[Sidefx-houdini-list] "Parameter" VOP : "Use Input Value If Parameter Not Bound"

guillaume laforge guillaume.laforge.3d at gmail.com
Sat Nov 17 11:44:15 EST 2007

Sorry I can't reproduce your problem. Can you send a sample file ?


On Nov 17, 2007 2:40 PM, Oodini <svdbg at free.fr> wrote:

> Hello,
> guillaume laforge a écrit :
> > If your operator get a geometry attribute with the same name than one of
> its
> > parameters, this parameter is 'bound' or 'overriden' by the geometry
> > attribute value.
> > In a vop sop, "use input val if param not bound" just give you an input
> in
> > the parameter in order to replace its slider(s) or color value by the
> input
> > one. Nothing more.
> Actually, I have an alpha parameter set in my SOP network.
> If I don't check this parameter, I have a slider for alpha in the VEX
> SHOP parameters. If I leave it at 1, the alpha value I get is the one
> set in the SOP. But if I set this slider at 0, the rendering is
> transparent. So it is evalueated even if the alpha is bound. It is
> multiplied with the SOP alpha.
> If I check "Use Input Value If  Parameter Not Bound", the alpha control
> doesn't appear anymore in the VEX SHOP parameters. But its value (set in
> the Parameter VEX Node as default value) is still evaluated and
> multiplied by the SOP alpha value.
> The only effect of this checkbox sems to be make appear the control
> among the VEX SHOP parameters.
> Same effect with the "Invisible" checkbox...
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