Difference Between Gu_ And Gd_

[davedjohnson]

So what is the difference between a GU_PrimPoly and a GD_PrimPoly?

They both seem to have similar attributes, but sometimes you can use one and not the other (it seems).

And what does the GU_ and GD_ mean? I've deduced that GB_ means Geometry Base Class, is that right?

Could GU_ mean Geometry Utility and GD_ means Geometry Detail? And if so, what does that mean?

Dave

[ivan]

I believe you are correct, Geo Detail and Geo Utility,

the GU libraries perform operations on the prims,

the GD libraries handle queries about the details of the geometry and saving/loading stuff.

GD polys inherit from GD_face which inherits from GD_primitive which inherits from GB_primitive, which inherits from GB_element, etc...

GU polys inherit from the GEO prim branch (which leads to the GB branch) and the GU_primitive...

Kinda a vague split, I think I've gotten used to it more than fully comprehending the difference.

So what is the difference between a GU_PrimPoly and a GD_PrimPoly?

They both seem to have similar attributes, but sometimes you can use one and not the other (it seems).

And what does the GU_ and GD_ mean? I've deduced that GB_ means Geometry Base Class, is that right?

Could GU_ mean Geometry Utility and GD_ means Geometry Detail? And if so, what does that mean?

Dave

19669[/snapback]

[davedjohnson]

So, would doing a GD_PrimPoly::build() or a GU_PrimPoly::build() make more sense if I want to build polys out of existing points?

Dave

[George]

So, would doing a GD_PrimPoly::build() or a GU_PrimPoly::build() make more sense if I want to build polys out of existing points?

Dave

19672[/snapback]

You almost certainly want to use GU_PrimPoly. GD is the geometry domain library -- it is used for pasted surfaces where the detail lives on some specific domain (a NURBS surface for example).

George.

[davedjohnson]

Ah, see? This is where the magic decoder ring would really come in handy. Geometry Domain Library. So it's not the geometry detail library.

BTW, I did figure out how to create the polys without adding new points. There's another argument at the end of the build() that defaults to 1--if you set it to 0 then it doesn't append the points. You then set the pointer of each vertice to an existing GEO_Point* and voila you're there.

I'll post a snippet in a little while.

Dave