Hi,

In my main loop I check the average frame rate of my animation and based on this, I skip 1, 2 or 3 frames each 5 frames.

The code how I do this is shown below, but I can't imagine that there isn't an easier way to code this. Any suggestions?

(Ps.: it's all based on a animation recorded for 50 fps)

				frameTime = _timer.GetFrameTime();
				lastFramesTime += frameTime;
				++framesPassed;
				++fiveFramesPassed;
				
				if(framesPassed == 50)
				{
					avgFrame = lastFramesTime / 50;
					framesPassed = 0;
					lastFramesTime = 0;
					frameSkip = 0;

					if(avgFrame < 20.0f) frameSkip = 0;
					if(avgFrame > 20.0f && avgFrame < 25.0f) frameSkip = 1;
					if(avgFrame > 25.0f && avgFrame < 33.3f) frameSkip = 2;
					if(avgFrame > 33.3f && avgFrame < 50.0f) frameSkip = 3;
					SetWindowTextA(_d3d.GetHwnd(), _timer.mStrFramerate);
				}
				frameInterval = 1;

				switch(fiveFramesPassed)
				{		
					case 3:
					{
						if(frameSkip == 3) frameInterval = 2;
					}
					break;
					
					case 4:
					{
						if(frameSkip == 2) frameInterval = 2;
						if(frameSkip == 3) frameInterval = 2;

					}
					break;

					case 5:
					{
						if(frameSkip == 1) frameInterval = 2;
						if(frameSkip == 2) frameInterval = 2;
						if(frameSkip == 3) frameInterval = 2;
						fiveFramesPassed = 0;
					}
					break;
				}


// code of running the animation, later on:

					if(!_scene.mCamAnimation.NextFrame(frameInterval))
					{
						active = false;
						PostMessage(_d3d.GetHwnd(), WM_QUIT, 0, 0);
					}

What special need do you have for approaching the task in this manner?

Why don’t you just calculate the current frame to render based on how much time has passed?

If it’s 50 frames-per-second and you are 0.2 seconds into the animation, display frame number 10.

Madhed just posted the math for it.

L. Spiro

Thanks. I fully understand, was just wondering what would be best.

The reason is that some frames have an identifier when a specific 'script' needs to be run in the animation.

I've solved it a few minutes ago using option 1. And within my "SetCurrentFrame" option of my animation class, I save the 'last rendered' frame and check if within the frames in between the script identifier was not 0, and if so, I set the script identifier to the new Currentframe. Works great (in worst cases the script starts 3 frames later @20fps then @60fps, no noticable difference

Thanks for the help.

Just to be sure I understand it correct, an example.

What frame would it be when I ran 60fps constant, after 2 minutes?

120.000 frames in total animation

0.016 seconds per frame (60fps)

120 seconds past

nextFrame = (120 / 0.016 = 7.200) % 120.000

nextFrame = 7200 % 120.000

(7.200 / 120.000 = 0.06 * 120.000)

nextFrame = 4800

There are indeed 120.000 frames. The 0.06 is 7200 / 120.000 (to find out indeed how modulus calculated the right frame :))

I can't tell when you're using a decimal point as separating thousands and when you're using it for fractional values.

He is from Europe and is using it as a comma.

nextFrame = 7200 % 120.000
(7.200 / 120.000 = 0.06 * 120.000)
nextFrame = 4800

7,200 % 120,000 = 7,200.

% operator doesn’t overflow until the left side is actually larger than the right side.

7,200 % 120,000 == 7,200 - ((int)(7,200 / 120,000) * 120,000) == 7,200.

L. Spiro