[Sidefx-houdini-list] translucent backlit surface

Larry Giunta larry at gcreativestudios.com
Thu Mar 3 21:40:54 EST 2016


Founds my answer on the forum.
https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=147563 <https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=147563>


Thanks



> On Mar 3, 2016, at 4:56 PM, Larry Giunta <larry at gcreativestudios.com> wrote:
> 
> Hello all, 
> 
> I’ve used a technique in the past to create a backlit glass or plastic surface.
> Similar to the buttons on the old Simon game … or a lit traffic light or light table.
> 
> I was able to “reverse” a flat surface with the primitive SOP.
> 
> Then, in a regular mantra material node, I could simply pipe a “negate” node 
> into the “I” input of the “surfaceModel” node.
> 
> If I then placed a point light behind the surface I would get the backlit effect.
> 
> This still works for me if I go back to H13.
> 
> But in H14 or H15 I only get a solid black or dark grey surface.
> 
> I’m assuming something has changed within the basic operation of the shader or mantra.
> I’m hoping I can fairly easily recreate this effect in H15. But I’m coming up short so far.
> 
> If anyone has any suggestions I’d greatly appreciated the input.
> 
> Thanks, 
> 
> Larry
> 
>> Larry Giunta 
> Creative Director
> G Creative Studios
> (978)276-0600
> www.gcreativestudios.com
> 
> 
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