Hi,
As i understand it Houdini has some built in codes that you can access when you write
#include <library>

Is there a way to view what is included in a certain library. Specifically the

#include <voptype.h>

I keep seeing this one line of code:
VOPpoint pcP= v@P;

when the voptype.h library is included and was wondering what exactly does VOPpoint pcP mean?

Thanks!

You can find the include files in your houdini install directory/houdini/vex/include/voptype.h

There isn't much anything interesting in voptype.h, but voplib.h is already quite a bit more interesting.

VOPpoint pcP = v@P;

is simple means, create variables VOPimport and pcP that will be equal current Position from your run over (pts or prims, etc)

Moin,

to extend what Arthur already explained:

VOPpoint pcP= v@P;

creates a 3-parted-vector named pcP and assigns to it the current position (“current” meaning that the VEX code most likely is getting iterated over all positions available in the specific geometry context, be it points, vertices or primitives, depending on the node connection it has).

The “@” means that the “P” (the “P” after the “@” stands for “current position”) is a globally accessible variable, in Houdini speak you would pronounce it “attribute position” (@ for attribute, P for position).
The “v” before the “@” is a type-cast, it is to make sure that “pcP” gets a 3-component vector value (in the case of “P” that should be reliably so, but always putting the type before the variable seems to me like a good habit).

Marc
(no top, no middle, no nothing engineer, just starting with VEX and other crazies)

malbrecht
Moin,

to extend what Arthur already explained:

VOPpoint pcP= v@P;

creates a 3-parted-vector named pcP and assigns to it the current position (“current” meaning that the VEX code most likely is getting iterated over all positions available in the specific geometry context, be it points, vertices or primitives, depending on the node connection it has).

The “@” means that the “P” (the “P” after the “@” stands for “current position”) is a globally accessible variable, in Houdini speak you would pronounce it “attribute position” (@ for attribute, P for position).
The “v” before the “@” is a type-cast, it is to make sure that “pcP” gets a 3-component vector value (in the case of “P” that should be reliably so, but always putting the type before the variable seems to me like a good habit).

Marc
(no top, no middle, no nothing engineer, just starting with VEX and other crazies)

malbrecht, Great and clean explanation by the way