Barn doors on Spotlights?

Forums Houdini Indie and Apprentice Barn doors on Spotlights?

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Andy_23: Member; 918 posts; Joined: March 2014; Offline

July 15, 2014 9:42 a.m.

Hi,

I need to have barn doors on some spot lights to controll the lighting. Is this feature available in Houdini? Other than attaching geometry I can't seem to find it on the options or light shaders.

Thanks,

Andy


claudiohick: Member; 36 posts; Joined: May 2013; Offline

July 16, 2014 1:37 a.m.

Barn doors? I never seen this before, but Cone Angle in the spot light options doesn't mimic that?

You could also get inside the spotlight and add geometries there and control outside with new parameters in the interface.


Andy_23: Member; 918 posts; Joined: March 2014; Offline

July 16, 2014 3:05 a.m.

claudiohick
Barn doors? I never seen this before, but Cone Angle in the spot light options doesn't mimic that?

Yeah, barn doors like these. They've been around for ages in CG ;-)
https://support.solidangle.com/pages/viewpage.action?pageId=1081910 [support.solidangle.com]

claudiohick
You could also get inside the spotlight and add geometries there and control outside with new parameters in the interface.

Thanks, I'll dig into it and see what I can come up with. But the point of a barn door shader on lights is not to use objects to cast shadows, as shadow rays are expensive.


Andy_23: Member; 918 posts; Joined: March 2014; Offline

July 16, 2014 7:51 a.m.

I could really use some help here! :-)


mark: Staff; 2673 posts; Joined: July 2005; Offline

July 16, 2014 9:15 a.m.

Andy58
I could really use some help here! :-)

I think the closest you can get is to use a projector image map. You can use this for gels too.

Attachments:
hex.zip (80.6 KB)


cgcris: Member; 67 posts; Joined: May 2014; Offline

July 16, 2014 9:48 a.m.

what about using a light IES profile? Jordi shows how to use them on the Softimage > Houdini guides lightining chapter.


Andy_23: Member; 918 posts; Joined: March 2014; Offline

July 16, 2014 10:57 a.m.

Thanks guys,

I already use an IES profile, but the light projector might work. Using barn doors however allows for fine control over the light distribution without painting and repainting the projector map.

I guess it's time for an RFE ;-)

Thanks again.


anon_user_37409885: Member; 4189 posts; Joined: June 2012; Offline

July 16, 2014 3:50 p.m.

Cops will give you some easy control - looks like you hit re-render for IPR though.

Attachments:
hexCops.hipnc (131.9 KB)
cops.png (145.1 KB)


Andy_23: Member; 918 posts; Joined: March 2014; Offline

July 16, 2014 4:12 p.m.

Thank you Marty. Of course! The COP way works as well. Much appreciated.
Andy

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