Class TFramesPerSecond

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Constructor of this class is internal, you should not create instance of TFramesPerSecond class yourself. Only use the already-created instance in TCastleContainer.Fps.

Display current FPS (RealFps, OnlyRenderFps, taking into account WasSleeping).

Forces SecondsPassed for the next "update" call to be zero.

This is useful if you just came back from some modal state, like a modal dialog box (like TCastleWindow.FileDialog or modal boxes in CastleMessages – they already call this method). SecondsPassed could be ridicoulously long in such case (if our message loop is totally paused, as in TCastleWindow.FileDialog on Windows) or not relevant (if we do our message loop, but we display something entirely different, like CastleMessages). So it's best to pretend that SecondsPassed is 0.0, so things such as TCastleSceneCore.Time do not advance wildly just because we did a modal dialog.

This forces the SecondsPassed to be zero at the next update event (InternalUpdateBegin).

Current frame identifier.

Changed when each container "update" event occurs, so this is equal during all TCastleUserInterface.Update, TCastleUserInterface.Render, TCastleTransform.Update, TCastleTransform.LocalRender occuring within the same frame. You can use this to avoid performing the same job many times in a single frame.

Never zero.

It's a class function, so you can access it like TFramesPerSecond.FrameId, no need to have a TFramesPerSecond instance (which is usually accessed from TCastleContainer, like TCastleContainer.Fps, TCastleWindow.Fps, TCastleControl.Fps.

Frame identifier within which last render started.

This is usually equal to FrameId or FrameId - 1 (depending on the order, whether Update or Render happens first, which may be platform-dependent). Though if you disabled TCastleWindow.AutoRedisplay, it may be something even smaller than FrameId - 1.

Never zero. (This allows to easily treat "frame id = zero" as "frame id that never happened" in some logic.)

Rendering speed, measured in frames per second, but accounting only time spent inside "render" calls (thus ignoring time spent on physics and other logic).

This measures only time spend in TCastleContainer.EventRender method (and it's subordinates, like TCastleUserInterface.Render, TCastleScene.LocalRender, TCastleWindow.OnRender). It does not take into account time spent on other activities, like "update" calls, and it doesn't take into account that frames are possibly not rendered all the time (when AutoRedisplay = False).

See https://castle-engine.io/manual_optimization.php#section_fps for a detailed description what FPS mean and how they should be interpreted.

See also

RealFps

How many frames per second were actually rendered.

Warning: this symbol is deprecated: use OnlyRenderFps

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How many frames per second were actually rendered. This is the number of TCastleContainer.EventRender calls that actually happened within a real second of time. So it's an actual speed of your program. Anything can slow this down, not only long rendering, but also slow processing of other events (like "update" that does physics).

When TCastleWindow.AutoRedisplay or TCastleControl.AutoRedisplay is False, this may be very low, since we may not render the frames all the time (we may sleep for some time, or perform updates without rendering). In this case, the RealFps value may be confusing and useless (it does not reflect the speed of your application). Use the WasSleeping to detect this, and potentially hide the display of RealFps from user.

See https://castle-engine.io/manual_optimization.php#section_fps for a detailed description what FPS mean and how they should be interpreted.

See also

OnlyRenderFps

Rendering speed, measured in frames per second, but accounting only time spent inside "render" calls (thus ignoring time spent on physics and other logic).

Warning: this symbol is deprecated: use RealFps

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Some of the frames were not rendered, because the scene and camera were not moving. This happens only when TCastleWindow.AutoRedisplay or TCastleControl.AutoRedisplay are False, and it basically indicates that the RealFps value is not a useful indicator of your application speed.

See https://castle-engine.io/manual_optimization.php#section_fps for a detailed description what this means.

How much time passed since the last "update". You should use this inside "update" events and methods (TCastleContainer.EventUpdate, TCastleUserInterface.Update, TCastleTransform.Update...) to scale the movement. This way, your animation will work with the same speed (objects will travel at the same speed), regardless of the system performance (regardless of how often the "update" event occurs).

This is calculated as a time between start of previous "update" event and start of current "update" event.

Warning: this symbol is deprecated: use SecondsPassed

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Limit the SecondsPassed variable, to avoid increasing time in game a lot when a game was hanging or otherwise waiting for some exceptional event from OS. Used only when non-zero. By default it's DefaultMaxSensibleSecondsPassed.

Time of last Update call.