question about iitter code

[shadercoder]

Hi
about this code for sampling blue noise texture..
float2 jitter = tex2Dlod(_Noise, float4((uv + random) * _RayCastSize.xy / 256, 0, -255));

what is the LOD of -255 value? i only know this should be range from 0 to MaxMipmaplevel(float point)

thanks
peter

[Xerxes1138]

Hey,

This is just to prevent the shader to sample any mipmap, it's just a safety check :).

Cheers

[shadercoder]

Hi
thank you
well, is this standard way to access the blue noise texture(i mean the texture coordinate part) or just up to you?

peter

[Xerxes1138]

Hey,

I think it's pretty standard way excepth the -255 maybe, but the screenUV * screenSize / sampleTextureSize part is common. About the random part it's kind of an hack I made, it would be better I think to use an animated texture with 16 slice, maybe more. Sometimes the noise get sampled at the same position on screen which is not good for temporal.

Cheers

[shadercoder]

Hi thanks for your reply. too late to see the reply.