IMG3D_TextureEval question

[hoknamahn]

Hello guys,

I'm confused by IMG3D evaluator function. Could you explain how such evaluator should work?

I see two definitions:

00041 typedef void	(*IMG3D_TextureEval)(int nvalues,
00042						 const UT_Vector3 *pos,
00043						 fpreal32 *result[],
00044						 const char *names[],
00045						 int sizes[],
00046						 int for_aa);

and

00048 typedef void	(*IMG3D_Manager_Eval)(int nvalues,
00049						 const fpreal32 *pos,
00050						 fpreal32 *result[],
00051						 const char *names[],
00052						 int sizes[],
00053						 int for_aa);

1. What for we have two different types of evaluators?

2. nvalues = xres * yres * zres?

3. Do we pass pos into evaluator as position in current step?

4. Why do we need to pass nvalues?

5. Still not sure what has to have result array... it's type is array of pointers on fpreal32. But our channels can be any type?

6. What cons and pros of using of such evaluator and fillUntiledTexture()? Is it only difference between creation of tiled / untiled texture?

Edited June 22, 2008 by hoknamahn