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edit approved Dec 14, 2017 at 3:52

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All you need to do is clamp your time value, so that it holds a constant value after it's gone through the desired number of iterations.

// Constants to declare elsewhere.
float maxCycles#define =TWOPI 16.0f;28318530718
float twoPi = (3.14159265358979323846f#define *maxCycles 21.0f);

// These lines go inside your mainImage shader.
float phase = (iTime - startTime)/twoPi;TWOPI;
phase = min(phase, maxCycles);
float factor = .5 * sin(twoPiTWOPI * phase);

This effectively stops time after the desired number of cycles of the sine function.

Note that you'll need to provide a startTime so it knows when the pinch began. You can use a float uniform for this and set it once at the beginning of the effect.

All you need to do is clamp your time value, so that it holds a constant value after it's gone through the desired number of iterations.

// Constants to declare elsewhere.
float maxCycles = 1.0f;
float twoPi = (3.14159265358979323846f * 2.0f);

// These lines go inside your mainImage shader.
float phase = (iTime - startTime)/twoPi;
phase = min(phase, maxCycles);
float factor = .5 * sin(twoPi * phase);

This effectively stops time after the desired number of cycles of the sine function.

Note that you'll need to provide a startTime so it knows when the pinch began. You can use a float uniform for this and set it once at the beginning of the effect.

All you need to do is clamp your time value, so that it holds a constant value after it's gone through the desired number of iterations.

// Constants to declare elsewhere.
#define TWOPI 6.28318530718
#define maxCycles 1.0f

// These lines go inside your mainImage shader.
float phase = (iTime - startTime)/TWOPI;
phase = min(phase, maxCycles);
float factor = .5 * sin(TWOPI * phase);

This effectively stops time after the desired number of cycles of the sine function.

Note that you'll need to provide a startTime so it knows when the pinch began. You can use a float uniform for this and set it once at the beginning of the effect.

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created Dec 14, 2017 at 1:05

DMGregory ♦

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All you need to do is clamp your time value, so that it holds a constant value after it's gone through the desired number of iterations.

// Constants to declare elsewhere.
float maxCycles = 1.0f;
float twoPi = (3.14159265358979323846f * 2.0f);

// These lines go inside your mainImage shader.
float phase = (iTime - startTime)/twoPi;
phase = min(phase, maxCycles);
float factor = .5 * sin(twoPi * phase);

This effectively stops time after the desired number of cycles of the sine function.

Note that you'll need to provide a startTime so it knows when the pinch began. You can use a float uniform for this and set it once at the beginning of the effect.