Output Variables VEX node

Every VOP network requires one of these.

See also: Global Variables, Parameter, Subnet Output

Every VOP network requires one of these.

This operator provides inputs that represent all the global variables for the current VOP network type that can be modified. There are no parameters and no outputs to this operator. Every VOP network contains exactly one of this operator type. The Output Variables operator cannot be deleted except by deleting the parent VOP network. It is also not possible to create a second Output Variables operator within a VOP network (even within a subnet).

This operator drives the VEX code generation process for a VOP network. When generating code, only operators that are directly or indirectly connected to an input of the Output Variables operator will actually generate any code. This operator is also always the last operator to output its code. It simply goes through all of its inputs, and sets the global variable corresponding to each connected input to the value that is wired into it.

The variables available from this operator will be a subset of the variables available as outputs from the Global Variables operator. The difference between these two operators is that the Output Variables operator only provides inputs for those global variables that can be changed.

Every VOP network type has a set of global variables associated with it. These are the variables inherent to the VEX context that the VOP network operates in. For shading contexts (such as Surface and Displacement) these will be variables like the position of the point on the geometry being shaded (P), or the normal of the surface at the point being shaded (N). For Sop or Pop Operator networks, these variables include the position of the point being manipulated (P), and the point number of the point being manipulated (ptnum).