mental ray noise functions

[aanton]

Hi there,

I need to use the mental ray noise functions for an animated geometry shader, however, each time the shader is called, a different noise function is generated. I tried to seed the random numbers generator with a certain value, but it makes no difference. I've tried all possible noise functions:
mi_noise_1d
mi_noise_2d
mi_noise_3d
and also the uniform noise functions. All functions look different each time the shader is run.
Is this a bug or is there some way to "lock" the noise function, so it is the same, each call.

Here is the code I am using:

#include <stdio.h>
#include <stdlib.h>
#include <shader.h>

DLLEXPORT int mynoise_version(void) { return(1); }
DLLEXPORT miBoolean mynoise(
	miTag		*result,
	miState		*state,
	test_t		*paras)
{
	int z;

	for (z = 0; z < 100; z++)	
		printf("noise(%i): %f",z,mi_noise_1d(z));


	return miTRUE;

}

The output will be different each time the scene is rendered.

Thank you very much in advance,
Anton

[haggi]

Thats really strange.
I just tried the same with exactly the same result every time the shader is called. The only difference I can see it that I dont use a printf but a mi_info(). Even with your print function, it is exactly the same every time.

[aanton]

Hmm... what mental ray version are you using? I tried the two latest ones, same problem.

[haggi]

I only tried the mr version in maya2008 what means mentalray 3.6

[aanton]

Hi,

indeed you are right! I tried mental ray version 3.6, works fine! With the 3.7 version the noise function produces a different result each time.
Thanks!

[haggi]

I just tried it with mr 3.7 and maya2009: Every call gives back exactly the same result, every time.

[MasterZap]

This shouldn't be. But mi_noies_1d wants a float, not an integer.... dunno if that matters... but for a given input, yes, the noise functions should retun a given output, no change.

/Z

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