Explosion/Implosion pixel shader code in GLSL:
uniform sampler2D tex;
void main()
{
vec2 cen = vec2(0.5,0.5) - gl_TexCoord[0].xy;
vec2 mcen = - // delete minus for implosion effect
0.07*log(length(cen))*normalize(cen);
gl_FragColor = texture2D(tex, gl_TexCoord[0].xy+mcen);
}
By applying this filter to image below
we get such explosion effect
and such implosion effect
Hi,
ReplyDeleteI want to achieve a similar effect of implosion but linear. So what i want is to cut the center part of image and, join the both halfs without any sharp cut. I am able to cut the center part by below logic, but how to achieve a smooth merge, between them, is what i am wondering , right now there is a sharp cut. Something like edge blending, by blurring both halfs?
Would appreciate your help. Below code achieves the cut of centre part.
vec4 CurrentColor = texture2D(videoFrame, textureCoordinate.xy);
if(textureCoordinate.y < 0.5){
CurrentColor = texture2D(videoFrame,vec2(textureCoordinate.x,(textureCoordinate.y-0.125)));
}
else{
CurrentColor = texture2D(videoFrame,vec2(textureCoordinate.x,(textureCoordinate.y+0.125)));
}
gl_FragColor = CurrentColor;
Please define the "smooth merge". Only YOU know how center pixels should look like ...
ReplyDelete