HLSL Question - Random numbers?

Graphics and GPU Programming Programming

Started by GroZZleR August 13, 2005 04:00 PM

2 comments, last by sirob 18 years, 8 months ago

820

Author

August 13, 2005 04:00 PM

Hey all, Just a quickie here: Is it possible to generate a random number inside a shader? I can't seem to find any intrinsic function to do this and I obviously can't set an outside value because that'll set it for the entire pass and not on a per vertex / pixel value. Thanks.

dave

2,188

August 13, 2005 04:02 PM

No.

You would have to generate one outside and pass it in.

ace

Illco

928

August 13, 2005 04:43 PM

Quote:
I obviously can't set an outside value because that'll set it for the entire pass and not on a per vertex / pixel value.

You could (obviously :-) sent an array of outside values.

Furthermore, a small RNG is not so hard to write so might as well include one in your HLSL file.

Greetz,

Illco

sirob

1,181

August 13, 2005 06:14 PM

You could also use a texture with random values if this is for a pixelshader or VS3.0 and up.

Sirob Yes.» - status: Work-O-Rama.

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HLSL Question - Random numbers?

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