Elapsed time and Sin

Graphics and GPU Programming Programming

0 comments, last by Hodgman 10 years, 5 months ago

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October 22, 2013 03:54 AM

Hello, in this OpenTK application why can you get the perfect scale with Math.PI?


time = (time >= Math.PI) ? 0.0 : time + e.Time;
variableScale = (float)(Math.Sin(time));

I know that Sin works best for 0..360 circle degrees range, but Math.PI related to time is strange.

If you have any references about and links to share please post here. Thanks.

52,717

October 22, 2013 04:02 AM

Sin completes a full cycle from 0 to 360 degrees, but the sin function in computer APIs very rarely accepts degrees.

Usually we work with radians: 2*Pi radians == 360 degrees.

The equivalent of that code, working with degrees instead of radians would be:

time = (time >= 180) ? 0.0 : time + e.Time;

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