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supersampling a raytracer

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Hi I want to do 4x supersampling to my raytracer.can some one help me doing this.Please. I am a newbie.Thanks in advance.

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one of the methods is to shoot extra rays between the standard rays you shoot.

for (y =0; y < height * 2; y++)
for (x = 0; x < width * 2; x++)
pixel[(x / 2) + (y/2) * width] = RenderRay((float)x / 2, (float)y / 2);

this way you will cast 4x the rays you normally do at a regular grid-interval.

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