Learn to create a breathing animation using the sin() function and a time uniform (u_time), simulating a pulsating light effect.
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The sin() function oscillates between -1 and 1. To map this to [0, 1]:
`glsl
float brightness = 0.5 + 0.5 * sin(u_time);
`
This produces a smooth brightness variation over time.
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Use the brightness to drive RGB values:
`glsl
vec3 color = vec3(brightness, 0.6, 0.9);
`
Only the red channel changes in this example.
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Final output uses gl_FragColor:
`glsl
gl_FragColor = vec4(color, 1.0);
`
You can modify frequency, amplitude, or color mapping to personalize the effect.