Spotlight Projection Map to mimic movie projector

[dpap]

How can I avoid the round clipping that occurs when I'm projecting an image through a spotlight?

In other words how can make the the spotlight project a rectangular image without dark corners ?

Thanks in advance.

spotlight projection map.hip

[Skybar]

Scale the texture down in COPs so it fits inside the circle . Then just adjust the light as needed.

spotlight_projection_map_dv.hipnc

[dpap]

Thank you David for your help! That's a neat solution!

It's so cool that in Houdini, you can see the projection image in the viewport . In Maya you have to render in order to see what you are doing...

 

Edit : In  the viewport it's working fine but when I render I get this

 

mantra: Unable to load texture 'op:/../cop2net1/OUT'

 

and the light renders pink!

 

Any idea of whats going wrong?

Edited May 19, 2015 by dpap

[michael]

pink means that Houdini/mantra can't find the texture - check the path - maybe make it a full path instead of relative....

[dpap]

Thanks Michael! 

 

Using "op:/obj/cop2net1/OUT" fixed it. Kinda strange but it works now

[Skybar]

Yeah kinda strange the relative path works in the viewport but not render. Cool that it works now though

[Mandrake0]

also thinking it's strange that op: cant use relative paths but hey it's in the docs: http://www.sidefx.com/docs/houdini14.0/io/op_syntax :-)