKeyDown( self.KEYS.RIGHT ) then
RL.Camera3DMoveRight( self.camera, distance, false )
elseif RL.IsKeyDown( self.KEYS.LEFT ) then
RL.Camera3DMoveRight( self.camera, -distance, false )
end
elseif self.mode == self.MODES.ORBITAL then
RL.Camera3DYaw( self.camera, self.ORBITAL_SPEED * delta, true )
end
end
--- Draw camera target.
function Camera3D:draw()
local targetPos = self:getTarget()
RL.DrawLine3D( targetPos + Vec3:new( -0.5, 0, 0 ), targetPos + Vec3:new( 0.5, 0, 0 ), RL.GREEN )
RL.DrawLine3D( targetPos + Vec3:new( 0, -0.5, 0 ), targetPos + Vec3:new( 0, 0.5, 0 ), RL.BLUE )
RL.DrawLine3D( targetPos + Vec3:new( 0, 0, -0.5 ), targetPos + Vec3:new( 0, 0, 0.5 ), RL.RED )
end
function Camera3D:getTargetDistance()
return RL.Vector3Distance( self:getPosition(), self:getTarget() )
end
function Camera3D:beginMode3D()
RL.BeginMode3D( self.camera )
end
function Camera3D:endMode3D()
RL.EndMode3D()
end
return Camera3D
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