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  1. OpenGL OpenGL Fade In/Out Effect

    I made a fade in/out for a simple polygon that fades in and out, because of the variation of the Z coordinate of that polygon. #version 330 core in vec4 fragColor; out vec4 finalColor; in float zPos; void main() { vec4 color = fragColor; float partA = -1.0 * zPos; float partB = partA - 7.0; color.a = 1.0 - partB; finalColor = color; } zPos is always negative in my case, so in partA I make it a positive value, then in partB I decrease it by 7. The value in partB is used to get alpha value for the color of the polygon.   The initial value of zPos is -8.0, then it increases to -7.0. This is a fade in. Then the zPos from value -7.0 dereases again to -8.0. This way i get a fade out.   http://www.youtube.com/watch?v=o1PYnmTaWWs   In this video a recorded the game that uses this fragment shader for fading in/out the squares that are in background.   Hope this will help you to write the right shader for your problem. :)   P.S. Sorry for my english, if i made any mistakes.