how do i even out the camera speed with the fps?

[wREAKAILDRON]

i want to know how to make the camera move at the same speed no matter what fps my game runs at.
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Love advice dicussion

[Saturn]

Scale all movement with the time returned by Irrlicht's timer minus the time returned last frame. This way you know how long the frame needed to render and can scale movements accordingly.

[wREAKAILDRON]

i wanted to erase this and post another question now, i did it a different way too and got a smooth result. should i give the answer? ?
i did it by dividing the frame rate by 1 and multiplying it by either 100 or 1000, and now the camera moves at the same speed for different framerates.
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UNIVERSAL HEALTH WAREHOUSE

[agi_shi]

i wanted to erase this and post another question now, i did it a different way too and got a smooth result. should i give the answer? ?
i did it by dividing the frame rate by 1 and multiplying it by either 100 or 1000, and now the camera moves at the same speed for different framerates.

That's the same thing. All you did was get the delta from the frame rate instead of from the ... well, original delta.

For example, 60 fps:
1 / 60 = 0.016 seconds per frame (your delta)
You must've multiplied it by 1000 because it's kinda small and unnoticeable (move from seconds to kiloseconds or so).

[TomiZ]

This isn't good solution.

This is code from CFPSCounter.cpp:

Code: Select all

//! to be called every frame
void CFPSCounter::registerFrame(u32 now, u32 primitivesDrawn )
{
	++FramesCounted;
	PrimitiveTotal += primitivesDrawn;
	PrimitivesCounted += primitivesDrawn;
	Primitive = primitivesDrawn;

	const u32 milliseconds = now - StartTime;

	if (milliseconds >= 1500 )
	{
		const f32 invMilli = core::reciprocal ( (f32) milliseconds );
		
		FPS = core::ceil32 ( ( 1000 * FramesCounted ) * invMilli );
		PrimitiveAverage = core::ceil32 ( ( 1000 * PrimitivesCounted ) * invMilli );

		FramesCounted = 0;
		PrimitivesCounted = 0;
		StartTime = now;
	}
}

As you can see fps is update only one time in 1500ms. So you camera can "jump" if framerate will change for short time. For example you can get 30 fps when player is looking at fire for 10 second, and 60 when he tourn around, but for first 1500ms camera can move faster.

You should always check time each frame.

[MasterGod]

TomiZ, you mean to do it like Saturn said?

Scale all movement with the time returned by Irrlicht's timer minus the time returned last frame. This way you know how long the frame needed to render and can scale movements accordingly.